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Sample records for charmed meson resonances

  1. Nonperturbative scalar-meson resonances with open charm and beauty

    CERN Document Server

    Van Beveren, E; Beveren, Eef van; Rupp, George

    2003-01-01

    We predict several new bound states and resonances for B-pion, B-Kaon, and B-D S-wave elastic scattering, within the same model which was recently employed to explain the D*sJ(2317)+ meson. In the charm-nonstrange sector we find a (virtual ?) bound state close to the B-pion threshold, and moreover two nearby resonances of comparable width in the range 5.9 to 6.1 GeV. We obtain bound states B*s0(5570) in b-sbar and B*c0(6490) in bbar-c, as well as resonances at higher energies. No JP=0+ states are found at 5.6 GeV (in bbar-u/d), at 5.7 GeV (in b-sbar), or at 6.1 GeV (in bbar-c), where they are predicted from pure confinement.

  2. Charmed mesons in nuclear matter

    CERN Document Server

    Tolos, L; Garcia-Recio, C; Oset, E; Molina, R; Nieves, J; Ramos, A

    2010-01-01

    We obtain the properties of charmed mesons in dense matter using a coupled-channel approach which accounts for Pauli blocking effects and meson self-energies in a self-consistent manner. We study the behaviour of dynamically-generated baryonic resonances together with the open-charm meson spectral functions in this dense nuclear environment. We discuss the implications of the in-medium properties of open-charm mesons on the $D_{s0}(2317)$ and the predicted X(3700) scalar resonances, and on the formation of $D$-mesic nuclei.

  3. From the ψ to charmed mesons

    International Nuclear Information System (INIS)

    This talk deals with the author's recollections about the discoveries of the J/ψ the ψ' as well as psion spectroscopy and charmed mesons. He gives a chronology for the ψ and ψ' discoveries. He also discusses the events which led to the charmed meson discovery as well as detailed discussions on the proof that the resonance observed in the K- π+ system, at 1,865 MeV, was indeed the predicted charmed meson

  4. Theoretical update on two non-resonant three-body channels in charmed meson decays

    CERN Document Server

    Zhang, D X

    1996-01-01

    Predictions of two channels in the three-bod decays of the charmed mesons are made within the heavy hadron chiral perturbation theory. There still exists the problem that the theoretical expectation is too small compared to the experimental data.

  5. Strange and charm mesons at FAIR

    CERN Document Server

    Tolos, L; Gamermann, D; Garcia-Recio, C; Molina, R; Nieves, J; Oset, E; Ramos, A

    2009-01-01

    We study the properties of strange and charm mesons in hot and dense matter within a self-consistent coupled-channel approach for the experimental conditions of density and temperature expected for the CBM experiment at FAIR/GSI. The in-medium solution at finite temperature accounts for Pauli blocking effects, mean-field binding of all the baryons involved, and meson self-energies. We analyze the behaviour in this hot and dense environment of dynamically-generated baryonic resonances together with the evolution with density and temperature of the strange and open-charm meson spectral functions. We test the spectral functions for strange mesons using energy-weighted sum rules and finally discuss the implications of the properties of charm mesons on the D_{s0}(2317) and the predicted X(3700) scalar resonances.

  6. Strong Couplings of Three Mesons with Charm(ing) Involvement

    CERN Document Server

    Lucha, Wolfgang; Sazdjian, Hagop; Simula, Silvano

    2016-01-01

    We determine the strong couplings of three mesons that involve, at least, one $\\eta_c$ or $J/\\psi$ meson, within the framework of a constituent-quark model by means of relativistic dispersion formulations. For strong couplings of $J/\\psi$ mesons to two charmed mesons, our approach leads to predictions roughly twice as large as those arising from QCD sum rules.

  7. Lifetimes of charmed mesons

    International Nuclear Information System (INIS)

    Using the ARGUS detector at the e+e- storage ring DORIS II at DESY, we have measured the lifetimes of the D0, D+ and Ds+ mesons. We find τsub(D0) = (4.8±0.4±0.3)x10-13 s, τsub(D+) = (10.5±0.8±0.7)x10-13 s and τsub(Ds+) = (5.6-1.2+1.3±0.8)x10.13s. (orig.)

  8. Single spin asymmetry for charm mesons

    Energy Technology Data Exchange (ETDEWEB)

    Dominguez Zacarias, G. [PIMAyC, Eje Central Lazaro Cardenas No. 152, Apdo. Postal 14-805, D.F. (Mexico); Herrera, G.; Mercado, J. [Centro de Investigacion y de Estudios Avanzados, Apdo. Postal 14-740, D.F. (Mexico)

    2007-08-15

    We study single spin asymmetries of D{sup 0} and D{sup -} mesons in polarized proton-proton collisions. A two component model is used to describe charm meson production. The production of D mesons occurs by recombination of the constituents present in the initial state as well as by fragmentation of quarks in the final state. This model has proved to describe the production of charm. The recombination component involves a mechanism of spin alignment that ends up in a single spin asymmetry. Experimental measurements of single spin asymmetry for pions at RHIC are compared with the model. Predictions for the asymmetry in D mesons are presented. (orig.)

  9. Single spin asymmetry for charm mesons

    International Nuclear Information System (INIS)

    We study single spin asymmetries of D0 and D- mesons in polarized proton-proton collisions. A two component model is used to describe charm meson production. The production of D mesons occurs by recombination of the constituents present in the initial state as well as by fragmentation of quarks in the final state. This model has proved to describe the production of charm. The recombination component involves a mechanism of spin alignment that ends up in a single spin asymmetry. Experimental measurements of single spin asymmetry for pions at RHIC are compared with the model. Predictions for the asymmetry in D mesons are presented. (orig.)

  10. Potential for discoveries in charm meson physics

    International Nuclear Information System (INIS)

    The possibility of using charm meson physics to test the Standard Model (SM) is reviewed. In the case of D0-bar D0 mixing, the SM contributions are carefully considered and the existence of a window for the observation of new physics is discussed. Some examples of extensions of the SM giving large mixing signals are presented. Finally, some distinctive aspects of CP violation and rare decays in charm mesons are discussed. copyright 1996 American Institute of Physics

  11. Charmed Mesons in Nuclei with Heavy-Quark Spin Symmetry

    Science.gov (United States)

    Tolos, L.; Garcia-Recio, C.; Nieves, J.; Romanets, O.; Salcedo, L. L.

    2013-08-01

    We study the properties of charmed pseudoscalar and vector mesons in dense matter within a unitary meson-baryon coupled-channel model which incorporates heavy-quark spin symmetry. This is accomplished by extending the SU(3) Weinberg-Tomozawa Lagrangian to incorporate spin-flavor symmetry and implement a suitable flavor symmetry breaking. Several resonances with negative parity are generated dynamically by the s-wave interaction between pseudoscalar and vector meson multiplets with 1/2+ and 3/2+ baryons. Those states are then compared to experimental data as well as theoretical models. Next, Pauli-blocking effects and meson self-energies are introduced in a self-consistent manner to obtain the open-charm meson spectral functions in a dense nuclear environment. We finally discuss the formation of D-mesic nuclei.

  12. Charmed mesons in nuclei with heavy-quark spin symmetry

    CERN Document Server

    Tolos, L; Nieves, J; Romanets, O; Salcedo, L L

    2012-01-01

    We study the properties of charmed pseudoscalar and vector mesons in dense matter within a unitary meson-baryon coupled-channel model which incorporates heavy-quark spin symmetry. This is accomplished by extending the SU(3) Weinberg-Tomozawa Lagrangian to SU(8) spin-flavor symmetry and implementing a suitable flavor symmetry breaking. Several resonances with negative parity are generated dynamically by the s-wave interaction between pseudoscalar and vector meson multiplets with $1/2^+$ and $3/2^+$ baryons. Those states are then compared to experimental data as well as theoretical models. Next, Pauli-blocking effects and meson self-energies are introduced in a self-consistent manner to obtain the open-charm meson spectral functions in a dense nuclear environment. We finally discuss the formation of $D$-mesic nuclei.

  13. Measurement of Charm Meson Lifetimes

    International Nuclear Information System (INIS)

    We report measurements of the D0 , D+ , and D+s meson lifetimes using 3.7 fb-1 of e+e- annihilation data collected near the Υ(4S) resonance with the CLEO detector. The measured lifetimes of the D0 , D+ , and D+s mesons are 408.5±4.1+3.5-3.4 fs , 1033.6±22.1+9.9-12.7 fs , and 486.3±15.0+4.9-5.1 fs . The precision of these lifetimes are comparable to those of the best previous measurements, and the systematic errors are very different. In a single experiment we find that the ratio of the D+s and D0 lifetimes is 1.19±0.04 . copyright 1999 The American Physical Society

  14. Charming Mesons with Baryons and Nuclei

    Science.gov (United States)

    Tolos, Laura

    2013-11-01

    The properties of charmed mesons in nuclear matter and nuclei are reviewed. Different frameworks are discussed paying a special attention to unitarized coupled-channel approaches which incorporate heavy-quark spin symmetry. Several charmed baryon states with negative parity are generated dynamically by the s-wave interaction between pseudoscalar and vector meson multiplets with 1/2+ and 3/2+ baryons. These states are compared to experimental data. Moreover, the properties of open-charm mesons in matter are analyzed. The in-medium solution accounts for Pauli blocking effects, and for the meson self-energies in a self-consistent manner. The behavior in the nuclear medium of the rich spectrum of dynamically-generated baryon states is studied as well as their influence in the self-energy and, hence, the spectral function of open charm. The possible experimental signatures of the in-medium properties of open charm are finally addressed, such as the formation of charmed nuclei, in connection with the future FAIR facility.

  15. Charming mesons with baryons and nuclei

    CERN Document Server

    Tolos, Laura

    2013-01-01

    The properties of charmed mesons in nuclear matter and nuclei are reviewed. Different frameworks are discussed paying a special attention to unitarized coupled-channel approaches which incorporate heavy-quark spin symmetry. Several charmed baryon states with negative parity are generated dynamically by the s-wave interaction between pseudoscalar and vector meson multiplets with $1/2^+$ and $3/2^+$ baryons. These states are compared to experimental data. Moreover, the properties of open-charm mesons in matter are analyzed. The in-medium solution accounts for Pauli blocking effects, and for the meson self-energies in a self-consistent manner. The behavior in the nuclear medium of the rich spectrum of dynamically-generated baryon states is studied as well as their influence in the self-energy and, hence, the spectral function of open charm. The possible experimental signatures of the in-medium properties of open charm are finally addressed, such as the formation of charmed nuclei, in connection with the future F...

  16. Charm Fragmentation and Excited Charm Meson Production at HERA

    International Nuclear Information System (INIS)

    Study of Charm Fragmentation into D*± Mesons in Deep-Inelastic Scattering at HERA The process of charm quark fragmentation is studied using D*± meson production in deep-inelastic scattering as measured by the H1 detector at HERA. Two different regions of phase space are investigated defined by the presence or absence of a jet containing the D*± meson in the event. The parameters of fragmentation functions are extracted for QCD models based on leading order matrix elements and DGLAP or CCFM evolution of partons together with string fragmentation and particle decays. Additionally, they are determined for a next-to-leading order QCD calculation in the fixed flavour number scheme using the independent fragmentation of charm quarks to D*± mesons. Measurement of the charm fragmentation function in D* photoproduction at HERA The charm fragmentation function has been measured in D* photoproduction with the ZEUS detector at HERA using an integrated luminosity of 120 pb-1. The fragmentation function is measured versus z, the ratio of E+pparallel for the D* meson and that for the associated jet, where E is the energy and pparallel the longitudinal momentum relative to the jet axis. Jets were reconstructed using the kT clustering algorithm and required to have transverse energy greater than 9 GeV. The D* meson associated with the jet was required to have a transverse momentum greater than 2 GeV. The measured function is compared to different fragmentation models incorporated in leading-logarithm Monte Carlo simulations and a next-to-leading-order calculation. The results are similar to those from e+e- experiments. Excited charm meson production at HERA The production of the excited charm mesons D1(2420)0 and D2*(2460)0 in inelastic ep scattering was studied with the ZEUS detector at HERA using an integrated luminosity of 372 pb-1. Masses and widths were determined and and a helicity analysis was performed. The results are compared with previous measurements and with

  17. Charmed meson production and decay properties at the psi(3770)

    Energy Technology Data Exchange (ETDEWEB)

    1979-05-01

    A remeasurement of the resonance near E/sub cm/ = 3.77 GeV in the e/sup +/e/sup -/ annihilation is presented. The properties of the resonance are used to deduce branching fractions of charmed mesons into hadronic final states. Several previously unseen decay modes are reported. Decays into Cabibbo suppressed final states are observed. The inclusive properties of D meson decays are studied, including strangeness and charged particle multiplicity. The semileptonic branching fractions for D/sup 0/ and D/sup -+/ are measured, providing a determination of the relative lifetimes of these particles.

  18. Properties of excited charm and charm-strange mesons

    Science.gov (United States)

    Godfrey, Stephen; Moats, Kenneth

    2016-02-01

    We calculate the properties of excited charm and charm-strange mesons. We use the relativized quark model to calculate their masses and wave functions that are used to calculate radiative transition partial widths and the 3P0 quark-pair-creation model to calculate their strong decay widths. We use these results to make quark model spectroscopic assignments for recently observed charm and charm-strange mesons. In particular, we find that the properties of the DJ(2550 )0 and DJ*(2600 )0 are consistent with those of the 2 1S0 (c u ¯) and the 2 3S1 (c u ¯) states respectively, and the D1*(2760 )0, D3*(2760 )-,and DJ(2750 )0with those of the 1 3D1 (c u ¯), 1 3D3 (d c ¯), and 1 D2(c u ¯) states respectively. We tentatively identify the DJ*(3000 )0 as the 1 3F4 (c u ¯ ) and favor the DJ(3000 )0 to be the 3 1S0 (c u ¯ ) although we do not rule out the 1 F3 and 1 F3' assignment. For the recently observed charm-strange mesons we identify the Ds1 *(2709 )±,Ds1 *(2860 )-,andDs3 *(2860 )-as the 2 3S1 (c s ¯), 1 3D1 (s c ¯), and 1 3D3 (s c ¯) states respectively and suggest that the Ds J(3044 )± is most likely the Ds 1(2 P1' ) or Ds 1(2 P1) state although it might be the Ds2 *(2 3P2 ) with the D K final state too small to be observed with current statistics. Based on the predicted properties of excited states, that they do not have too large a total width and that they have a reasonable branching ratio to simple final states, we suggest states that should be able to be found in the near future. We expect that the tables of properties summarizing our results will be useful for interpreting future observations of charm and charm-strange mesons.

  19. Dark photons from charm mesons at LHCb

    CERN Document Server

    Ilten, Philip; Williams, Mike; Xue, Wei

    2015-01-01

    We propose a search for dark photons $A^{\\prime}$ at the LHCb experiment using the charm meson decay $D^*(2007)^0 \\!\\to D^0 A^{\\prime}$. At nominal luminosity, $D^{*0} \\!\\to D^0 \\gamma$ decays will be produced at about 700kHz within the LHCb acceptance, yielding over 5 trillion such decays during Run 3 of the LHC. Replacing the photon with a kinetically-mixed dark photon, LHCb is then sensitive to dark photons that decay as $A^{\\prime}\\!\\to e^+e^-$. We pursue two search strategies in this paper. The displaced strategy takes advantage of the large Lorentz boost of the dark photon and the excellent vertex resolution of LHCb, yielding a nearly background-free search when the $A^{\\prime}$ decay vertex is significantly displaced from the proton-proton primary vertex. The resonant strategy takes advantage of the large event rate for $D^{*0} \\!\\to D^0 A^{\\prime}$ and the excellent invariant mass resolution of LHCb, yielding a background-limited search that nevertheless covers a significant portion of the $A^{\\prime}...

  20. Dark photons from charm mesons at LHCb

    Science.gov (United States)

    Ilten, Philip; Thaler, Jesse; Williams, Mike; Xue, Wei

    2015-12-01

    We propose a search for dark photons A' at the LHCb experiment using the charm meson decay D*(2007 )0→D0A'. At nominal luminosity, D*0→D0γ decays will be produced at about 700 kHz within the LHCb acceptance, yielding over 5 trillion such decays during Run 3 of the LHC. Replacing the photon with a kinetically mixed dark photon, LHCb is then sensitive to dark photons that decay as A'→e+e-. We pursue two search strategies in this paper. The displaced strategy takes advantage of the large Lorentz boost of the dark photon and the excellent vertex resolution of LHCb, yielding a nearly background-free search when the A' decay vertex is significantly displaced from the proton-proton primary vertex. The resonant strategy takes advantage of the large event rate for D*0→D0A' and the excellent invariant-mass resolution of LHCb, yielding a background-limited search that nevertheless covers a significant portion of the A' parameter space. Both search strategies rely on the planned upgrade to a triggerless-readout system at LHCb in Run 3, which will permit the identification of low-momentum electron-positron pairs online during data taking. For dark photon masses below about 100 MeV, LHCb can explore nearly all of the dark photon parameter space between existing prompt-A' and beam-dump limits.

  1. Diffractive hadroproduction of charmed D mesons

    International Nuclear Information System (INIS)

    We have observed charmed D meson production from a hydrogen target in a 217 GeV/c π- beam. Hadronic decays in the K+-π+-π+- channels were reconstructed in the Chicago Cyclotron Spectrometer at Fermilab. The proton recoil angle and momentum transfer were programmed so that objects of mass near that of two D mesons would be produced in the forward direction. A mass peak in the 40-MeV bin at 1875 MeV was found in each channel. The cross section for D+- production is 6--10 μb

  2. Open charm meson production at LHC*

    Directory of Open Access Journals (Sweden)

    Luszczak Marta

    2012-12-01

    Full Text Available We discuss charm production at the LHC. The production of single cc¯$car c$ pairs is calculated in the kt-factorization approach. We use Kimber-Martin-Ryskin unintegrated gluon distributions in the proton. The hadronization is included with the help of Peterson fragmentation functions. Transverse momentum and pseudorapidity distributions of charmed mesons are presented and compared to recent results of the ALICE, LHCb and ATLAS collaborations. Furthermore we discuss production of two pairs of cc¯ $car c$ within a simple formalism of double-parton scattering (DPS. Surprisingly large cross sections, comparable to single-parton scattering (SPS, are predicted for LHC energies. We discuss perspectives how to identify the double scattering contribution. We predict much larger cross section for large rapidity distance between charm quarks from different hard parton scatterings compared to single scattering.

  3. Photoproduction of charmed mesons: study of charmed mesons decays involving two charged kaons in the final state

    International Nuclear Information System (INIS)

    We present a study of charmed mesons decays involving two charged kaons in the final state. The experimental results are obtained from the data of the CERN NA14/2 experiment in a photon beam of mean energy 90 GeV. The main component of the apparatus is a silicon vertex detector made of an active target and a telescope of microstrips planes, the high spatial resolution of which allows to separate vertices and to measure the charmed mesons distance of flight. An electromagnetic calorimeter enables us to search for decay modes involving a π0. We have observed the charmed mesons D0, D+, Ds+ and their antiparticles in six different decay modes, two of which are new: Φπ+ π- and Φπ+π0. The results obtained on branching ratios are in agreement with theoretical predictions except those on the Φπ+π0 mode for which the predictions on the resonant mode Φp+ are not reproduced by the data

  4. Production of charmed mesons in Z decays

    Science.gov (United States)

    Buskulic, D.; de Bonis, I.; Decamp, D.; Ghez, P.; Goy, C.; Lees, J.-P.; Minard, M.-N.; Pietrzyk, B.; Ariztizabal, F.; Comas, P.; Crespo, J. M.; Efthymiopoulos, I.; Fernandez, E.; Fernandez-Bosman, M.; Gaitan, V.; Garrido, Ll.; Mattison, T.; Orteu, S.; Pacheco, A.; Padilla, C.; Pascual, A.; Creanza, D.; de Palma, M.; Farilla, A.; Iaselli, G.; Maggi, G.; Marinelli, N.; Natali, S.; Nuzzo, S.; Ranieri, A.; Raso, G.; Romano, F.; Ruggieri, F.; Selvaggi, G.; Silvestris, L.; Tempesta, P.; Zito, G.; Chai, Y.; Hu, H.; Huang, D.; Huang, X.; Lin, J.; Wang, T.; Xie, Y.; Xu, D.; Xu, R.; Zhang, J.; Zhang, L.; Zhao, W.; Bonvicini, G.; Boudreau, J.; Casper, D.; Drevermann, H.; Forty, R. W.; Ganis, G.; Gay, C.; Girone, M.; Hagelberg, R.; Harvey, J.; Hilgart, J.; Jacobsen, R.; Jost, B.; Knobloch, J.; Lehraus, I.; Maggi, M.; Markou, C.; Martinez, M.; Mato, P.; Meinhard, H.; Minten, A.; Miquel, R.; Moser, H.-G.; Palazzi, P.; Pater, J. R.; Perlas, J. A.; Perrodo, P.; Pusztaszeri, J.-F.; Ranjard, F.; Rolandi, L.; Rothberg, J.; Ruan, T.; Saich, M.; Schlatter, D.; Schmelling, M.; Sefkow, F.; Tejessy, W.; Tomalin, I. R.; Veenhof, R.; Wachsmuth, H.; Wasserbaech, S.; Wiedemann, W.; Wildish, T.; Witzeling, W.; Wotschack, J.; Ajaltouni, Z.; Bardadin-Otwinowska, M.; Barres, A.; Boyer, C.; Falvard, A.; Gay, P.; Guicheney, C.; Henrard, P.; Jousset, J.; Michel, B.; Montret, J.-C.; Pallin, D.; Perret, P.; Podlyski, F.; Proriol, J.; Saadi, F.; Fearnley, T.; Hansen, J. B.; Hansen, J. D.; Hansen, J. R.; Hansen, P. H.; Johnson, S. D.; Møllerud, R.; Nilsson, B. S.; Kyriakis, A.; Simopoulou, E.; Siotis, I.; Vayaki, A.; Zachariadou, K.; Badier, J.; Blondel, A.; Bonneaud, G.; Brient, J. C.; Bourdon, B.; Fouque, G.; Passalacqua, L.; Rougé, A.; Rumpf, M.; Tanaka, R.; Verderi, M.; Videau, H.; Candlin, D. J.; Parsons, M. I.; Veitch, E.; Focardi, E.; Moneta, L.; Parrini, G.; Corden, M.; Delfino, M.; Georgiopoulos, C.; Ikeda, M.; Jaffe, D. E.; Levinthal, D.; Antonelli, A.; Bencivenni, G.; Bologna, G.; Bossi, F.; Campana, P.; Capon, G.; Cerutti, F.; Chiarella, V.; Felici, G.; Laurelli, P.; Mannocchi, G.; Murtas, F.; Murtas, G. P.; Pepe=Altarelli, M.; Salomone, S.; Colrain, P.; Ten Have, I.; Lynch, J. G.; Maitland, W.; Morton, W. T.; Raine, C.; Reeves, P.; Scarr, J. M.; Smith, K.; Smith, M. G.; Thompson, A. S.; Thorn, S.; Turnbull, R. M.; Brandl, B.; Braun, O.; Geweniger, C.; Graefe, G.; Hanke, P.; Hepp, V.; Karger, C.; Kluge, E. E.; Maumary, Y.; Putzer, A.; Rensch, B.; Stahl, A.; Tittel, K.; Wunsch, M.; Beuselinck, M.; Binnie, D. M.; Cameron, W.; Cattaneo, M.; Colling, D. J.; Dornan, P. J.; Hassard, J. F.; Lieske, N. M.; Moutoussi, A.; Nash, J.; Patton, S.; Payne, D. G.; Phillips, M. J.; San Martin, G.; Sedgbeer, J. K.; Wright, A. G.; Girtler, P.; Kuhn, D.; Rudolph, G.; Vogl, R.; Bowdery, C. K.; Brodbeck, T. J.; Finch, A. J.; Foster, F.; Hughes, G.; Jackson, D.; Keemer, N. R.; Nuttal, M.; Patel, A.; Sloan, T.; Snow, S. W.; Whelan, E. P.; Galla, A.; Greene, A. M.; Kleinknecht, K.; Raab, J.; Renk, B.; Sander, H.-G.; Schmidt, H.; Walther, S. M.; Wanke, R.; Wolf, B.; Bencheikh, A. M.; Benchouk, C.; Bonissent, A.; Calvet, D.; Carr, J.; Coyle, P.; Diaconu, C.; Drinkard, J.; Etienne, F.; Nicod, D.; Payre, P.; Roos, L.; Rousseau, D.; Schwemling, P.; Talby, M.; Adlung, S.; Assmann, R.; Bauer, C.; Blum, W.; Brown, D.; Cattaneo, P.; Dehning, B.; Dietl, H.; Dydak, F.; Frank, M.; Halley, A. W.; Jakobs, K.; Lauber, J.; Lütjens, G.; Lutz, G.; Männer, G.; Richter, R.; Schröder, J.; Schwarz, A. S.; Settles, R.; Seywerd, H.; Stierlin, H.; Stiegler, U.; Denis, R. St.; Wolf, G.; Alemany, R.; Boucrot, J.; Callot, O.; Cordier, A.; Davier, M.; Duflot, L.; Grivaz, J.-F.; Heusse, Ph.; Janot, P.; Kim, D. W.; Le Diberder, F.; Lefrançois, J.; Lutz, A.-M.; Musolino, G.; Schune, M.-H.; Veillet, J.-J.; Videau, I.; Abbaneo, D.; Bagliesi, G.; Batignani, G.; Bottigli, U.; Bozzi, C.; Calderini, G.; Carpinelli, M.; Ciocci, M. A.; Ciulli, V.; Dell'Orso, R.; Ferrante, I.; Fidecaro, F.; Foà, L.; Forti, F.; Giassi, A.; Giorgi, M. A.; Gregorio, A.; Ligabue, F.; Luisiani, A.; Mannelli, E. B.; Marrocchesi, P. S.; Messineo, A.; Palla, F.; Rizzo, G.; Sanguinetti, G.; Spagnolo, P.; Steinberger, J.; Tenchini, R.; Tonelli, G.; Triggiani, G.; Valassi, A.; Vannini, C.; Venturi, A.; Verdini, P. G.; Walsh, J.; Betteridge, A. P.; Gao, Y.; Green, M. G.; Johnson, D. L.; March, P. V.; Medcalf, T.; Mir, Ll. M.; Quazi, I. S.; Strong, J. A.; Bertin, V.; Botterill, D. R.; Clifft, R. W.; Edgecock, T. R.; Haywood, S.; Edwards, M.; Norton, P. R.; Thompson, J. C.; Bloch-Devaux, B.; Colas, P.; Duarte, H.; Emery, S.; Kozanecki, W.; Lançon, E.; Lemaire, M. C.; Locci, E.; Marx, B.; Perez, P.; Rander, J.; Renardy, J.-F.; Rosowsky, A.; Roussarie, A.; Schuller, J.-P.; Schwindling, J.; Si Mohand, D.; Vallage, B.; Johnson, R. P.; Litke, A. M.; Taylor, G.; Wear, J.; Babbage, W.; Booth, C. N.; Buttar, C.; Cartwright, S.; Combley, F.; Dawson, I.; Thompson, L. F.; Barberio, E.; Böhrer, A.; Brandt, S.; Cowan, G.; Grupen, C.; Lutters, G.; Rivera, F.; Schäfer, U.; Smolik, L.; Bosisio, L.; Della Marina, R.; Giannini, G.; Bobbo, B.; Pitis, L.; Ragusa, F.; Bellantoni, L.; Chen, W.; Conway, J. S.; Feng, Z.; Ferguson, D. P. S.; Gao, Y. S.; Grahl, J.; Harton, J. L.; Hayes, O. J.; Nachtman, J. M.; Pan, Y. B.; Saadi, Y.; Schmitt, M.; Scott, I.; Sharma, V.; Shi, Z. H.; Turk, J. D.; Walsh, A. M.; Weber, F. V.; Wu, Sau Lan; Wu, X.; Zheng, M.; Zobernig, G.

    1994-03-01

    The production of charmed mesonsmathop {D^0 }limits^{( - )} , D ± , and D *± is studied in a sample of 478,000 hadronic Z decays. The production rates are measured to be 10052_2005_Article_BF01559519_TeX2GIFE1.gif begin{gathered} {Γ (Z to D^{* ± } X)}/{Γ _{had }} = 0.187 ± 0.015(exp .) ± 0.013(BR), \\ {Γ (Z to D^ ± X)}/{Γ _{had }} = 0.251 ± 0.026(exp .) ± 0.025(BR), \\ {Γ (Z to mathop {D^0 }limits^{( - )} X)}/{Γ _{had }} = 0.518 ± 0.052(exp .) ± 0.035(BR), \\ where the errors from this analysis are separated from those coming from the D branching ratios (BR). The D *± momentum distribution is extracted separately forZ to cbar c andZ to bbar b events with the help of event shape variables. It is consistent with the prediction of the JETSET Monte Carlo program after adjustment of the charm fragmentation function. Constraining the shape of theZ to bbar b contribution, the average fraction of the beam energy taken by a D * meson produced in the fragmentation of a charm quark is extracted by a parametric fit to be c =0.495±0.011±0.007. Evidence for D **0 ( D 1(2420)0 and/or D {2/*}(2460)0) production is found in theD^{* ± } π ^ mp channel, accounting for a fraction (18±5±2)% of all D *± production. The relative production of vector and pseudoscalar mesons is dicussed, together with the possible effects of D ** production. The c-quark forward-backward Z-pole asymmetry is detrmined from that of high momentum D *± to be A {/FB 0,c }=(7.7±4.4)%.

  5. Search for popcorn mesons in events with two charmed baryons

    Science.gov (United States)

    Hartfiel, Brandon

    The physics of this dissertation is divided into two parts. The first part measures the Λc → pi kp continuum momentum spectrum at a center of mass energy of 10.54 GeV/c, which is just below the Υ(4s) resonance. The data sample consists of 15,400 Λc baryons from 9.46 fb-1 of integrated luminosity collected with the BaBar detector at the PEP-II asymmetric B factory at the Stanford Linear Accelerator Center. With more than 13 times more data than the best previous measurement, we are able to exclude some of the simpler, one parameter fragmentation functions. In the second part, we add the Λc → K0p mode, and look for events with a Λc+ and a Λ c- in order to look for "popcorn" mesons formed between the baryon and antibaryon. We add on-resonance data, with a kinematic cut to eliminate background from B decays, as well as BaBar run 3 and 4 data to increase the total data size to 219.70 fb-1. We find 619 events after background subtraction. After a subtraction of 1.06+/-.09 charged pions coming from decays of known resonances to Λc + npi, we are left with 2.63+/-.21 additional charged pious in each of these events. This is significantly higher than the .5 popcorn mesons per bayon pair used in the current tuning of Pythia 6.2, the most widely used Monte Carlo generator. The extra mesons we find appear to be the first direct evidence of popcorn mesons, although some of them could be arising from hypothetical unresolved, unobserved charmed baryon resonances contributing decay mesons to our data. To contribute a significant fraction, this hypothesis requires a large number of such broad unresolved states and seems unlikely, but can not be completely excluded.

  6. Semileptonic decays of B meson into charmed meson

    International Nuclear Information System (INIS)

    Recent results on semileptonic decays of B meson into charmed meson using the CLEO detector at CESR are summarized. Ratios of the inclusive semileptonic branching fractions, B(B-→D0Xl-bar ν), B(bar B0→D+Xl-bar νXl-bar ν), and B(bar B0→D+) average B meson semileptonic branching fraction are reported. The branching fractions of the exclusive final states, B-→D0l-bar ν, B-→D0l-bar ν, and bar B0→D+l-bar ν are measured. The ratio of B(B-→D0l-bar ν) to B(B-→D0l-bar ν) and the polarization of the D*+ are obtained and compared with theoretical models. The value of |Vcb| is calculated from the exclusive branching fractions for various models. Finally, the lifetime ratio of the charged and neutral B's (τ+/τ0) is determined from the ratio of B(B-→D0l-bar ν) to B(bar B0→D+l-bar ν) to be 0.85±0.20+0.22-0.16

  7. Search for Popcorn Mesons in Events with Two Charmed Baryons

    Energy Technology Data Exchange (ETDEWEB)

    Hartfiel, Brandon; /SLAC

    2006-07-07

    The physics of this note is divided into two parts. The first part measures the {Lambda}{sub c} {yields} {pi}kp continuum momentum spectrum at a center of mass energy of 10.54 GeV/c. The data sample consists of 15,400 {Lambda}{sub c} baryons from 9.46 fb{sup -1} of integrated luminosity. With more than 13 times more data than the best previous measurement, we are able to exclude some of the simpler, one parameter fragmentation functions. In the second part, we add the {Lambda}{sub c} {yields} K{sup 0}p mode, and look for events with a {Lambda}{sub c}{sup +} and a {bar {Lambda}}{sub c}{sup -} in order to look for ''popcorn'' mesons formed between the baryon and antibaryon. We add on-resonance data, with a kinematic cut to eliminate background from B decays, as well as BaBar run 3 and 4 data to increase the total data size to 219.70 fb{sup -1}. We find 619 events after background subtraction. After a subtraction of 1.06 {+-} .09 charged pions coming from decays of known resonances to {Lambda}{sub c} + {eta}{pi}, we are left with 2.63 {+-} .21 additional charged pions in each of these events. This is significantly higher than the .5 popcorn mesons per baryon pair used in the current tuning of Pythia 6.2, the most widely used Monte Carlo generator. The extra mesons we find appear to be the first direct evidence of popcorn mesons, although some of them could be arising from hypothetical unresolved, unobserved charmed baryon resonances contributing decay mesons to our data. To contribute a significant fraction, this hypothesis requires a large number of such broad unresolved states and seems unlikely, but can not be completely excluded.

  8. Phenomenology of charmed mesons in the extended linear sigma model

    International Nuclear Information System (INIS)

    We study the so-called extended linear sigma model for the case of four quark flavors. This model is based on global chiral symmetry and dilatation invariance and includes, besides scalar and pseudoscalar mesons, vector and axial-vector mesons. Most of the parameters of the model have been determined in previous work by fitting properties of mesons with three quark flavors. Only three new parameters, all related to the current charm quark mass, appear when introducing charmed mesons. Surprisingly, within the accuracy expected from our approach, the masses of open charmed mesons turn out to be in quantitative agreement with experimental data. On the other hand, with the exception of J/ψ, the masses of charmonia are underpredicted by about 10%. It is remarkable that our approach correctly predicts (within errors) the mass splitting between spin-0 and spin-1 negative-parity open charm states. This indicates that, although the charm quark mass breaks chiral symmetry quite strongly explicitly, this symmetry still seems to have some influence on the properties of charmed mesons. (orig.)

  9. Strange and charm meson masses from twisted mass lattice QCD

    International Nuclear Information System (INIS)

    We present results of a twisted mass lattice QCD computation of the strange and charm meson spectrum with 2+1+1 dynamical quark flavors. Particular focus is put on excited D and Ds mesons and on a connection to the ''1/2,3/2 limit'' for the D(s)**.

  10. Charmed mesons and leptons from semileptonic decays at the LHC

    CERN Document Server

    Maciula, Rafal

    2013-01-01

    We discuss production of charmed mesons as well as electrons/muons from semileptonic decays of charm and bottom mesons in proton-proton collisions at the LHC. The cross section for inclusive production of $c \\bar c$ and $b \\bar b$ pairs is calculated in the framework of the $k_{\\perp}$-factorization approach. Here, the KMR and Jung CCFM unintegrated gluon distribution functions are used. Theoretical uncertainties of the model related to the choice of renormalization and factorization scales as well as due to the quark mass are also discussed. The hadronization of charm and bottom quarks is included within the fragmentation functions technique. Inclusive differential distributions in transverse momentum of charmed mesons are presented and compared to recent results of the ALICE collaboration. Furthermore, we also consider production of different $D \\bar D$ pairs in unique kinematics of forward rapidities of the LHCb experiment. Kinematical correlations in azimuthal angle $\\varphi_{D\\bar D}$ and invariant mass ...

  11. Mesonic Decay of Charm Hypernuclei Λc+

    Directory of Open Access Journals (Sweden)

    Ghosh Sabyasachi

    2016-01-01

    Full Text Available Λc+ hypernuclei are expected to have binding energies and other properties similar to those of strange hypernuclei in view of the similarity between the quark structures of the strange and charmed hyperons, namely Λ(uds and Λc+(udc. One striking difference however occurs in their mesonic decays, as there is almost no Pauli blocking in the nucleonic decay of a charm hypernucleus because the final-state nucleons leave the nucleus at high energies. The nuclear medium nevertheless affects the mesonic decays of charm hypernucleus because the nuclear mean fields modify the masses of the charm hyperon. In the present communication we present results of a first investigation of the effects of finite baryon density on different weak mesonic decay channels of the Λc+ baryon. We found a non-negligible reduction of the decay widths as compared to their vacuum values.

  12. Mesonic Decay of Charm Hypernuclei Λc+

    Science.gov (United States)

    Ghosh, Sabyasachi; Fontoura, Carlos E.; Krein, Gastão

    2016-03-01

    Λc+ hypernuclei are expected to have binding energies and other properties similar to those of strange hypernuclei in view of the similarity between the quark structures of the strange and charmed hyperons, namely Λ(uds) and Λc+(udc). One striking difference however occurs in their mesonic decays, as there is almost no Pauli blocking in the nucleonic decay of a charm hypernucleus because the final-state nucleons leave the nucleus at high energies. The nuclear medium nevertheless affects the mesonic decays of charm hypernucleus because the nuclear mean fields modify the masses of the charm hyperon. In the present communication we present results of a first investigation of the effects of finite baryon density on different weak mesonic decay channels of the Λc+ baryon. We found a non-negligible reduction of the decay widths as compared to their vacuum values.

  13. Mesonic Decay of Charm Hypernuclei $\\Lambda^+_c$

    CERN Document Server

    Ghosh, Sabyasachi; Krein, Gastão

    2016-01-01

    $\\Lambda^+_c$ hypernuclei are expected to have binding energies and other properties similar to those of strange hypernuclei in view of the similarity between the quark structures of the strange and charmed hyperons, namely $\\Lambda(uds)$ and $\\Lambda^+_c (udc)$. One striking difference however occurs in their mesonic decays, as there is almost no Pauli blocking in the nucleonic decay of a charm hypernucleus because the final-state nucleons leave the nucleus at high energies. The nuclear medium nevertheless affects the mesonic decays of charm hypernucleus because the nuclear mean fields modify the masses of the charm hyperon. In the present communication we present results of a first investigation of the effects of finite baryon density on different weak mesonic decay channels of the $\\Lambda^+_c$ baryon. We found a non-negligible reduction of the decay widths as compared to their vacuum values.

  14. Recent progress in lattice calculations of properties of open-charm mesons

    CERN Document Server

    Mohler, Daniel

    2015-01-01

    Recent progress in lattice calculations of properties of open-charm mesons, both regular and exotic, is reviewed, with an emphasis on spectroscopy. After reviewing recent calculations of excited state energy levels I will discuss progress in extracting hadronic masses and widths of charmed states from Lattice QCD simulations including low-lying scattering channels directly, to determine phase shift data and bound state/ resonance properties. With regard to other properties results from recent calculations of the $DD^*\\pi$ and $DD\\rho$, $D^*D^*\\rho$ couplings are presented. Beyond regular mesons, searches for explicitly exotic (tetraquark) states are also reviewed.

  15. Decays of mesons with charm quarks on the lattice

    International Nuclear Information System (INIS)

    We investigate mesons containing charm quarks on fine lattices with a-1 ∝ 5 GeV. The quenched approximation is employed using theWilson gauge action at β = 6.6 and nonperturbatively O(a) improvedWilson quarks. We present results for decay constants using various interpolating fields and give preliminary results for form factors of semileptonic decays of Ds mesons to light pseudoscalar mesons. (orig.)

  16. Open flavour charmed mesons in a quantum chromodynamics potential model

    Indian Academy of Sciences (India)

    Krishna Kingkar Pathak; D K Choudhury

    2012-12-01

    We modify the mesonic wave function by using a short distance scale 0 in analogy with hydrogen atom and estimate the values of masses and decay constants of the open flavour charm mesons , $D_{s}$ and $B_{c}$ within the framework of a QCD potential model. We also calculate leptonic decay widths of these mesons to study branching ratios and lifetime. The results are in good agreement with experimental and other theoretical values.

  17. On the Dalitz plot approach in non-leptonic charm meson decays

    International Nuclear Information System (INIS)

    We show that the non-resonant contribution to non-leptonic charm meson decays can not be considered constant in the phase space of the reaction as it usually is. We argue that this is relevant for any weak reaction. We discuss in detail the decay D+ → K- π+ π+. (author). 19 refs., 2 figs

  18. Tetraquarks in the 1/N expansion and meson-meson resonances

    CERN Document Server

    Maiani, L; Riquer, V.

    2016-01-01

    Diquarks are found to have the right degrees of freedom to describe the tetraquark poles in hidden-charm to open-charm meson-meson amplitudes. Compact tetraquarks result as intermediate states in non-planar diagrams of the 1/N expansion and the corresponding resonances are narrower than what estimated before. The proximity of tetraquarks to meson-thresholds has an apparent role in this analysis and, in the language of meson molecules, an halving rule in the counting of states is obtained.

  19. Nonleptonic weak decays of charmed mesons

    OpenAIRE

    Buccella, F.; Lusignoli, M.; Miele, G.; A. Pugliese; Santorelli, P.

    1994-01-01

    A previous analysis of two-body Cabibbo allowed nonleptonic decays of $D^0$ mesons and of Cabibbo allowed and first-forbidden decays of $D^+$ and $D_s^+$ has been adjourned using more recent experimental data and extended to the Cabibbo forbidden decays of $D^0$. Annihilation and W-exchange contributions as well as final state interaction effects (assumed to be dominated by nearby resonances) have been included and are in fact crucial to obtain a reasonable agreement with the experimental dat...

  20. Production of excited charm and charm-strange mesons at HERA

    Energy Technology Data Exchange (ETDEWEB)

    Chekanov, S.; Derrick, M.; Magill, S. [Argonne National Laboratory, Argonne, IL (US)] (and others)

    2008-07-15

    The production of excited charm, D{sub 1}(2420){sup 0} and D{sup *}{sub 2}(2460){sup 0}, and charm-strange, D{sub s1}(2536){sup {+-}}, mesons in ep collisions was measured with the ZEUS detector at HERA using an integrated luminosity of 126 pb{sup -1}. Masses, widths and helicity parameters were determined. The measured yields were converted to the rates of c quarks hadronising as a given excited charm meson and to the ratios of the dominant D{sup *}{sub 2}(2460){sup 0} and D{sub s1}(2536){sup {+-}} branching fractions. A search for the radially excited charm meson, D{sup *'}(2640){sup {+-}}, was also performed. The results are compared with those measured previously and with theoretical expectations. (orig.)

  1. Production of excited charm and charm-strange mesons at HERA

    CERN Document Server

    Chekanov, S; Magill, S; Musgrave, B; Nicholass, D; Repond, J; Yoshida, R; Mattingly, M C K; Antonioli, P; Bari, G; Bellagamba, L; Boscherini, D; Bruni, A; Bruni, G; Cindolo, F; Corradi, M; Iacobucci, G; Margotti, A; Nania, R; Polini, A; Antonelli, S; Basile, M; Bindi, M; Cifarelli, L; Contin, A; De Pasquale, S; Sartorelli, G; Zichichi, A; Bartsch, D; Brock, I; Hartmann, H; Hilger, E; Jakob, H P; Jüngst, M; Nuncio-Quiroz, A E; Paul, E; Samson, U; Schönberg, V; Shehzadi, R; Wlasenko, M; Brook, N H; Heath, G P; Morris, J D; Capua, M; Fazio, S; Mastroberardino, A; Schioppa, M; Susinno, G; Tassi, E; Kim, J Y; Ibrahim, Z A; Kamaluddin, B; Wan-Abdullah, W A T; Ning, Y; Ren, Z; Sciulli, F; Chwastowski, J; Eskreys, A; Figiel, J; Galas, A; Gil, M; Olkiewicz, K; Stopa, P; Zawiejski, L; Adamczyk, L; Bold, T; Grabowska-Bold, I; Kisielewska, D; Lukasik, J; Przybycie, M; Suszycki, L; Kotanski, A; Slomiski, W; Behrens, U; Blohm, C; Bonato, A; Borras, K; Ciesielski, R; Coppola, N; Fang, S; Fourletova, J; Geiser, A; Göttlicher, P; Grebenyuk, J; Gregor, I; Haas, T; Hain, W; Hüttmann, A; Januschek, F; Kahle, B; Katkov, I I; Klein, U; Kötz, U; Kowalski, H; Lobodzinska, E; Löhr, B; Mankel, R; Melzer-Pellmann, I A; Miglioranzi, S; Montanari, A; Namsoo, T; Notz, o D; Parenti, A; Rinaldi, L; Roloff, P; Rubinsky, I; Santamarta, R; Schneekloth, U; Spiridonov, A; Szuba, D; Szuba, J; Theedt, T; Wolf, G; Wrona, K; Yagues-Molina, A G; Youngman, C; Zeuner, W; Drugakov, V; Lohmann, W; Schlenstedt, S; Barbagli, G; Gallo, E; Pelfer, P G; Bamberger, A; Dobur, D; Karstens, F; Vlasov, N N; Bussey, P J; Doyle, A T; Dunne, W; Forrest, M; Rosin, M; Saxon, D H; Skillicorn, I O; Gialas, I; Papageorgiu, K; Holm, U; Klanner, R; Lohrmann, E; Schleper, P; Schörner-Sadenius, T; Sztuk, J; Stadie, H; Turcato, o M; Foudas; Fry, C; Long, K R; Tapper, A D; Matsumoto, T; Nagano, K; Tokushuku, K; Yamada, S; Yamazaki, Y; Barakbaev, A N; Boos, E G; Pokrovskiy, N S; Zhautykov, B O; Aushev, V; Bachynska, O; Borodin, M; Kadenko, I; Kozulia, A; Libov, V; Lisovyi, M; Lontkovskyi, D; Makarenko, I; Sorokin, Iu; Verbytskyi, A; Volynets, O; Son, D; De Favereau, J; Piotrzkowski, K; Barreiro, F; Glasman, C; Jiménez, M; Labarga, L; Del Peso, J; Ron, E; Soares, M; Terrón, J; Zambrana, M; Corriveau, F; Liu, C; Schwartz, J; Walsh, R; Zhou, C; Tsurugai, T; Antonov, A; Dolgoshein, B A; Gladkov, D; Sosnovtsev, V; Stifutkin, A; Suchkov, S; Dementiev, R K; Ermolov, P F; Gladilin, L K; Golubkov, Yu A; Khein, L A; Korzhavina, I A; Kuzmin, V A; Levchenko, B B; Lukina, O Yu; Proskuryakov, A S; Shcheglova, L M; Zotkin, D S; Caldwell, A; Kollar, D; Reisert, B; Schmidke, W B; Grigorescu, G; Keramidas, A; Koffeman, E; Kooijman, P; Pellegrino, A; Tiecke, H; Vázquez, M; Wiggers, L; Brümmer, N; Bylsma, B; Durkin, L S; Lee, A; Ling, T Y; Allfrey, P D; Bell, M A; Cooper-Sarkar, A M; Devenish, R C E; Ferrando, J; Foster, B; Korcsak-Gorzo, K; Oliver, K; Robertson, A; Uribe-Estrada, C; Walczak, R; Bertolin, A; Dal Corso, F; Dusini, S; Longhin, A; Stanco, L; Bellan, P; Brugnera, R; Carlin, R; Garfagnini, A; Limentani, S; Oh, B Y; Raval, A; Ukleja, J; Whitmore, J J; Iga, Y; D'Agostini, G; Marini, G; Cole, A Nigro J E; Hart, J C; Abramowicz, H; Ingbir, R; Kananov, S; Levy, A; Stern, A; Kuze, M; Maeda, J; Hori, R; Kagawa, S; Okazaki, N; Shimizu, S; Tawara, T; Hamatsu, R; Kaji, H; Kitamura, S; Ota, O; Costa, Y D Ri M; Ferrero, M I; Monaco, V; Sacchi, R; Solano, A; Arneodo, M; Ruspa, M; Fourletov, S; Martin, J F; Stewart, T P; Boutle, S K; Butterworth, J M; Gwenlan, C; Jones, T W; Loizides, J H; Wing, M; Brzozowska, B; Ciborowski, J; Grzelak, G; Kulinski, P; Luniak, P; Malka, J; Nowak, R J; Pawlak, zarnecki J M; Tymieniecka, T; Ukleja, A; Zarnecki, A F; Adamus, M; Plucinsky, P P; Eisenberg, Y; Hochman, D; Karshon, U; Brownson, E; Danielson, T; Everett, A; Kçira, D; Reeder, D D; Ryan, P; Savin, A A; Smith, W H; Wolfe, H; Bhadra, S; Catterall, C D; Cui, Y; Hartner, G; Menary, S; Noor, U; Standage, J; Whyte, J

    2008-01-01

    The production of excited charm, D_1(2420)^0 and D_2^*(2460)^0, and charm-strange, D_{s1}(2536)^+-, mesons in ep collisions was measured with the ZEUS detector at HERA using an integrated luminosity of 126 pb^-1. Masses, widths and helicity parameters were determined. The measured yields were converted to the rates of c quarks hadronising as a given excited charm meson and to the ratios of the dominant D_2^*(2460)^0 and D_{s1}(2536)^+- branching fractions. A search for the radially excited charm meson, D^{*'}(2640)^+-, was also performed. The results are compared with those measured previously and with theoretical expectations.

  2. Charmed Scalar Resonances

    CERN Document Server

    Terasaki, Kunihiko

    2008-01-01

    It is pointed out that assigning D_{s0}^+(2317) to an iso-triplet tetra-quark meson is favored by experiments. It also is discussed why its neutral and doubly charged partners have never been observed in inclusive e^+e^- annihilation. To search for them, hadronic weak decays of B mesons would be better, and their production rates, Br(B_u^+ -> D^-D_{s0}^{++}(2317)) and Br(B_d^0 ->antiD^0D_{s0}^{0}(2317)), would be around 10^{-3}.

  3. Nonleptonic weak decays of charmed mesons

    Science.gov (United States)

    Buccella, F.; Lusignoli, M.; Miele, G.; Pugliese, A.; Santorelli, P.

    1995-04-01

    A previous analysis of two-body Cabibbo-allowed nonleptonic decays of D0 mesons and of Cabibbo-allowed and first-forbidden decays of D+ and D+s has been adjourned using more recent experimental data and extended to the Cabibbo-forbidden decays of D0. Annihilation and W-exchange contributions as well as final state interaction effects (assumed to be dominated by nearby resonances) have been included and are in fact crucial to obtain a reasonable agreement with the experimental data, which show large flavor SU(3) violations. New fitting parameters are necessary to describe rescattering effects for Cabibbo-forbidden D0 decays, given the lack of experimental information on isoscalar resonances. We keep their number to a minimum, three, using phenomenologically based considerations. We also discuss CP-violating asymmetries.

  4. Nonleptonic weak decays of charmed mesons

    CERN Document Server

    Buccella, F; Miele, G; Pugliese, A; Santorelli, P; Buccella, F; Lusignoli, M; Miele, G; Pugliese, A; Santorelli, P

    1995-01-01

    A previous analysis of two-body Cabibbo allowed nonleptonic decays of D^0 mesons and of Cabibbo allowed and first-forbidden decays of D^+ and D_s^+ has been adjourned using more recent experimental data and extended to the Cabibbo forbidden decays of D^0. Annihilation and W-exchange contributions as well as final state interaction effects (assumed to be dominated by nearby resonances) have been included and are in fact crucial to obtain a reasonable agreement with the experimental data, which show large flavour SU(3) violations. New fitting parameters are necessary to describe rescattering effects for Cabibbo forbidden D^0 decays, given the lack of experimental informations on isoscalar resonances. We keep their number to a minimum - three - using phenomenologically based considerations. We also discuss CP violating asymmetries.

  5. Nonleptonic weak decays of charmed mesons

    International Nuclear Information System (INIS)

    A previous analysis of two-body Cabibbo-allowed nonleptonic decays of D0 mesons and of Cabibbo-allowed and first-forbidden decays of D+ and Ds+ has been adjourned using more recent experimental data and extended to the Cabibbo-forbidden decays of D0. Annihilation and W-exchange contributions as well as final state interaction effects (assumed to be dominated by nearby resonances) have been included and are in fact crucial to obtain a reasonable agreement with the experimental data, which show large flavor SU(3) violations. New fitting parameters are necessary to describe rescattering effects for Cabibbo-forbidden D0 decays, given the lack of experimental information on isoscalar resonances. We keep their number to a minimum, three, using phenomenologically based considerations. We also discuss CP-violating asymmetries

  6. Inclusive b Decays to Wrong Sign Charmed mesons

    CERN Document Server

    Abdallah, J; Adam, W; Adzic, P; Albrecht, T; Alderweireld, T; Alemany-Fernandez, R; Allmendinger, T; Allport, P P; Amaldi, Ugo; Amapane, N; Amato, S; Anashkin, E; Andreazza, A; Andringa, S; Anjos, N; Antilogus, P; Apel, W D; Arnoud, Y; Ask, S; Åsman, B; Augustin, J E; Augustinus, A; Baillon, Paul; Ballestrero, A; Bambade, P; Barbier, R; Bardin, Dimitri Yuri; Barker, G; Baroncelli, A; Battaglia, Marco; Baubillier, M; Becks, K H; Begalli, M; Behrmann, A; Ben-Haim, E; Benekos, N C; Benvenuti, Alberto C; Bérat, C; Berggren, M; Berntzon, L; Bertrand, D; Besançon, M; Besson, N; Bloch, D; Blom, M; Bluj, M; Bonesini, M; Boonekamp, M; Booth, P S L; Borisov, G; Botner, O; Bouquet, B; Bowcock, T J V; Boyko, I; Bracko, M; Brenner, R; Brodet, E; Brückman, P; Brunet, J M; Bugge, L; Buschmann, P; Calvi, M; Camporesi, T; Canale, V; Carena, F; Castro, N; Cavallo, F R; Chapkin, M M; Charpentier, P; Checchia, P; Chierici, R; Shlyapnikov, P; Chudoba, J; Chung, S U; Cieslik, K; Collins, P; Contri, R; Cosme, G; Cossutti, F; Costa, M J; Crawley, B; Crennell, D J; Cuevas-Maestro, J; D'Hondt, J; Dalmau, J; Da Silva, T; Da Silva, W; Della Ricca, G; De Angelis, A; de Boer, Wim; De Clercq, C; De Lotto, B; De Maria, N; De Min, A; De Paula, L S; Di Ciaccio, Lucia; Di Simone, A; Doroba, K; Drees, J; Dris, M; Eigen, G; Ekelöf, T J C; Ellert, M; Elsing, M; Espirito-Santo, M C; Fanourakis, G K; Fassouliotis, D; Feindt, M; Fernández, J; Ferrer, A; Ferro, F; Flagmeyer, U; Föth, H; Fokitis, E; Fulda-Quenzer, F; Fuster, J A; Gandelman, M; García, C; Gavillet, P; Gazis, E N; Geralis, T; Gokieli, R; Golob, B; Gómez-Ceballos, G; Gonçalves, P; Graziani, E; Grosdidier, G; Grzelak, K; Guy, J; Haag, C; Hallgren, A; Hamacher, K; Hamilton, K; Hansen, J; Haug, S; Hauler, F; Hedberg, V; Hennecke, M; Herr, H; Hoffman, J; Holmgren, S O; Holt, P J; Houlden, M A; Hultqvist, K; Jackson, J N; Jarlskog, G; Jarry, P; Jeans, D; Johansson, E K; Johansson, P D; Jonsson, P; Joram, C; Jungermann, L; Kapusta, F; Katsanevas, S; Katsoufis, E C; Kernel, G; Kersevan, Borut P; Kiiskinen, A P; King, B T; Kjaer, N J; Kluit, P; Kokkinias, P; Kourkoumelis, C; Kuznetsov, O; Krumshtein, Z; Kucharczyk, M; Lamsa, J; Leder, G; Ledroit, F; Leinonen, L; Leitner, R; Lemonne, J; Lepeltier, V; Lesiak, T; Liebig, W; Liko, D; Lipniacka, A; Lopes, J H; López, J M; Loukas, D; Lutz, P; Lyons, L; MacNaughton, J; Malek, A; Maltezos, S; Mandl, F; Marco, J; Marco, R; Maréchal, B; Margoni, M; Marin, J C; Mariotti, C; Markou, A; Martínez-Rivero, C; Masik, J; Mastroyiannopoulos, N; Matorras, F; Matteuzzi, C; Mazzucato, F; Mazzucato, M; McNulty, R; Meroni, C; Meyer, W T; Migliore, E; Mitaroff, W A; Mjörnmark, U; Moa, T; Moch, M; Mönig, K; Monge, R; Montenegro, J; Moraes, D; Moreno, S; Morettini, P; Müller, U; Münich, K; Mulders, M; Mundim, L M; Murray, W; Muryn, B; Myatt, Gerald; Myklebust, T; Nassiakou, M; Navarria, Francesco Luigi; Nawrocki, K; Nicolaidou, R; Nikolenko, M; Oblakowska-Mucha, A; Obraztsov, V F; Olshevskii, A G; Onofre, A; Orava, Risto; Österberg, K; Ouraou, A; Oyanguren, A; Paganoni, M; Paiano, S; Palacios, J P; Palka, H; Papadopoulou, T D; Pape, L; Parkes, C; Parodi, F; Parzefall, U; Passeri, A; Passon, O; Peralta, L; Perepelitsa, V F; Perrotta, A; Petrolini, A; Piedra, J; Pieri, L; Pierre, F; Pimenta, M; Piotto, E; Podobnik, T; Poireau, V; Pol, M E; Polok, G; Poropat, P; Pozdnyakov, V; Pukhaeva, N; Pullia, Antonio; Rames, J; Ramler, L; Read, A; Rebecchi, P; Rehn, J; Reid, D; Reinhardt, R; Renton, P B; Richard, F; Rídky, J; Rivero, M; Rodríguez, D; Romero, A; Ronchese, P; Rosenberg, E I; Roudeau, Patrick; Rovelli, T; Ruhlmann-Kleider, V; Ryabtchikov, D; Sadovskii, A; Salmi, L; Salt, J; Savoy-Navarro, A; Schwickerath, U; Schwanda, C; Segar, A; Sekulin, R L; Siebel, M; Sissakian, A N; Smadja, G; Smirnova, O G; Sokolov, A; Sopczak, A; Sosnowski, R; Spassoff, Tz; Stanitzki, M; Stocchi, A; Strauss, J; Stugu, B; Szczekowski, M; Szeptycka, M; Szumlak, T; Tabarelli de Fatis, T; Taffard, A C; Tegenfeldt, F; Timmermans, J; Tkatchev, L G; Tobin, M; Todorovova, S; Tomaradze, A G; Tomé, B; Tonazzo, A; Tortosa, P; Travnicek, P; Treille, D; Tristram, G; Trochimczuk, M; Troncon, C; Turluer, M L; Tyapkin, I A; Tyapkin, P; Tzamarias, S; Uvarov, V; Valenti, G; van Dam, P; Van Eldik, J; Van Lysebetten, A; Van Remortel, N; Van Vulpen, I B; Vegni, G; Veloso, F; Venus, W A; Verbeure, F; Verdier, P; Verzi, V; Vilanova, D; Vitale, L; Vrba, V; Wahlen, H; Washbrook, A J; Weiser, C; Wicke, D; Wickens, J H; Wilkinson, G; Winter, M; Witek, M; Yushchenko, O P; Zalewska-Bak, A; Zalewski, Piotr; Zavrtanik, D; Zimin, N I; Zinchenko, A I; Zupan, M

    2003-01-01

    The production of wrong sign charmed mesons b -> Dbar_(s)X, D_(s) = (D0, D+, Ds), is studied using the data collected by the DELPHI experiment in the years 1994 and 1995. Charmed mesons in Z -> bbbar events are exclusively reconstructed by searching for the decays D0 -> K-pi+, D+ -> K-pi+pi+ and D+_s -> phipi+ -> K+K-pi+. The wrong sign contribution is extracted by using two discriminant variables: the charge of the b-quark at decay time, estimated from the charges of identified particles, and the momentum of the charmed meson in the rest frame of the b-hadron. The inclusive branching fractions of b-hadrons into wrong sign charm mesons are measured to be: B(b -> Dbar0X) + B(b -> D^- X) = (9.3+- 1.7(stat) +- 1.3(syst) +- 0.4(B))%, B(b -> D^-_s X) = (10.1 +- 1.0(stat) +- 0.6(syst) +- 2.8(B))% where the first error is statistical, the second and third errors are systematic.

  7. Single and double charmed meson production at the LHC

    CERN Document Server

    Maciula, Rafal

    2014-01-01

    We discuss production of charmed mesons in proton-proton collisions at the LHC. The cross section for inclusive production of $c \\bar c$ pairs is calculated in the framework of the $k_{\\perp}$-factorization approach which effectively includes next-to-leading order corrections. Theoretical uncertainties of the model related to the choice of renormalization and factorization scales as well as due to the quark mass are discussed. Results of the $k_{\\perp}$-factorization approach are compared to NLO parton model predictions. The hadronization of charm quarks is included with the help of the Peterson fragmentation functions. Inclusive differential distributions in transverse momentum for several charmed mesons ($D^0$, $D^{\\pm}$, $D^{\\pm}_{S}$) are calculated and compared to recent results of the ALICE, ATLAS and LHCb collaborations. Furthermore, we also discuss production of two pairs of $c \\bar c$ within a simple formalism of double-parton scattering (DPS). Surprisingly large cross sections, comparable to single-...

  8. D-wave baryon resonances with charm from coupled-channel dynamics

    CERN Document Server

    Hofmann, J

    2006-01-01

    Identifying the zero-range exchange of vector mesons as the driving force for the s-wave scattering of pseudo-scalar mesons off the baryon ground states, the spectrum of ${3/2}^-$ molecules is computed. We predict a strongly bound 15-plet of $C=-1$ states. A narrow crypto-exotic octet of charm-zero states is foreseen. In the $C=+1$ sector a sextet of narrow resonances is formed due to the interaction of D mesons with the baryon decuplet. A strongly bound triplet of double-charm states is a consequence of coupled-channel dynamics driven by the D mesons.

  9. Dynamically generated hidden-charm baryon resonances

    CERN Document Server

    Lutz, M F M

    2006-01-01

    Identifying a zero-range exchange of vector mesons as the driving force for the s-wave scattering of pseudo-scalar mesons off the baryon ground states, a rich spectrum of hadronic nuclei is formed. We argue that chiral symmetry and large-$N_c$ considerations determine that part of the interaction which generates the spectrum. We suggest the existence of strongly bound crypto-exotic baryons, which contain a charm-anti-charm pair. Such states are narrow since they can decay only via OZI-violating processes.

  10. A-dependence for the charmed meson production

    International Nuclear Information System (INIS)

    A report is presented of a recent direct measurement of the nucleon number (λ) dependence of the production cross sections for the charmed mesons D0 and D+ using π+- beams incident on a segmented target of Be, Al, Cu and W. The data derive from the experiment E769 - Hadroproduction of Charm - at Fermilab. The experimental apparatus is described together with the following analysis. Starting from a sample of ∼ 1500 D mesons in the range of O F A = σO Aα, with α = 0.99 ± 0.03. The XF dependence of α is examined and the results obtained are compared with those of other experiments and with theoretical expectations based on perturbative QCD and on an EMC like model of nuclear shadowing. (author). 85 refs, 61 figs, 22 tabs

  11. Study of charm production through the decay of B mesons in the BABAR experiment

    International Nuclear Information System (INIS)

    The BABAR experiment, located at SLAC (Stanford, California), has been dedicated, since 1999, to the study of B meson decays produced in electron positron collisions with an energy in the center of mass frame equal to the mass of Ε(4S) resonance. In this experiment, the charged particles identification is provided, in particular by the measurement of the energy loss per length unit in the drift chamber. In order to improve the calibration of this quantity, a selection of electrons/positrons from radiative Bhabha events was performed; with the new sample the charge asymmetry in the charged particles reconstruction was reduced. In B meson decays, the inclusive production of charmed particles (D0, D0-bar, D±, Ds±, Λc±) is measured with a new analysis method, made possible by the large statistics accumulated by the BABAR experiment. B and B-bar mesons are produced simultaneously from the Ε(4S) resonance. The events are selected by reconstructing completely one B in a hadronic channel. Charmed particles from the other B are then reconstructed with the remaining tracks. This enables the measurement of the total number of charm produced in B+ and in B0 decays separating the correlated charm production (quark transitions: b → cX) from the anti-correlated production (quark transitions: b → c-bar X). The results obtained on an integrated luminosity of 210 fb-1 are the following: NcB+ = 0.970 ± 0.042; Nc-barB+ 0.262 ± 0.034; NcB0 = 0.950 ± 0.057; Nc-barB0 0.285 ± 0.048. This new method also allows the measurement of the momentum of the charmed particles in the B rest frame. Access to the different production mechanisms of these particles is thereby provided. (author)

  12. Charmed meson physics accessible to an L = 1033 cm-2 sec-1 e+e- collider operating near charm threshold

    International Nuclear Information System (INIS)

    In this report, the potential for dedicated charmed D0, D+ and Ds meson physics in a high-luminosity e+e- collider operated near charm threshold is explored. The construction of such a high-luminosity collider or Tau-Charm Factory in conjunction with a new detector whose design draws heavily on the extensive operational experience of previous detectors at SPEAR, could achieve three orders-of-magnitude improvement in sensitivity in most areas of charmed meson studies. 27 refs., 10 figs., 9 tabs

  13. Vacuum properties of open charmed mesons in a chiral symmetric model

    CERN Document Server

    Eshraim, Walaa I

    2014-01-01

    We present a $U(4)_R \\times U(4)_L$ chirally symmetric model, which in addition to scalar and pseudoscalar mesons also includes vector and axial-vector mesons. A part from the three new parameters pertaining to the charm degree of freedom, the parameters of the model are fixed from the $N_f=3$ flavor sector. We compute open charmed meson masses, weak decay constants, and the (OZI-dominant) strong decays of open charmed mesons. A precise description of decays of open charmed states is important for the CBM and PANDA experiments at the future FAIR facility.

  14. Experimental study of charm at LEP by the D* meson channel with ALEPH detector

    International Nuclear Information System (INIS)

    This research deals with the analysis of some 500 000 neutral Z bosons recorded with the ALEPH detector between 1989 and 1991. The physical subject concerns the study of charm at LEP and more precisely the production of charmed mesons, charged and excited: D*. Charged mesons are reconstructed in the channel with two pions and one kaon in the final state via the decay of neutral charmed one. We have measured simultaneously the ratio of D* meson production, the relative contribution of charm and beauty in D* meson production and the average fraction of the beam energy carried away by the D* meson at the time of its fragmentation. The charge asymmetry of charm has been also measured thanks to the high purity in charm events obtained by the D* tagging and finally allows us to infer the value of the electroweak mixing angle

  15. Contribution of hadronic intermediate states in nonleptonic weak decays of K, charm and B mesons

    International Nuclear Information System (INIS)

    We demonstrate that contributions of hadronic intermediate states are important in nonleptonic weak decays of K and charm mesons. Among various hadrons, exotic mesons can play an essential role in charm meson decays and also in the small violation of the so-called |ΔI| = 1/2 rule in K → ππ decays. The same technique is applied to B meson decays. (author)

  16. Lifetime measurements of charmed mesons with high resolution silicon detectors

    International Nuclear Information System (INIS)

    In this thesis an experiment is described to measure the lifetimes of pseudoscalar charmed mesons. The experiment uses a negatively charged unseparated hadron beam of 200 GeV. The experiment is carried out with a magnetic spectrometer preceded by a beam telescope, an active target and a vertex telescope, all consisting of Si microstrip detectors. The spectrometer consists of two spectrometer magnets, 48 planes of drift chambers and 3 Cerenkov hodoscopes for the determination and identification of charged secondaries. The lifetimes of the charmed mesons are determined by measuring the length of their flight path, their momentum and their mass. The results, which are described in the thesis, are based on the analysis of part of the collected data. The production rates in the K- beam and in the π- beam are found to be in the same order of magnitude within the xF range covered. Previous experimental data on the lifetimes of charmed particles are reviewed. A theoretical interpretation is presented of the measured decay properties. (Auth.)

  17. Two-Pion Decay Widths of Excited Charm Mesons

    CERN Document Server

    Lähde, T A

    2001-01-01

    The widths for $\\pi\\pi$ decay of the L=1 charm mesons are calculated by describing the pion coupling to light constituents quarks by the lowest order chiral interaction. The wavefunctions of the charm mesons are obtained as solutions to the covariant Blankenbecler-Sugar equation. These solutions correspond to an interaction Hamiltonian modeled as the sum of a linear scalar confining and a screened one-gluon exchange (OGE) interaction. This interaction induces a two-quark contribution to the amplitude for two-pion decay, which is found to interfere destructively with the single quark amplitude. For the currently known L=1 $D$ mesons, the total $\\pi\\pi$ decay widths are found to be $\\sim 1$ MeV for the $D_1(2420)$ and $\\sim 3$ MeV for the $D^*_2(2460)$ if the axial coupling of the constituent quark is taken to be $g_A^q=1$. The as yet undiscovered spin singlet $D_1^*$ state is predicted to have a larger width of 7 - 10 MeV for $\\pi\\pi$ decay.

  18. Diffusion of hidden charm mesons in hadronic medium

    Science.gov (United States)

    Mitra, Sukanya; Ghosh, Sabyasachi; Das, Santosh K.; Sarkar, Sourav; Alam, Jan-e.

    2016-07-01

    The drag and diffusion coefficients of a hot hadronic medium have been evaluated by using hidden charm mesons as probes. The scattering amplitudes required for the evaluation of these coefficients are calculated using an effective theory and scattering lengths obtained from lattice QCD calculations. It is found that although the magnitude of the transport coefficients are small their temperature variation is strong. The insignificant momentum diffusion of J / ψ in the hadronic medium keeps their momentum distribution largely unaltered. Therefore, the task of characterization of quark gluon plasma by using the observed suppression of J / ψ at high momentum will be comparatively easier.

  19. Study of the charmed mesons production at LEP with the ALEPH Detector; Etude de la production des mesons charmes au LEP avec le detecteur ALEPH

    Energy Technology Data Exchange (ETDEWEB)

    Boyer, C.

    1995-06-16

    This work describes two aspects of Charm Physics as one can undertake to do at LEP. The first aspect concerns the Charm production in the Z{sup 0} boson decay through the measurement of the c quark forward-backward asymmetry. The second is about the spectroscopy of charmed mesons via an excited states D{sup **} research. (author). 63 refs., 78 figs., 16 tabs.

  20. Meson Resonances from Lattice QCD

    Energy Technology Data Exchange (ETDEWEB)

    Edwards, Robert G. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

    2016-06-01

    There has been recent, significant, advances in the determination of the meson spectrum of QCD. Current efforts have focused on the development and application of finite-volume formalisms that allow for the determination of scattering amplitudes as well as resonance behavior in coupled channel systems. I will review some of these recent developments, and demonstrate the viability of the method in meson systems.

  1. Meson resonances on the lattice

    Energy Technology Data Exchange (ETDEWEB)

    Edwards, Robert G. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

    2016-06-01

    There has been recent, significant, advances in the determination of the meson spectrum of QCD. Current efforts have focused on the development and application of finite-volume formalisms that allow for the determination of scattering amplitudes as well as resonance behavior in coupled channel systems. I will review some of these recent developments, and demonstrate the viability of the method in meson systems

  2. On the Role of Charmed Meson Loops in Charmonium Decays

    CERN Document Server

    Mehen, Thomas

    2011-01-01

    We investigate the effect of intermediate charmed meson loops on the M1 radiative decays $J/\\psi \\to \\eta_c \\gamma$ and $\\psi'\\rightarrow\\eta^{(\\prime)}_c\\gamma$ as well as the isospin violating hadronic decays $\\psi'\\rightarrow J/\\psi \\,\\pi^0(\\eta)$ using heavy hadron chiral perturbation theory (HH$\\chi$PT). The calculations include tree level as well as one loop diagrams and are compared to the latest data from CLEO and BES-III. Our fit constrains the couplings of 1S and 2S charmonium multiplets to charmed mesons, denoted $g_2$ and $g_2^\\prime$, respectively. We find that there are two sets of solutions for $g_2$ and $g_2^\\prime$. One set, which agrees with previous values of the product $g_2 g_2^\\prime$ extracted from analyses that consider only loop contributions to $\\psi'\\rightarrow J/\\psi \\,\\pi^0(\\eta)$, can only fit data on radiative decays with fine-tuned cancellations between tree level diagrams and loops in that process. The other solution for $g_2$ and $g_2^\\prime$ leads to couplings that are small...

  3. Ds1∗(2860) and Ds3∗(2860): candidates for 1D charmed-strange mesons

    International Nuclear Information System (INIS)

    Newly observed two charmed-strange resonances, Ds1∗(2860) and Ds3∗(2860), are investigated by calculating their Okubo–Zweig–Iizuka-allowed strong decays, which shows that they are suitable candidates for the 13D1 and 13D3 states in the charmed-strange meson family. Our study also predicts other main decay modes of Ds1∗(2860) and Ds3∗(2860), which can be accessible at the future experiment. In addition, the decay behaviors of the spin partners of Ds1∗(2860) and Ds3∗(2860), i.e., 1D(2-) and 1D′(2-), are predicted in this work, which are still missing at present. The experimental search for the missing 1D(2-) and 1D′(2-) charmed-strange mesons is an intriguing and challenging task for further experiments

  4. In Medium Properties of Charmed Strange Mesons in Dense Hadron ic Matter

    Science.gov (United States)

    Kumar, Sushil

    2015-05-01

    The medium modifications of the charmed strange mesons in the dense hadronic matter are investigated within chiral S U(4) model. The charmed strange meson properties modifies due to their interactions with the nucleons, hyperons and the scalar mesons (scalar-isoscalar mesons ( σ, ζ), scalar isovector meson ( δ)) in the dense hadronic medium. The various parameters used in the chiral model are obtained by fitting the vacuum baryon masses and saturation properties of nuclear matter. The non-linear coupled equations of the scalar fields are solved to obtain their baryon density, isospin and strangeness dependent values. Furthermore, the dispersion relations are derived for charmed strange mesons. Effects of isospin asymmetry and strangeness on the energies of charmed strange mesons are investigated. The in medium properties of charmed strange mesons can be particularly relevant to the experiments with neutron rich beams at the Facility for Antiproton and Ion Research (FAIR) at GSI, Germany, as well as to experiments at the Rare Isotope Accelerator (RIA) laboratory, USA. The present study of the in medium properties of charmed strange mesons will be of direct relevance for the observables from the compressed baryonic matter, resulting from the heavy ion collision experiments.

  5. Study of the doubly-charmed decays of B mesons with the experiment BABAR in SLAC

    International Nuclear Information System (INIS)

    The BABAR experiment at SLAC (Stanford linear acceleration center) has been studying since 1999 B meson decays from e+e- collisions at the γ(4S) resonance. The first goal of the collaboration was to measure the sin (2β) CP-violation parameter within the standard model. This measurement requires to know with precision the absolute length scale of the detector. A method to test this scale was developed using nuclear interactions in the beam-pipe material. The longitudinal length scale was then determined at the 1 % level precision. The systematic error associated with length measurement in the detector concerning B meson lifetime and B meson oscillation frequency is then negligible with respect to the other errors. The K meson content of B decays is a key ingredient of the sin (2β) measurement and is used to tag the flavour of the other B in events containing a B decaying to a CP eigenstate. The K charge is correlated to the B flavour. Wrong sign kaons, which can dilute B tagging, can come from wrong sign D decays (B→ DX). Doubly charmed decays (B→ D(*)D-bar(*) K are one possibility to produce wrong sign D decays. The twenty-two decay modes are reconstructed exclusively. The total branching fraction is measured with enough precision to establish that B→ D(*)D-bar(*) K decays are not the only source of wrong sign D mesons in B decays. (author)

  6. Search for T Violation in Charm Meson Decays

    CERN Document Server

    Link, J M; Anjos, J C; Bediaga, I; Castromonte, C; Machado, A A; Magnin, J; Massafferri, A; De Miranda, J M; Pepe, I M; Polycarpo, E; Dos Reis, A C; Carrillo, S; Casimiro, E; Cuautle, E; Sánchez-Hernández, A; Uribe, C; Vázquez, F; Agostino, L; Cinquini, L; Cumalat, J P; O'Reilly, B; Segoni, I; Stenson, K; Butler, J N; Cheung, H W K; Chiodini, G; Gaines, I; Garbincius, P H; Garren, L A; Gottschalk, E; Kasper, P H; Kreymer, A E; Kutschke, R; Wang, M; Benussi, L; Bertani, M; Bianco, S; Fabbri, F L; Pacetti, S; Zallo, A; Reyes, M; Cawlfield, C; Kim, D Y; Rahimi, A; Wiss, J; Gardner, R; Kryemadhi, A; Chung, Y S; Kang, J S; Ko, B R; Kwak, J W; Lee, K B; Cho, K; Park, H; Alimonti, G; Barberis, S; Boschini, M; Cerutti, A; D'Angelo, P; Di Corato, M; Dini, P; Edera, L; Erba, S; Inzani, P; Leveraro, F; Malvezzi, S; Menasce, D; Mezzadri, M; Moroni, L; Pedrini, D; Pontoglio, C; Prelz, F; Rovere, M; Sala, S; Davenport, T F; Arena, V; Boca, G; Bonomi, G; Gianini, G; Liguori, G; Lopes-Pegna, D; Merlo, M M; Pantea, D; Ratti, S P; Riccardi, C; Vitulo, P; Göbel, C; Hernández, H; López, A M; Méndez, H; Paris, A; Quinones, J; Ramírez, J E; Zhang, Y; Wilson, J R; Handler, T; Mitchell, R; Engh, D; Hosack, M; Johns, W E; Luiggi, E; Moore, J E; Nehring, M; Sheldon, P D; Vaandering, E W; Webster, M; Sheaff, M

    2005-01-01

    Using data from the FOCUS (E831) experiment, we have searched for T violation in charm meson decays using the four-body decay channels $D^0 \\to K^-K^+\\pi^-\\pi^+$, $D^+ \\to K^0_SK^+\\pi^-\\pi^+$, and $D^+_s \\to K^0_SK^+\\pi^-\\pi^+$. The T violation asymmetry is obtained using triple-product correlations and assuming the validity of the CPT theorem. We find the asymmetry values to be $A_Tviol (D^0) = 0.010 \\pm 0.057(stat.) \\pm 0.037(syst.)$, $A_Tviol (D^+) = 0.023 \\pm 0.062(stat.) \\pm 0.022(syst.)$, and $A_Tviol (D^+_s) = -0.036 \\pm 0.067(stat.) \\pm 0.023(syst.)$. Each measurement is consistent with no T violation. New measurements of the CP asymmetries for some of these decay modes are also presented.

  7. Inclusive photoproduction of charmed hadrons in the meson vector dominance model

    Energy Technology Data Exchange (ETDEWEB)

    Likhoded, A.K.; Slabospitskij, S.R.; Tolstenkov, A.N. (Gosudarstvennyj Komitet po Ispol' zovaniyu Atomnoj Ehnergii SSSR, Serpukhov. Inst. Fiziki Vysokikh Ehnergij)

    1982-05-01

    On basis of meson vector dominance model, together with the ''fusion'' model, a mechanism is proposed for the photoproduction of charmed hadrons. In framework of the mechanism pre-- sented, the total cross sections and the inclusive spectra of charmed hadro produced in ..gamma..N ineractions are calculated. According to the thoreical estimates obtained, at low energies the anti D-meson yields are higher than the D-meson yields, That is relevant to the associated production of anti D mesons and ..lambda..sub(c) baryons.

  8. Inclusive photoproduction of charmed hadrons in the meson vector dominance model

    International Nuclear Information System (INIS)

    On basis of meson vector dominance model, together with the ''fusion'' model, a mechanism is proposed for the photoproduction of charmed hadrons. In framework of the mechanism pre-- sented, the total cross sections and the inclusive spectra of charmed hadro produced in γN ineractions are calculated. According to the thoreical estimates obtained, at low energies the anti D-meson yields are higher than the D-meson yields, That is relevant to the associated production of anti D mesons and Λsub(c) baryons

  9. Charmed and strange pseudoscalar meson decay constants from HISQ simulations

    CERN Document Server

    Bazavov, A; Bouchard, C; DeTar, C; Du, D; El-Khadra, A X; Foley, J; Freeland, E D; Gamiz, E; Gottlieb, Steven; Heller, U M; Kim, J; Komijani, J; Kronfeld, A S; Laiho, J; Levkova, L; Mackenzie, P B; Neil, E T; Simone, J N; Sugar, R L; Toussaint, D; Van de Water, R S; Zhou, R

    2013-01-01

    We update our determinations of $f_{D^+}$, $f_{D_s}$, $f_K$, and quark mass ratios from simulations with four flavors of HISQ dynamical quarks. The availability of ensembles with light quarks near their physical mass means that we can extract physical results with only small corrections for valence- and sea-quark mass mistunings instead of a chiral extrapolation. The adjusted valence-quark masses and lattice spacings may be determined from an ensemble-by-ensemble analysis, and the results for the quark mass ratios then extrapolated to the continuum limit. Our central values of the charmed meson decay constants, however, come from an alternative analysis, which uses staggered chiral perturbation theory for the heavy-light mesons, and allows us to incorporate data at unphysical quark masses where statistical errors are often smaller. A jackknife analysis propagated through all of these steps takes account of the correlations among all the quantities used in the analysis. Systematic errors from the finite spatia...

  10. Heavy-flavor correlation measurements via electron azimuthal correlations with open charm mesons

    OpenAIRE

    Mischke, A.; Abelev, B. I.; Benedosso, F.; Botje, M.A.J.; Braidot, E.; Peitzmann, T.(Institute for Subatomic Physics of Utrecht University, Utrecht, Netherlands); Russcher, M. J.; Snellings, R. J M; van der Kolk, N.

    2008-01-01

    We report the first STAR measurement on two heavy-flavor particle correlations in p+p collisions at RHIC. Heavy-flavor (charm and bottom) events are identified and separated on a statistical basis by the azimuthal correlation of their decay electrons and open charm mesons, which yield important information about the underlying production mechanism. The azimuthal correlation distribution exhibits a two-peak structure which can be attributed to B decays on the near-side and predominantly charm ...

  11. Investigation of Semileptonic B Meson Decays to p -Wave Charm Mesons

    International Nuclear Information System (INIS)

    We have studied semileptonic B meson decays with a p -wave charm meson in the final state using 3.29x106 BB events collected with the CLEOII detector at the Cornell Electron-Positron Storage Ring. We find a value for the exclusive semileptonic product branching fraction B(B-→D01 ell -νell) B(D01→D*+ π-)=(0.373±0.085± 0.052±0.024)% and an upper limit for B(B-→D*02 ell -νell) B(D*02→D*+ π-)2 spectrum for B-→D01 ell - νell . copyright 1998 The American Physical Society

  12. Study of Hadronic Five-Body Decays of Charmed Mesons

    OpenAIRE

    Wahl, M; Collaboration, for the FOCUS

    2002-01-01

    We study the decay of D+ and Ds+ mesons into charged five body final states, and report the discovery of the decay mode D+ -> K+K-Pi+Pi+Pi-, as well as measurements of the decay modes D+ -> K-Pi+Pi+Pi+Pi-, Ds+ -> K+K-Pi+Pi+Pi-, Ds+ -> PhiPi+Pi+Pi- and D+/Ds+ -> Pi+Pi+Pi+Pi-Pi-. An analysis of the resonant substructure is also included, with evidence suggesting that both decays proceed primarily through an a1 vector resonance.

  13. Quenched Charmed Meson Spectra Using Tadpole Improved Quark Action on Anisotropic Lattices

    Institute of Scientific and Technical Information of China (English)

    LIU Liu-Ming; SU Shi-Quan; LI Xin; LIU Chuan

    2005-01-01

    @@ Charmed meson charmonium spectra are studied with improved quark actions on anisotropic lattices. We measured the pseudo-scalar and vector meson dispersion relations for four lowest lattice momentum modes with quark mass values ranging from the strange quark to charm quark with three different values of gauge coupling β and four different values of bare speed of light v. With the bare speed of light parameter v tuned in a mass-dependent way, we study the mass spectra of D, Ds, ηc, D*, Ds* and J/ψ mesons. The results extrapolated to the continuum limit are compared with the experiment, and a qualitative agreement is found.

  14. Inclusive photoproduction of charmed hadrons in the model of vector-meson dominance

    Energy Technology Data Exchange (ETDEWEB)

    Likhoded, A.K.; Slabospitskii, S.R.; Tolstenkov, A.N.

    1982-05-01

    On the basis of the vector-dominance model supplemented with the fusion model, a mechanism for photoproduction of charmed hadrons is proposed. In the framework of this mechanism, the total cross sections and inclusive spectra of charmed hadrons in ..gamma..N interactions are calculated. According to the theoretical estimates that are obtained, at low energies the yields of D-bar mesons exceed the yields of D mesons; this is due to pair production of D-bar mesons and ..lambda../sub c/ baryons.

  15. Inclusive photoproduction of charmed hadrons in the model of vector-meson dominance

    International Nuclear Information System (INIS)

    On the basis of the vector-dominance model supplemented with the fusion model, a mechanism for photoproduction of charmed hadrons is proposed. In the framework of this mechanism, the total cross sections and inclusive spectra of charmed hadrons in γN interactions are calculated. According to the theoretical estimates that are obtained, at low energies the yields of D-bar mesons exceed the yields of D mesons; this is due to pair production of D-bar mesons and Λ/sub c/ baryons

  16. Decays of open charmed mesons in the extended Linear Sigma Model

    Directory of Open Access Journals (Sweden)

    Eshraim Walaa I.

    2014-01-01

    Full Text Available We enlarge the so-called extended linear Sigma model (eLSM by including the charm quark according to the global U(4r × U(4l chiral symmetry. In the eLSM, besides scalar and pseudoscalar mesons, also vector and axial-vector mesons are present. Almost all the parameters of the model were fixed in a previous study of mesons below 2 GeV. In the extension to the four-flavor case, only three additional parameters (all of them related to the bare mass of the charm quark appear.We compute the (OZI dominant strong decays of open charmed mesons. The results are compatible with the experimental data, although the theoretical uncertainties are still large.

  17. Heavy meson in nuclear medium

    CERN Document Server

    Tolos, L; Garcia-Recio, C; Molina, R; Nieves, J; Oset, E; Ramos, A

    2010-01-01

    The properties of charmed mesons in dense matter are studied using a unitary coupled-channel approach in the nuclear medium which takes into account Pauli-blocking effects and meson self-energies in a self-consistent manner. We obtain the open-charm meson spectral functions in this dense nuclear environment, and discuss their implications on hidden charm and charm scalar resonances and on the formation of $D$-mesic nuclei at FAIR.

  18. Search for T violation in charm meson decays

    Energy Technology Data Exchange (ETDEWEB)

    Link, J.M.; Yager, P.M.; /UC, Davis; Anjos, J.C.; Bediaga, I.; Castromonte, C.; Machado, A.A.; Magnin, J.; Massafferri, A.; de Miranda, J.M.; Pepe, I.M.; Polycarpo, E.; dos Reis, A.C.; /Rio de Janeiro, CBPF; Carrillo, S.; Casimiro, E.; Cuautle, E.; Sanchez-Hernandez, A.; Uribe, C.; Vazquez, F.; /CINVESTAV, IPN; Agostino, L.; Cinquini, L.; Cumalat,; /Colorado U. /Fermilab /Frascati /Guanajuato U. /Illinois U., Urbana /Indiana U. /Korea U. /Kyungpook Natl. U. /INFN, Milan /Milan U. /North Carolina U. /Pavia U. /INFN,

    2005-06-01

    Using data from the FOCUS (E831) experiment, they have searched for T violation in charm meson decays using the four-body decay channels D{sup 0} {yields} K{sup -}K{sup +} {pi}{sup -}{pi}{sup +}, D{sup +} {yields} K{sub S}{sup 0}K{sup +}{pi}{sup -}{pi}{sup +}, and D{sub s}{sup +} {yields} K{sub S}{sup 0}K{sup +}{pi}{sup -}{pi}{sup +}. The T violation asymmetry is obtained using triple-product correlations and assuming the validity of the CPT theorem. They find the asymmetry values to be A{sub T{sub viol}}(D{sup 0}) = 0.010 {+-} 0.057(stat.) {+-} 0.037(syst.), A{sub T{sub viol}}(D{sup +}) = 0.023 {+-} 0.062(stat.) {+-} 0.022(syst.), and A{sub T{sub viol}}(D{sub s}{sup +}) = -0.036 {+-} 0.067(stat.) {+-} 0.023(syst.). Each measurement is consistent with no T violation. New measurements of the CP asymmetries for some of these decay modes are also presented.

  19. Strong decays of the charmed mesons $D_1^*(2680)$, $D^*_3(2760)$, $D_2^*(3000)$

    CERN Document Server

    Wang, Zhi-Gang

    2016-01-01

    In this article, we assign the higher charmed mesons $D^*_1(2680)$, $D_3^*(2760)$ and $D_2^*(3000)$ to be the 2S $1^-$, 1D $3^-$ and 1F $2^+$ states, respectively, and study the two-body strong decays to the ground state charmed mesons and light pseudoscalar mesons with the heavy meson effective theory. We obtain the ratios among the strong decays, which can be confronted to the experimental data in the future and shed light on the nature of those higher charmed mesons.

  20. Nonleptonic charmed-meson decays: quark diagrams and final-state interactions

    International Nuclear Information System (INIS)

    Effect of final-state interactions in nonleptonic decays of charmed mesons are studied in the framework of quark-diagram approach. For the case of u-d-s flavour symmetry we discuss how the inelastic coupled-channel rescattering effects (and, in particular, resonance formation in the final state) modify the input quark-diagram weak amplitudes. It is shown that such inelastic effects lead to the appearance of nonzero relative phases between various quark diagrams, thus invalidating some of the conclusions drawn in the past within the diagrammatical approach. The case of SU(3) symmetry-breaking in Cabibbo once-forbidden D0 decays is also studied in some detail. (author). 21 refs, 4 figs, 1 tab

  1. Thermal and non-thermal charmed meson production in heavy ions collisions at the LHC

    CERN Document Server

    Lokhtin, I P; Eyyubova, G Kh; Ponimatkin, G; Pronina, E Yu

    2015-01-01

    The phenomenological analysis of the LHC data on transverse momentum spectrum and elliptic flow of $J/\\psi$ and D mesons in PbPb collisions at center-of-mass energy 2.76 TeV per nucleon pair is presented. The charmed meson production pattern in PbPb collisions may be reproduced by two-component model HYDJET++ including thermal and non-thermal components. The significant part of D-mesons is found to be in a kinetic equilibrium with the created medium, while $J/\\psi$-mesons are not.

  2. Model-Independent Analysis of CP Violation in Charmed Meson Decays

    CERN Document Server

    Dhir, Rohit; Oh, Sechul

    2015-01-01

    We present a model-independent analysis of CP violation, inspired by recent experimental observations, in charmed meson decays. The topological diagram approach is used to study direct CP asymmetries for singly Cabibbo-suppressed two-body hadronic decays of charmed mesons. We extract the magnitudes and relative phases of the corresponding topological amplitudes from available experimental information. In order to get more precise and reliable estimates of direct CP asymmetries, we take into account contributions from all possible strong penguin amplitudes, including the internal $b$-quark penguin contributions. We also study flavor SU(3) symmetry breaking effects in these decay modes and consequently, predict direct CP asymmetries of unmeasured modes.

  3. Ground state charmed meson spectra for N_f=2+1+1

    CERN Document Server

    Rae, T D

    2015-01-01

    We present a preliminary study of the charmed meson spectra using the electrically neutral subset of the new Budapest-Marseille-Wuppertal N_f=2+1+1 gauge configurations that utilise the 3-HEX smeared clover action. The analysis is performed with a focus on the hyperfine splitting.

  4. Study of charm production through the decay of B mesons in the BABAR experiment; Etude de la production de charme dans les desintegrations des mesons beaux avec l'experience BABAR

    Energy Technology Data Exchange (ETDEWEB)

    Couderc, F

    2005-04-15

    The BABAR experiment, located at SLAC (Stanford, California), has been dedicated, since 1999, to the study of B meson decays produced in electron positron collisions with an energy in the center of mass frame equal to the mass of {epsilon}(4S) resonance. In this experiment, the charged particles identification is provided, in particular by the measurement of the energy loss per length unit in the drift chamber. In order to improve the calibration of this quantity, a selection of electrons/positrons from radiative Bhabha events was performed; with the new sample the charge asymmetry in the charged particles reconstruction was reduced. In B meson decays, the inclusive production of charmed particles (D{sup 0}, D{sup 0}-bar, D{sup {+-}}, D{sub s}{sup {+-}}, {lambda}{sub c}{sup {+-}}) is measured with a new analysis method, made possible by the large statistics accumulated by the BABAR experiment. B and B-bar mesons are produced simultaneously from the {epsilon}(4S) resonance. The events are selected by reconstructing completely one B in a hadronic channel. Charmed particles from the other B are then reconstructed with the remaining tracks. This enables the measurement of the total number of charm produced in B{sup +} and in B{sup 0} decays separating the correlated charm production (quark transitions: b {yields} cX) from the anti-correlated production (quark transitions: b {yields} c-bar X). The results obtained on an integrated luminosity of 210 fb{sup -1} are the following: N{sub c}{sup B{sup +}} = 0.970 {+-} 0.042; N{sub c-}bar{sup B{sup +}} 0.262 {+-} 0.034; N{sub c}{sup B{sup 0}} = 0.950 {+-} 0.057; N{sub c-}bar{sup B{sup 0}} 0.285 {+-} 0.048. This new method also allows the measurement of the momentum of the charmed particles in the B rest frame. Access to the different production mechanisms of these particles is thereby provided. (author)

  5. Study of B-Meson Decays to Final States with a Single Charm Baryon

    Energy Technology Data Exchange (ETDEWEB)

    Majewski, Stephanie A. [Stanford Univ., CA (United States)

    2007-08-01

    A study of B-meson decays to final states with a single charm baryon is presented based on data recorded by the BABAR detector at the Stanford Linear Accelerator Center. Although the B meson is the lightest bottom-flavored meson, it is heavy enough to decay to a baryon made of three quarks and an antibaryon made of three antiquarks. By studying the baryonic weak decays of the B meson, we can investigate baryon production mechanisms in heavy meson decays. In particular, we measure the rates of the decays B- → Λ+c$\\bar{p}$π- and $\\bar{B}$0 → Λ+c$\\bar{p}$. Comparing these rates, we confirm an observed trend in baryonic B decays that the decay with the lower energy release, B- → Λ+c$\\bar{p}$π-, is favored over $\\bar{B}$0 → Λ+c$\\bar{p}$. The dynamics of the baryon-antibaryon (Λ+c$\\bar{p}$) system in the three-body decay also provide insight into baryon-antibaryon production mechanisms. The B- → Λ+c$\\bar{p}$π- system is a laboratory for searches for excited #c baryon states; we observe the resonant decays B- → Σc(2455) 0$\\bar{p}$ and B- → Σc(2800) 0$\\bar{p}$. This is the first observation of the decay B- → Σc(2800) 0$\\bar{p}$; however, the mass of the observed #c(2800)0 state is inconsistent with previous measurements. Finally, we examine the angular distribution of the B- → Σc(2455) 0$\\bar{p}$ decays and measure the spin of the B- → Σc(2455) 0$\\bar{p}$ baryon to be J = 1/2, as predicted by the quark model.

  6. Study of Charm Fragmentation into $D^{*\\pm}$ Mesons in Deep-Inelastic Scattering at HERA

    CERN Document Server

    Aaron, F D; Andreev, V; Antunovic, B; Aplin, S; Asmone, A; Astvatsatourov, A; Bacchetta, A; Backovic, S; Baghdasaryan, A; Barrelet, E; Bartel, W; Beckingham, M; Begzsuren, K; Behnke, O; Belousov, A; Berger, N; Bizot, J C; Boenig, M O; Boudry, V; Bozovic-Jelisavcic, I; Bracinik, J; Brandt, G; Brinkmann, M; Brisson, V; Bruncko, D; Bunyatyan, A; Buschhorn, G; Bystritskaya, L; Campbell, A J; Cantun Avila, K B; Cassol-Brunner, F; Cerny, K; Cerny, V; Chekelian, V; Cholewa, A; Contreras, J G; Coughlan, J A; Cozzika, G; Cvach, J; Dainton, J B; Daum, K; Deak, M; de Boer, Y; Delcourt, B; Del Degan, M; Delvax, J; De Roeck, A; De Wolf, E A; Diaconu, C; Dodonov, V; Dossanov, A; Dubak, A; Eckerlin, G; Efremenko, V; Egli, S; Eliseev, A; Elsen, E; Essenov, S; Falkiewicz, A; Faulkner, P J W; Favart, L; Fedotov, A; Felst, R; Feltesse, J; Ferencei, J; Fleischer, M; Fomenko, A; Gabathuler, E; Gayler, J; Ghazaryan, S; Glazov, A; Glushkov, I; Goerlich, L; Goettlich, M; Gogitidze, N; Gouzevitch, M; Grab, C; Greenshaw, T; Grell, B R; Grindhammer, G; Habib, S; Haidt, D; Hansson, M; Helebrant, C; Henderson, R C W; Hennekemper, E; Henschel, H; Herrera, G; Hildebrandt, M; Hiller, K H; Hoffmann, D; Horisberger, R; Hovhannisyan, A; Hreus, T; Jacquet, M; Janssen, M E; Janssen, X; Jemanov, V; Jonsson, L; Jung, Andreas Werner; Jung, H; Kapichine, M; Katzy, J; Kenyon, I R; Kiesling, C; Klein, M; Kleinwort, C; Klimkovich, T; Kluge, T; Knutsson, A; Kogler, R; Korbel, V; Kostka, P; Kraemer, M; Krastev, K; Kretzschmar, J; Kropivnitskaya, A; Kruger, K; Kutak, K; Landon, M P J; Lange, W; Lastovicka-Medin, G; Laycock, P; Lebedev, A; Leibenguth, G; Lendermann, V; Levonian, S; Li, G; Lipka, K; Liptaj, A; List, B; List, J; Loktionova, N; Lopez-Fernandez, R; Lubimov, V; Lucaci-Timoce, A I; Lytkin, L; Makankine, A; Malinovski, E; Marage, P; Marti, Ll; Martyn, H U; Maxfield, S J; Mehta, A; Meier, K; Meyer, A B; Meyer, H; Meyer, H; Meyer, J; Michels, V; Mikocki, S; Milcewicz-Mika, I; Moreau, F; Morozov, A; Morris, J V; Mozer, Matthias Ulrich; Mudrinic, M; Muller, K; Murin, P; Nankov, K; Naroska, B; Naumann, Th; Newman, Paul R; Niebuhr, C; Nikiforov, A; Nowak, G; Nowak, K; Nozicka, M; Olivier, B; Olsson, J E; Osman, S; Ozerov, D; Palichik, V; Panagoulias, I; Pandurovic, M; Papadopoulou, Th; Pascaud, C; Patel, G.D; Pejchal, O; Peng, H; Perez, E; Petrukhin, A; Picuric, I; Piec, S; Pitzl, D; Placakyte, R; Polifka, R; Povh, B; Preda, T; Radescu, V; Rahmat, A J; Raicevic, N; Raspiareza, A; Ravdandorj, T; Reimer, P; Rizvi, E; Robmann, P; Roland, B; Roosen, R; Rostovtsev, A; Rotaru, M; Ruiz Tabasco, J E; Rurikova, Z; Rusakov, S; Salek, D; Salvaire, F; Sankey, D P C; Sauter, M; Sauvan, E; Schmidt, S; Schmitt, S; Schmitz, C; Schoeffel, L; Schoning, A; Schultz-Coulon, H C; Sefkow, F; Shaw-West, R N; Sheviakov, I; Shtarkov, L N; Shushkevich, S; Sloan, T; Smiljanic, Ivan; Smirnov, P; Soloviev, Y; Sopicki, P; South, D; Spaskov, V; Specka, Arnd E; Staykova, Z; Steder, M; Stella, B; Straumann, U; Sunar, D; Sykora, T; Tchoulakov, V; Thompson, G; Thompson, P.D; Toll, T; Tomasz, F; Tran, T H; Traynor, D; Trinh, T N; Truol, P; Tsakov, I; Tseepeldorj, B; Tsurin, I; Turnau, J; Tzamariudaki, E; Urban, K; Valkarova, A; Vallee, C; Van Mechelen, P; Vargas Trevino, A; Vazdik, Y; Vinokurova, S; Volchinski, V; Wegener, D; Wessels, M; Wissing, Ch; Wunsch, E; Yeganov, V; Zacek, J; Zalesak, J; Zhang, Z; Zhelezov, A; Zhokin, A; Zhu, Y C; Zimmermann, T; Zohrabyan, H; Zomer, F

    2009-01-01

    The process of charm quark fragmentation is studied using $D^{*\\pm}$ meson production in deep-inelastic scattering as measured by the H1 detector at HERA. Two different regions of phase space are investigated defined by the presence or absence of a jet containing the $D^{*\\pm}$ meson in the event. The parameters of fragmentation functions are extracted for QCD models based on leading order matrix elements and DGLAP or CCFM evolution of partons together with string fragmentation and particle decays. Additionally, they are determined for a next-to-leading order QCD calculation in the fixed flavour number scheme using the independent fragmentation of charm quarks to $D^{*\\pm}$ mesons.

  7. Study of charm fragmentation into D{sup *{+-}} mesons in deep-inelastic scattering at HERA

    Energy Technology Data Exchange (ETDEWEB)

    Aaron, F.D. [National Institute for Physics and Nuclear Engineering (NIPNE), Bucharest (Romania)]|[Bucharest Univ. (Romania). Fac. of Physics; Alexa, C. [National Institute for Physics and Nuclear Engineering (NIPNE), Bucharest (Romania); Andreev, V. [Lebedev Physical Institute, Moscow (RU)] (and others)

    2008-07-15

    The process of charm quark fragmentation is studied using D{sup *{+-}} meson production in deep-inelastic scattering as measured by the H1 detector at HERA. Two different regions of phase space are investigated defined by the presence or absence of a jet containing the D{sup *{+-}} meson in the event. The parameters of fragmentation functions are extracted for QCD models based on leading order matrix elements and DGLAP or CCFM evolution of partons together with string fragmentation and particle decays. Additionally, they are determined for a next-to-leading order QCD calculation in the fixed flavour number scheme using the independent fragmentation of charm quarks to D{sup *{+-}} mesons. (orig.)

  8. Role of Resonances in Heavy Meson Processes within Standard Model and Beyond

    CERN Document Server

    Kamenik, Jernej F

    2007-01-01

    The effective theory based on combined chiral and heavy quark symmetry, the heavy meson chiral perturbation theory, is applied to studying the role of resonances in various processes of heavy mesons within and beyond the Standard Model. Chiral corrections including both positive and negative parity heavy meson doublets are calculated to the effective strong couplings featuring in the effective theory leading order interaction Lagrangian, to the Isgur-Wise functions in semileptonic B to D decays and to the complete set of supersymmetric four-quark operators mediating heavy neutral meson mixing. Bare values of the effective strong couplings are extracted from the measured decay widths of charmed resonances. Chiral behavior of the couplings, Isgur-Wise functions and heavy meson bag parameters is studied in the leading logarithmic approximation. In semileptonic heavy to light decays we determine resonance contributions to the various form factors within an effective theory inspired model at zero recoil. We employ...

  9. Strong decay widths and coupling constants of recent charm meson states

    Energy Technology Data Exchange (ETDEWEB)

    Batra, Meenakshi; Upadhayay, Alka [Thapar University, School of Physics and Material Science, Patiala (India)

    2015-07-15

    Open charm hadrons with strange and non-strange mesons have been discovered in recent years. We study the spectra of several newly observed resonances by different collaborations like BaBar (del Amo Sanchez et al., Phys Rev D 82:111101, 2010) and LHCb (Aaij et al. [LHCb Collaboration], J High Energy Phys 1309:145, 2013) etc. Using an effective Lagrangian approach based on heavy quark symmetry and chiral dynamics, we explore the strong decay widths and branching ratios of various resonances and suggest their J{sup p} values. We try to fit the experimental data to find the coupling constants involved in the strong decays through pseudo-scalar mesons. The present work also discusses the possible spin-parity assignments of recently observed states by the LHCb Collaboration. The tentative assignment of the newly discovered state D{sub J}{sup *}(3000) can be by natural parity states (0{sup +},1{sup -},2{sup +},3{sup -},..), while D{sub J}(3000) can be identified with unnatural parity states like (0{sup +},1{sup -},2{sup +},3{sup -},..). Therefore, the missing doublets 2S, 2D, 1F, 2P, and 3S can be thought of as filled up with these states. We study the two-body strong decay widths and branching ratios of missing doublets and plot the branching ratios vs. the mass of the decaying particle. These plots are used to thoroughly analyze all assignments to D{sub J}(3000) and various possibilities for the J{sup p} values. (orig.)

  10. Heavy quarks fragmentation in charmed mesons in DELPHI experiment at LEP

    International Nuclear Information System (INIS)

    With the big statistics expected at LEP, the electroweak sector of the Standard Model can be tested as well as the theory of strong interactions. Quantum Chromo-Dynamics is indeed predictive for quarks properties, but does not explain how quarks fragment into hadrons. So far the hadronization can only be described with phenomenological models. The work presented in this thesis was performed on the DELPHI experiment at LEP and concerns the production and the fragmentation of heavy quarks into charmed mesons D , D* and D**. With the whole statistics of 1991 and 1992 (1 013 300 hadronic decays of the Z), more than 4500 charmed mesons decays have been reconstructed in the channels D0→ K- π+ , D+→ K- π+π+ and D*+→ D0π+ followed by D0→ K-π+ . Using also 1993 data and the channel D0→ K-π+π+π- , evidence for D** production is presented. For the first time, the production rate is measured for each D meson separately for cc and bb contributions. In fact, D mesons can be produced either directly from the fragmentation of c quark or un-directly from the fragmentation of b quark into B mesons which decay into D mesons. (authors). 120 refs

  11. Potential description of charmonium and charmed-strange mesons from lattice QCD

    CERN Document Server

    Kawanai, Taichi

    2015-01-01

    We present spin-independent and spin-spin interquark potentials for the charmonium and charmed-strange mesons, which are calculated in 2+1 flavor lattice QCD simulations using the PACS-CS gauge configurations generated at the lightest pion mass ($M_\\pi \\approx 156(7)$~MeV) with a lattice cutoff of $a^{-1}\\approx 2.2$ GeV and a spatial volume of $(3~{\\rm fm})^3$. For the charm quark, we use a relativistic heavy quark (RHQ) action with fine tuned RHQ parameters, which closely reproduce both the experimental spin-averaged mass and hyper-fine splitting of the $1S$ charmonium. The interquark potential and the quark kinetic mass, both of which are key ingredients within the potential description of heavy-heavy and heavy-light mesons, are determined from the equal-time Bethe-Salpeter (BS) amplitude. The charmonium potentials are obtained from the BS wave function of $1S$ charmonia ($\\eta_c$ and $J/\\psi$ mesons), while the charmed-strange potential are calculated from the $D_s$ and $D_s^{\\ast}$ heavy-light mesons. We...

  12. Observation and study of bottom-meson decays to a charm meson, a proton-antiproton pair, and pions

    Energy Technology Data Exchange (ETDEWEB)

    Hong, Tae Min [Univ. of California, Santa Barbara, CA (United States)

    2010-04-27

    Bottom-meson decays with baryons show two unusual features—the branching fractions are enhanced for multibody decays and the baryon-antibaryon subsystem recoils against the other decay products—and their reasons are not yet well understood. Moreover, measurements using explicit reconstruction techniques constitute only about 1% out of about 8% of such decays. This Dissertation reports the study of ten bottom-meson decays (labeled 0– 9) to a proton-antiproton pair, a charm meson, and a system of up to two pions, using the BABAR Experiment’s 455×106 BB pairs produced with the PEP-II asymmetric-energy e+e- collider at the Stanford Linear Accelerator Center.

  13. Charmed hadrons in nuclear medium

    CERN Document Server

    Tolos, L; Garcia-Recio, C; Molina, R; Nieves, J; Oset, E; Ramos, A

    2009-01-01

    We study the properties of charmed hadrons in dense matter within a coupled-channel approach which accounts for Pauli blocking effects and meson self-energies in a self-consistent manner. We analyze the behaviour in this dense environment of dynamically-generated baryonic resonances as well as the open-charm meson spectral functions. We discuss the implications of the in-medium properties of open-charm mesons on the $D_{s0}(2317)$ and the predicted X(3700) scalar resonances.

  14. From the ψ to charmed mesons: Three years with the SLAC-LBL detector at SPEAR

    International Nuclear Information System (INIS)

    As I look back at the first three years or so at SPEAR, I consider this one of the most revolutionary or perhaps the most revolutionary, experiment in the 60 year history of particle physics. It certainly was the most exciting time, in a laboratory that is, that I have ever experienced. In my talk I will cover the period 1973--1976 which saw the discoveries of the ψ and ψ' resonances the χ states and most of the Psion spectroscopy, the D degree, D+* charmed meson doublet as well as the D degree* and D+* doublet. I will also refer briefly to some more recent results. Most of the discoveries I will mention were made with the SLAC-LBL Magnetic Detector or ''MARK I'' which we operated at SPEAR from 1973 to 1976. In 1976 the MARK I was modified to include a ''Lead Glass Wall'' (LGW) for improved photon and electron detection. This involved a new physics group from LBL, who built the LGW, Lina Barbaro-Galtieri et al. as well as a continuing group from SLAC, Martin Perl and Gary Feldman et al. to provide continuity in the running of the MARK I and to continue the study of the anomalous eμevents which Martin found earlier and which eventually were identified as the signature of the τ lepton

  15. Molecular components in P-wave charmed-strange mesons

    CERN Document Server

    Ortega, Pablo G; Entem, David R; Fernandez, Francisco

    2016-01-01

    Results obtained by various experiments show that the $D_{s0}^{\\ast}(2317)$ and $D_{s1}(2460)$ mesons are very narrow states located below the $DK$ and $D^{\\ast}K$ thresholds, respectively. This is markedly in contrast with the expectations of naive quark models and heavy quark symmetry. Motivated by a recent lattice study which addresses the mass shifts of the $c\\bar{s}$ ground states with quantum numbers $J^{P}=0^{+}$ ($D_{s0}^{\\ast}(2317)$) and $J^{P}=1^{+}$ ($D_{s1}(2460)$) due to their coupling with $S$-wave $D^{(\\ast)}K$ thresholds, we perform a similar analysis within a nonrelativistic constituent quark model in which quark-antiquark and meson-meson degrees of freedom are incorporated. The quark model has been applied to a wide range of hadronic observables and thus the model parameters are completely constrained. The coupling between quark-antiquark and meson-meson Fock components is done using a modified version of the $^{3}P_{0}$ decay model. We observe that the coupling of the $0^{+}$ $(1^{+})$ mes...

  16. Charmed Meson Production in Deep Inelastic e + A Scattering at Small-x

    Institute of Scientific and Technical Information of China (English)

    王宏民; 侯召宇; 刘家福; 孙献静

    2011-01-01

    Based on the nuclear effects considered in the Glauber-Gribov approach, charmed meson production in high energy deep inelastic e + A scattering is investigated in the color dipole formalism. Using the Peterson fragmentation function and the KLR-AdS/CFT color dipole model, which reasonably well describes the HERA data for the inclusive structure functions at small Bjorken-x, we present the predictive results for the D-meson transverse spectra at EIC and LHeC energies. The theoretical results indicate that the x-independence phenomena at very small-x predicted by the KLR-AdS/CFT model are not seen in our calculation.

  17. Charmed decays of the B-meson in the quark model

    Energy Technology Data Exchange (ETDEWEB)

    Grach, I.M. [Inst. for Theor. Phys., Moscow (Russian Federation); Narodetskii, I.L. [Inst. for Theor. Phys., Moscow (Russian Federation); Ter-Martirosyan, K.A. [Inst. for Theor. Phys., Moscow (Russian Federation); Simula, S. [Istituto Nazionale di Fisica Nucleare, Roma (Italy)

    1997-04-01

    Exclusive and inclusive, semileptonic and non-leptonic, charmed decays of the B-meson are investigated in the context of a phenomenological quark model. Bound-state effects are taken care of by adopting a single (model-dependent) non-perturbative wave function, describing the motion of the light spectator quark in the B-meson. A nice reproduction of both exclusive and inclusive semileptonic data is obtained. Our predictions for the electron spectrum are presented and compared with those of the Isgur-Scora-Grinstein-Wise quark model. Finally, our approach is applied to the calculation of inclusive non-leptonic widths, obtaining a remarkable agreement with experimental findings. (orig.).

  18. Charmed decays of the B-meson in the quark model

    International Nuclear Information System (INIS)

    Exclusive and inclusive, semileptonic and non-leptonic, charmed decays of the B-meson are investigated in the context of a phenomenological quark model. Bound-state effects are taken care of by adopting a single (model-dependent) non-perturbative wave function, describing the motion of the light spectator quark in the B-meson. A nice reproduction of both exclusive and inclusive semileptonic data is obtained. Our predictions for the electron spectrum are presented and compared with those of the Isgur-Scora-Grinstein-Wise quark model. Finally, our approach is applied to the calculation of inclusive non-leptonic widths, obtaining a remarkable agreement with experimental findings. (orig.)

  19. Charmed decays of the B-meson in the quark model

    OpenAIRE

    Grach, I. L.; I. M. Narodetskii(ITEP, Moscow); Ter-Martirosyan, K. A.; Simula, S.

    1996-01-01

    Exclusive and inclusive, semileptonic and non-leptonic, charmed decays of the B-meson are investigated in the context of a phenomenological quark model. Bound-state effects are taken care of by adopting a single (model-dependent) non-perturbative wave function, describing the motion of the light spectator quark in the B-meson. A nice reproduction of both exclusive and inclusive semileptonic data is obtained. Our predictions for the electron spectrum are presented and compared with those of th...

  20. Phenomenology of a pseudoscalar glueball and charmed mesons in the extended linear sigma model

    International Nuclear Information System (INIS)

    In the framework of the so-called extended linear sigma model (eLSM), we include a pseudoscalar glueball with a mass of 2.6 GeV (as predicted by Lattice QCD simulations) and we compute the two- and three-body decays into scalar and pseudoscalar mesons. This study is relevant for the future PANDA experiment at the FAIR facility. As a second step, we extend the eLSM by including the charm quark according to the global U(4)r x U(4)l chiral symmetry. We compute the masses, weak decay constants and strong decay widths of open and hidden charmed mesons. The results are in good agreement with the experimental data.

  1. Measurement of the semileptonic decay of charmed mesons at the electron-positron storage ring DORIS

    International Nuclear Information System (INIS)

    The semileptonic decay of charmed mesons produced in e+e- reactions above 4 GeV c.m. energy was studied using the DASP detector. By the selection of events with one electron and at least two addtional charged particles (>= 1 hadron) the semileptonic decays of charmed mesons could extensively be separated from decays of the heavy lepton tau. The momentum spectrum of the electrons excludes large contributions of the purely leptonic decay D → e anti v and the Cabibbo suppressed decay D → e anti vπ, but is compatible with the decays D → e anti v K and D → e anti v Ksup(*)(892) e.g. a mixing of both. The semileptonic branching ratio of neutral and charged D mesons is by a comparison of the inclusive electron cross section to the total hadronic contributing to the production of charmed hadrons determined to Bsub(e) = (8.5 +- 2.2)%. For the mean semileptonic branching ratio of all charmed hadrons contributing to the cross section in the c.m. energy range from 3.9 GeV to 5.2 GeV Bsub(e) = (7.5 +- 2.0)% is obtained. The determination of the semileptonic branching ratio from the part of electron-hadron events with two electrons in the final state yields Bsub(e) = (13 +- 5)%. The semileptonic decay is therefore suppressed relatively to the nonleptonic decay of charmed hadrons, but the semileptonic branching ratio is larger than it is expected from an analogy to the decay of strange particles. (orig.)

  2. Total cross sections of beauty and charmed mesons on protons

    International Nuclear Information System (INIS)

    Using a simple scaling law we predict the values of the total cross sections σ(B±p), σBd,s0, σ(bar Bd,s0P), σ(Dd,s±P), σ(D0p), σ(bar D0p) from known total Kp cross sections. We assume that mesons with the same light valence quark, q, and differing only by their heavy valence quark content, Q, have total cross sections on protons which scale as the inverse of the nth power of the reduced mass of the meson. We predict that σ(Q bar q)p > σ(bar Qq)p

  3. Neutrino-production of a charmed meson and the transverse spin structure of the nucleon

    OpenAIRE

    Pire, B.; Szymanowski, L.

    2015-01-01

    International audience We calculate the amplitude for exclusive neutrino production of a charmed meson on an unpolarized target, in the colinear QCD approach where generalized parton distributions (GPDs) factorize from perturbatively calculable coefficient functions. We demonstrate that the transversity chiral odd GPDs contribute to the transverse cross section if the hard amplitude is calculated up to order mc/Q. We show how to access these GPDs through the azimuthal dependence of the νN ...

  4. Formation spectra of charmed meson--nucleus systems using an antiproton beam

    CERN Document Server

    Yamagata-Sekihara, J; Nieves, J; Salcedo, L L; Tolos, L

    2015-01-01

    We investigate the structure and formation of charmed meson--nucleus systems, with the aim of understanding the charmed meson--nucleon interactions and the properties of the charmed mesons in the nuclear medium. The $\\bar{D}$ mesic nuclei are of special interest, since they have tiny decay widths due to the absence of strong decays for the $\\bar{D} N$ pair. Employing an effective model for the $\\bar{D} N$ and $D N$ interactions and solving the Klein--Gordon equation for $\\bar{D}$ and $D$ in finite nuclei, we find that the $D^{-}$-${}^{11}\\rm{B}$ system has $1 s$ and $2p$ mesic nuclear states and that the $D^{0}$-${}^{11}\\rm{B}$ system binds in a $1s$ state. In view of the forthcoming experiments by the PANDA and CBM Collaborations at the future FAIR facility and the J-PARC upgrade, we calculate the formation spectra of the $[D^{-}$-${}^{11}\\rm{B}]$ and $[D^{0}$-${}^{11}\\rm{B}]$ mesic nuclei for an antiproton beam on a ${}^{12} \\rm{C}$ target. Our results suggest that it is possible to observe the $2 p$ $D^{-}...

  5. Vector meson-vector meson interaction and dynamically generated resonances

    International Nuclear Information System (INIS)

    We report upon 11 composite meson states, dynamically generated from the vector meson–vector meson interaction using the local hidden gauge formalism within a unitary approach. Six of these states are associated to the f0(1370), f0(1710), f2(1270), f'2(1525), a2(1320) and K*2(1430) resonances. At the same time we predict five other states with the quantum numbers of h1, a0, b1, K*0, and K1 which could be tested by future experiments.

  6. Pseudotensor mesons as three-body resonances

    CERN Document Server

    Roca, L

    2011-01-01

    We show that the lightest pseudotensor mesons J^{PC}=2^-+ can be regarded as molecules made of a pseudoscalar (P) 0^-+ and a tensor 2^++ meson, where the latter is itself made of two vector (V) mesons. The idea stems from the fact that the vector-vector interaction in s-wave and spin 2 is very strong, to the point of generating the 2^++ tensor mesons. On the other hand the interaction of a pseudoscalar with a vector meson in s-wave is also very strong and it generates dynamically the lightest axial-vector mesons. Therefore we expect the PVV interaction to be strongly attractive and thus able to build up quasibound PVV resonances. We calculate the three body PVV interaction by using the fixed center approximation to the Faddeev equations where the two vectors are clustered forming a tensor meson. We find clear resonant structures which can be identified with the pi_2(1670), eta_2(1645) and K^*_2(1770) (2^-+) pseudotensor mesons.

  7. Decay constants of the charmed tensor mesons at finite temperature

    Science.gov (United States)

    Azizi, K.; Sundu, H.; Türkan, A.; Veliev, E. Veli

    2016-01-01

    Investigation of the thermal properties of the mesons with higher spin is one of the important problems in the hadron physics. At finite temperature, the Lorentz invariance is broken by the choice of a preferred frame of reference and some new operators appear in the Wilson expansion. Taking into account these additional operators, we calculate the thermal two-point correlation function for D2*(2460 ) and Ds2 *(2573 ) tensor mesons. In order to perform the numerical analysis, we use the fermionic part of the energy density obtained both from lattice QCD and Chiral perturbation theory. We also use the temperature dependent continuum threshold and show that the values of the decay constants decrease considerably near to the critical temperature compared to their values in the vacuum. Our results at zero temperature are in good consistency with predictions of other nonperturbative models.

  8. Nonleptonic decays of charmed mesons under the W-exchange dominance hypothesis

    International Nuclear Information System (INIS)

    Two- and three-body decays of charmed mesons are studied under the ''W-exchange'' dominance hypothesis. As for the two-body decays, the branching ratios for them are calculated in the scalar meson pole approximation. It is seen through a phenomenological analysis that the contribution of the annihilation diagram is much smaller than that of the W-exchange as has been expected in terms of 1/N expansion. This predicts that the F+ → π+eta decay is considerably suppressed although it is a Cabibbo favored decay. It is also seen that the new Cabibbo angle theta sub(c)' which is defined in the charm changing currents is nearly equal to the old one theta sub(c). The soft meson technique combined with a linear approximation is applied to the three-body decays. The calculated value of B(D+ → π+π+K-) reproduced considerably well the experimental value, but this method is not successful in the other three-body decays of D mesons. The branching ratios for these decays calculated by assuming that quasi two-body decays contribute dominantly to these decays are almost consistent with the known data. (author)

  9. Charm physics: theoretical review

    OpenAIRE

    Petrov, Alexey A.

    2003-01-01

    We review recent developments in charm physics, focusing on the physics of charmed mesons. We discuss charm spectroscopy, decay constants, as well as searches for new physics with charmed mesons. We discuss D0-anti-D0 mixing and CP-violation in charm decays. We also present the modified Nelson plot of charm mixing predictions.

  10. Analysis of Two-body Charmed $B$ Meson Decays in Factorization-Assisted Topological-Amplitude Approach

    OpenAIRE

    Zhou, Si-Hong; Wei, Yan-Bing; Qin, Qin; Li, Ying; Yu, Fu-Sheng; Lu, Cai-Dian

    2015-01-01

    Within the factorization-assisted topological-amplitude approach, we study the two-body charmed $B$ meson decays $B_{u,d,s} \\to D^{(*)}M$, with $M$ denoting a light pseudoscalar (or vector) meson. The meson decay constants and transition form factors are factorized out from the hadronic matrix element of topological diagrams. Therefore the effect of SU(3) symmetry breaking is retained, which is different from the conventional topological diagram approach. The number of free nonperturbative pa...

  11. Analysis of the charmed mesons $D_{1}^{*}(2680)$, $D_{3}^{*}(2760)$ and $D_{2}^{*}(3000)$

    CERN Document Server

    Yu, Guo Liang; Li, Zhen Yu

    2016-01-01

    In this work, we systematically study the strong decay behaviors of the charmed mesons $D_{1}^{*}(2680)$, $D_{3}^{*}(2760)$ and $D_{2}^{*}(3000)$ reported by the LHCb collaboration. By comparing the masses and the decay properties with the results of the experiment, we assigned these newly observed mesons as the $2S\\frac{1}{2}1^{-}$, $1D\\frac{5}{2}3^{-}$ and $1F\\frac{5}{2}2^{+}$ states respectively. As a byproduct, we also study the strong decays of the unobserved $2P\\frac{3}{2}2^{+}$ and $2F\\frac{5}{2}2^{+}$ charmed mesons, which is helpful to the future experiments in searching for these charmed mesons.

  12. Charmed-meson fragmentation functions with finite-mass corrections

    International Nuclear Information System (INIS)

    We elaborate the inclusive production of single heavy-flavored hadrons in e+e- annihilation at next-to-leading order in the general-mass variable-flavor-number scheme. In this framework, we determine non-perturbative fragmentation functions for D0, D+, and D*+ mesons by fitting experimental data from the Belle, CLEO, ALEPH, and OPAL Collaborations, taking dominant electroweak corrections due to photonic initial-state radiation into account. We assess the significance of finite-mass effects through comparisons with a similar analysis in the zero-mass variable-flavor-number scheme. (orig.)

  13. Search for charm production in direct decays of the Υ(1S) resonance

    International Nuclear Information System (INIS)

    The production of D*(2010)+ and J/ψ mesons and prompt leptons has been investigated in e+e- interactions at the Υ(1S) resonance energy. The data were collected at the storage ring DORIS II at DESY with the ARGUS detector. We obtain upper limits of BRdir (Υ(1S)→D*(2010)±+X) p > 0.2) and BRdir (Υ(1S)→J/ψ+X) -3, both at the 90% confidence level. From the prompt lepton analysis, a model dependent limit of BRdir (Υ(1S)→Yc+X) c denoting a charm-containing particle) is derived. (orig.)

  14. Search for charm production in direct decays of the Υ(1S) resonance

    International Nuclear Information System (INIS)

    The production of D*(2010)+ and J/ψ mesons and of prompt leptons has been investigated in e+e- interactions at the Υ(1S) resonance energy. The data were collected at the storage ring DORIS II at DESY with the ARGUS detector. We obtain upper limits of BRdir(Υ(1S)→D*(2010)±+X)p>0.2) and BRdir(Υ(1S)→J/ψ+X)-3, both at the 90% confidence level. From the prompt lepton analysis, a model dependent limit of BRdir(Υ(1S)→Yc+X)c denoting a charm-containing particle) is derived. (orig.)

  15. Measurement of gluon polarization through spin asymmetry in the production of charmed mesons

    International Nuclear Information System (INIS)

    The main aim of the COMPASS experiment is the measurement of the gluon polarization in the nucleon, which can be accessed by the spin asymmetry in the scattering of a polarized muon beam on a polarized nucleon target. The process sensitive to the gluon polarization is the photon-gluon fusion, which can be tagged in the cleanest way by looking at the production of D0 mesons. At COMPASS, D0 mesons are reconstructed from the invariant mass of their decay products. However, it is a rare process, dominated by a large combinatorial background. This thesis presents some studies devoted to the improvement of the charmed mesons reconstruction. The measurement of the efficiency and the space resolution of the 3 drift chamber stations of the COMPASS spectrometer is a necessary step in understanding the performances of the reconstruction of particle trajectories. The hadron identification, which is fundamental in the reconstruction of charmed meson decay, is performed by a RICH detector. A statistical treatment of signal and background, together with an upgrade project to replace the present front-end electronics, have been developed in order to improve the particle identification performances. The second part of this work concerns the spin asymmetry measurement, which requires the application of event selection criteria in order to minimize the noise over signal ratio in the D0 invariant mass, and the development of event-weighting methods to reduce the statistical error. This work presents a preliminary result, based on 2002-2004 statistics, which is the ΔG/G measurement from open charm production. Although the error bars are large, the measured gluon polarization is compatible with zero. Given the present accuracy, this result is compatible with the existing direct measurements from other channels. However, it does not allow to distinguish between different theoretical models. (author)

  16. A-dependence for the charmed meson production; Dependencia em A para a producao de mesons charmosos

    Energy Technology Data Exchange (ETDEWEB)

    Alves, Gilvan Augusto

    1992-03-01

    A report is presented of a recent direct measurement of the nucleon number ({lambda}) dependence of the production cross sections for the charmed mesons D{sup 0} and D{sup +} using {pi}{sup +-} beams incident on a segmented target of Be, Al, Cu and W. The data derive from the experiment E769 - Hadroproduction of Charm - at Fermilab. The experimental apparatus is described together with the following analysis. Starting from a sample of {approx} 1500 D mesons in the range of O < X{sub F} < 1, the data are found to be well described by the parameterization {sigma}{sub A} = {sigma}{sub O} A{sup {alpha}}, with {alpha} = 0.99 {+-} 0.03. The X{sub F} dependence of {alpha} is examined and the results obtained are compared with those of other experiments and with theoretical expectations based on perturbative QCD and on an EMC like model of nuclear shadowing. (author). 85 refs, 61 figs, 22 tabs.

  17. Production of charged ρ meson in bottom hadron charmed decays and the effect of the finite width correction of the ρ meson

    International Nuclear Information System (INIS)

    We calculate the branching ratio of a bottom hadron decaying into a charmed hadron and a charged ρ meson within the QCD factorization approach. We consider the effect of the finite width correction of the ρ meson. Our numerical calculation shows an obvious correction because of this effect. We find that the finite width effect of the ρ meson reduces the branching ratios by about 9 % to 11 % for bottom meson decay channels: B+ → D0ρ+, B0 → D-ρ+, and B0s → D-sρ+, and increases the branching ratio by about 10 % for Λb0 → Λc+ρ-. (orig.)

  18. Study of 1D Strange Charmed Meson Family Using HQET

    Directory of Open Access Journals (Sweden)

    Pallavi Gupta

    2016-01-01

    Full Text Available Recently LHCb predicted spin 1 and spin 3 states Ds1⁎(2860 and Ds3⁎(2860 which are studied through their strong decays and are assigned to fit the 13D1 and 13D3 states in the charm spectroscopy. In this paper, using the heavy quark effective theory, we state that assigning Ds1⁎(2860 as the mixing of 13D1-23S1 states is rather a better justification to its observed experimental values than a pure state. We study its decay modes variation with hadronic coupling constant gxh and the mixing angle θ. We appoint spin 3 state Ds3⁎(2860 as the missing 1D  3-JP state and also study its decay channel behavior with coupling constant gyh. To appreciate the above results, we check the variation of decay modes for their spin partners states, that is, 1D2 and 1D2′, with their masses and strong coupling constant, that is, gxh and gyh. Our calculation using HQET approach gives mixing angle of the 13D1-23S1 state for Ds1⁎(2860 to lie in the range (-1.6 radians ≤θ≤-1.2 radians. Our calculation for coupling constant values gives gxh to lie within value range of 0.17–0.20 and gyh to be 0.40. We expect from experiments to observe this mixing angle to verify our results.

  19. NLO QCD result for the gluon polarization from open charm $D^{0}$ meson production at COMPASS

    CERN Document Server

    Kurek, Krzysztof

    2011-01-01

    One of the main goals of the COMPASS experiment is the measurement of the gluon contribution to the nucleon spin. Among the processes studied by COMPASS, open- charm $D^{0}$ meson production seems to be the cleanest channel for probing gluons in the energy range covered by the experiment. The gluon polarisation is related to the measured asymmetry for charmed mesons production via the analyzing power (asymmetry at the partonic level) calculated in the perturbative QCD frame. The analyzing power for the "photon-gluon fusion" process corresponds to a LO QCD approximation. The signicant improvement of the statistical precision and the new, nal LO result are presented . The NLO QCD corrections to the partonic cross sections (unpolarised and polarized ones) are now also included into the analysis scheme since these higher order contributions are not negligible. The preliminary NLO QCD result on the gluon polarisation based on a set of measured $D^{0}$ meson asymmetries in kinematical bins of the $D^{0}$ energy amd...

  20. Results on charmed baryons and mesons from the SLAC-LBL Mark II detector at SPEAR

    International Nuclear Information System (INIS)

    Results from the SLAC-LBL Mark II detector at SPEAR are presented. A few of the very recent results are emphasized, namely: (1) The observation of charmed baryons; a signal Λ/sub c/ → pK-π+ and the charge conjugate of that channel, anti Λ/sub c/ → anti pK+π- are now established. Some evidence also exists for other channels, K/sub S/p, Λπ+, etc. (2) The study of charmed mesons. Here some new hadronic decay modes are mentioned, and the Cabibbo-suppressed decay modes. (3) The D+ - D0 lifetime ratio; evidence is presented that the D+ has a longer lifetime than the D0 by about a factor of three, although the statistical error is fairly large on this number

  1. Insight from elliptic flow of open charm mesons using quark coalescence model at RHIC and LHC energies

    CERN Document Server

    Esha, Roli; Huang, Huan Zhong

    2016-01-01

    A study of elliptic flow of open charm mesons, $D^0$ and $D_S ^\\pm$ using quark coalescence as a mechanism of hadronization within the framework of a multi-phase transport model has been presented. We have studied the transverse momentum dependence of the elliptic flow parameter at mid-rapidity ($|y|$ $<$ 1.0) for minimum bias Au+Au collisions at $\\sqrt{s_{NN}} = 200$ GeV (RHIC) and Pb+Pb collisions $\\sqrt{s_{NN}} = 2.76$ TeV (LHC) for different values of partonic interaction cross-section and QCD coupling constant. We have compared our calculations with the experimentally measured data at the LHC energy. We have also studied the effect of specific viscosity on elliptic flow of open charm mesons within the transport model approach. Our study indicates that the elliptic flow of open charmed mesons is more sensitive to viscous properties of QGP medium compared to light hadrons.

  2. New mechanisms for double charmed meson production at the LHCb

    CERN Document Server

    Maciula, Rafal; Shipilova, Alexandra V; Szczurek, Antoni

    2016-01-01

    We discuss production of $D^0 D^0$ (and ${\\bar D}^0 {\\bar D}^0$) pairs related to the LHCb Collaboration results for $\\sqrt{s}$ = 7 TeV in proton-proton scattering. We consider double-parton scattering (DPS) mechanisms of double $c \\bar c$ production and subsequent $cc \\to D^{0}D^{0}$ hadronization as well as double $g$ and mixed $g c\\bar c $ production with $gg \\to D^{0}D^{0}$ and $gc \\to D^{0}D^{0}$ hadronization calculated with the help of the scale-dependent hadronization functions of Kniehl et al. Single-parton scattering (SPS) mechanism of digluon production is also taken into account. We compare our results with several correlation observables in azimuthal angle $\\varphi_{D^{0}D^{0}}$ between $D^{0}$ mesons or in dimeson invariant mass $M_{D^{0}D^{0}}$. The inclusion of new mechanisms with $g \\to D^{0}$ fragmentation leads to larger cross sections, than when including only DPS mechanism with standard scale-independent $cc \\to D^{0}D^{0}$ fragmentation functions. Some consequences of the presence of the...

  3. New mechanisms for double charmed meson production at the LHCb

    Science.gov (United States)

    Maciuła, Rafał; Saleev, Vladimir A.; Shipilova, Alexandra V.; Szczurek, Antoni

    2016-07-01

    We discuss production of D0D0 (and Dbar0Dbar0) pairs related to the LHCb Collaboration results for √{ s} = 7 TeV in proton-proton scattering. We consider double-parton scattering (DPS) mechanisms of double c c bar production and subsequent cc →D0D0 hadronization as well as double g and mixed gc c bar production with gg →D0D0 and gc →D0D0 hadronization calculated with the help of the scale-dependent hadronization functions of Kniehl et al. Single-parton scattering (SPS) mechanism of digluon production is also taken into account. We compare our results with several correlation observables in azimuthal angle φD0D0 between D0 mesons or in dimeson invariant mass MD0D0. The inclusion of new mechanisms with g →D0 fragmentation leads to larger cross sections, than when including only DPS mechanism cc →D0D0 with standard scale-independent fragmentation functions. Some consequences of the presence of the new mechanisms are discussed. In particular a larger σeff is needed to describe the LHCb data. There is a signature that σeff may depend on transverse momentum of c quarks and/or c bar antiquarks.

  4. Study of charm quark fragmentation into D* mesons with the H1 detector at HERA II

    International Nuclear Information System (INIS)

    In this work charm quark fragmentation into D* mesons is investigated in deep-inelastic electron proton collisions. This work is based on data collected in the years 2004 - 2007 by the H1 detector at HERA, corresponding to a total integrated luminosity of 354.1 pb-1. Three observables denoted zjet,zhem and zhem(jet) are measured, each of them meant to approximate the momentum fraction of the charm quark transferred to the D* meson. In case of zjet the quark momentum is estimated as the momentum of the D* jet, for the two other observables it is approximated by the momentum of an appropriately chosen D* hemisphere. The visible range is defined by the phase space requirements on the DIS events: Q2 > 5 GeV2, 0.05 *± particles: 1.5 GeV T(D*) *) vertical stroke T(D*jet) > 3.0 GeV enters the phase space definition in case of zjet and zhem(jet), where a reconstructed jet containing the D* meson is required. Within this phase space the normalized single differential cross sections are measured in bins of the three observables. Two Monte Carlo models, RAPGAP and CASCADE, both interfaced with the PYTHIA program for the Lund string fragmentation, are used to make predictions of the respective cross sections for different parametrizations (Peterson and Kartvelishvili) of the charm fragmentation function. The difference in cross sections between data and Monte Carlo model predictions for different values of the fragmentation parameter is quantified by calculating values of χ2 in order to extract optimal parameters for the Peterson and Kartvelishvili parametrization. Using predictions from PYTHIA for e+e- annihilation optimal parameters are extracted also from the published BELLE and ALEPH data. The obtained results show that the H1 data allow the determination of the fragmentation parameters with a precision which is of interest. The extracted parameters are however found to apparently depend on the charm quark production energy: the zhem-based results are not consistent with

  5. Effect of residual Bose-Einstein correlations on the Dalitz plot of hadronic charm meson decay

    CERN Document Server

    Cuautle, E

    1998-01-01

    We show that the presence of residual Bose-Einstein correlations may affect the resonant contribution of hadronic charm decays where two identical pions appear in the final state. The distortion of the phase space of the reaction would be visible in the dalitz plot. The decay D+ --> K- pi+ pi+ is discussed but results can be generalized to any decay with identical bosons.

  6. Charm quark mass and D-meson decay constants from two-flavour lattice QCD

    International Nuclear Information System (INIS)

    We present a computation of the charm quark's mass and the leptonic D-meson decay constants fD and fDs in two-flavour lattice QCD with non-perturbatively O(a) improvedWilson quarks. Our analysis is based on the CLS configurations at two lattice spacings (a=0.065 and 0.048 fm, where the lattice scale is set by fK) and pion masses ranging down to ∝190 MeV at Lmπ>or similar 4, in order to perform controlled continuum and chiral extrapolations with small systematic uncertainties.

  7. The Effects of Charged Charm Mesons on the Line Shapes of the X(3872)

    OpenAIRE

    Braaten, Eric; Lu, Meng

    2007-01-01

    The quantum numbers J^PC = 1++ of the X(3872) and the proximity of its mass to the D*0 anti-D0 threshold imply that it is either a loosely-bound hadronic molecule whose constituents are a superposition of D*0 anti-D0 and D0 anti-D*0 or it is a virtual state of charm mesons. The line shapes of the X(3872) can discriminate between these two possibilities. At energies within a few MeV of the D*0 anti-D0 threshold, the lines shapes of the X produced in B -> K transitions are determined by its bin...

  8. Even- and Odd-Parity Charmed Meson Masses in Heavy Hadron Chiral Perturbation Theory

    Energy Technology Data Exchange (ETDEWEB)

    Thomas Mehen; Roxanne Springer

    2005-03-01

    We derive mass formulae for the ground state, J{sup P} = 0{sup -} and 1{sup -}, and first excited even-parity, J{sup P} = 0{sup +} and 1{sup +}, charmed mesons including one loop chiral corrections and {Omicron}(1/m{sub c}) counterterms in heavy hadron chiral perturbation theory. We show a variety of fits to the current data. We find that certain parameter relations in the parity doubling model are not renormalized at one loop, providing a natural explanation for the equality of the hyperfine splittings of ground state and excited doublets.

  9. Two-body Charmed $B$ Meson Decays In Factorization Assisted Topological Amplitude Approach

    CERN Document Server

    Lu, Cai-Dian

    2016-01-01

    We analyze the two-body charmed $B$ meson decays $B_{u,d,s} \\to D^{(*)}P(V)$ in the factorization assisted topological amplitude approach, where $P(V)$ denoting a light pseudoscalar (vector) meson. Different from the conventional topological diagram approach, flavor $SU(3)$ symmetry breaking effects are taken into account. Therefore only four universal nonperturbative parameters are introduced to describe the contribution from non-factorization diagrams for all the decay channels. The number of free parameters and the $\\chi^2$ per degree of freedom are both significantly reduced comparing with the conventional topological diagram approach. With the 4 fitted parameters, we predict the branching fractions of 120 decay modes induced by both $b\\to c$ and $b\\to u$ transitions, which are well consistent with the measured data or to be tested on the future experiments. We also investigated the relative size of different topological diagrams, isospin violation, flavor $SU(3)$ symmetry breaking effects, compared with ...

  10. Study of semileptonic decays of B mesons to charmed baryons

    International Nuclear Information System (INIS)

    Using data collected by the CLEO II detector at a center-of-mass energy on or near the Υ(4S) resonance, we have determined the 90% confidence level upper limit B(bar B→Λc+e-X)/B(bar B→(Λc+ or bar Λc-)X)-→Λc+bar pe-bar νe)/B(bar B→Λc+bar pX)c+bar pX)/B(bar B→(Λc+ or bar Λc-)X)=0.57±0.05±0.05. copyright 1998 The American Physical Society

  11. Non-leptonic decays of charmed mesons into two Pseudoscalars

    CERN Document Server

    Biswas, Aritra; Abbas, Gauhar

    2015-01-01

    We examine the role of resonant coupled channel final state interactions (FSI), as well as weak annihilation and exchange contributions in explaining all the two body hadronic $D\\rightarrow PP$ decay modes data. In the un-unitarized amplitudes we include modified Wilson coefficients with non-factorizable corrections as parameters. For the hadronic form factors the z-series expansion method is used to get the $q^2$ dependence. The FSI effects are incorporated via a phenomenological approach with widths of resonances to various channels taken from observations where available, and others as additional parameters to be determined from fits of all the theoretical rates to the measured ones. Our results for the rather hard to explain $D^0\\rightarrow K^+K^-, \\pi^+\\pi^- $ are in agreement with measured values. We demonstrate that both weak exchange as well as FSI effects are required to get the correct branching ratio for the $D^0\\rightarrow K^0\\bar{K^0}$ mode. Using our unitarized amplitudes we evaluate the strong ...

  12. Charm Meson Spectra in e^+e^- Annihilation at 10.5 GeV c.m.e

    OpenAIRE

    Artuso, M.

    2004-01-01

    Using the CLEO detector at the Cornell Electron-positron Storage Ring, we have measured the scaled momentum spectra, dsigma/dx_p, and the inclusive production cross sections of the charm mesons D+, D0, D*+, and D*0 in e+e- annihilation at about 10.5 GeV center of mass energy, excluding the decay products of B mesons. The statistical accuracy and momentum resolution are superior to previous measurements at this energy.

  13. D{sub s1}{sup ∗}(2860) and D{sub s3}{sup ∗}(2860): candidates for 1D charmed-strange mesons

    Energy Technology Data Exchange (ETDEWEB)

    Song, Qin-Tao [Nuclear Theory Group, Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou (China); Research Center for Hadron and CSR Physics, Lanzhou University & Institute of Modern Physics of CAS, 730000, Lanzhou (China); University of Chinese Academy of Sciences, 100049, Beijing (China); Chen, Dian-Yong, E-mail: chendy@impcas.ac.cn [Nuclear Theory Group, Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou (China); Research Center for Hadron and CSR Physics, Lanzhou University & Institute of Modern Physics of CAS, 730000, Lanzhou (China); Liu, Xiang, E-mail: xiangliu@lzu.edu.cn [Research Center for Hadron and CSR Physics, Lanzhou University & Institute of Modern Physics of CAS, 730000, Lanzhou (China); School of Physical Science and Technology, Lanzhou University, 730000, Lanzhou (China); Matsuki, Takayuki, E-mail: matsuki@tokyo-kasei.ac.jp [Tokyo Kasei University, 1-18-1 Kaga, Itabashi, 173-8602, Tokyo (Japan); Theoretical Research Division, Nishina Center, RIKEN, 351-0198, Saitama (Japan)

    2015-01-27

    Newly observed two charmed-strange resonances, D{sub s1}{sup ∗}(2860) and D{sub s3}{sup ∗}(2860), are investigated by calculating their Okubo–Zweig–Iizuka-allowed strong decays, which shows that they are suitable candidates for the 1{sup 3}D{sub 1} and 1{sup 3}D{sub 3} states in the charmed-strange meson family. Our study also predicts other main decay modes of D{sub s1}{sup ∗}(2860) and D{sub s3}{sup ∗}(2860), which can be accessible at the future experiment. In addition, the decay behaviors of the spin partners of D{sub s1}{sup ∗}(2860) and D{sub s3}{sup ∗}(2860), i.e., 1D(2{sup -}) and 1D{sup ′}(2{sup -}), are predicted in this work, which are still missing at present. The experimental search for the missing 1D(2{sup -}) and 1D{sup ′}(2{sup -}) charmed-strange mesons is an intriguing and challenging task for further experiments.

  14. D{sub s1}{sup *}(2860) and D{sub s3}{sup *}(2860): candidates for 1D charmed-strange mesons

    Energy Technology Data Exchange (ETDEWEB)

    Song, Qin-Tao [Chinese Academy of Sciences, Nuclear Theory Group, Institute of Modern Physics, Lanzhou (China); Lanzhou University and Institute of Modern Physics of CAS, Research Center for Hadron and CSR Physics, Lanzhou (China); University of Chinese Academy of Sciences, Beijing (China); Chen, Dian-Yong [Chinese Academy of Sciences, Nuclear Theory Group, Institute of Modern Physics, Lanzhou (China); Lanzhou University and Institute of Modern Physics of CAS, Research Center for Hadron and CSR Physics, Lanzhou (China); Liu, Xiang [Lanzhou University and Institute of Modern Physics of CAS, Research Center for Hadron and CSR Physics, Lanzhou (China); Lanzhou University, School of Physical Science and Technology, Lanzhou (China); Matsuki, Takayuki [Tokyo Kasei University, Tokyo (Japan); RIKEN, Theoretical Research Division, Nishina Center, Saitama (Japan)

    2015-01-01

    Newly observed two charmed-strange resonances, D{sub s1}{sup *}(2860) and D{sub s3}{sup *}(2860), are investigated by calculating their Okubo-Zweig-Iizuka-allowed strong decays, which shows that they are suitable candidates for the 1{sup 3}D{sub 1} and 1{sup 3}D{sub 3} states in the charmed-strange meson family. Our study also predicts other main decay modes of D{sub s1}{sup *}(2860) and D{sub s3}{sup *}(2860), which can be accessible at the future experiment. In addition, the decay behaviors of the spin partners of D{sub s1}{sup *}(2860) and D{sub s3}{sup *}(2860), i.e., 1D(2{sup -}) and 1D'(2{sup -}), are predicted in this work, which are still missing at present. The experimental search for the missing 1D(2{sup -}) and 1D'(2{sup -}) charmed-strange mesons is an intriguing and challenging task for further experiments. (orig.)

  15. Coupled-channel study of baryon resonances with charm

    CERN Document Server

    Hofmann, J; Hofmann, Julian; Lutz, Matthias F.M.

    2005-01-01

    Identifying a zero-range exchange of vector mesons as the driving force for the s-wave scattering of pseudo-scalar mesons off the baryon ground states, a rich spectrum of molecules is formed. We argue that chiral symmetry and large-$N_c$ considerations determine that part of the interaction which generates the spectrum. A bound state with exotic quantum numbers is predicted at mass 2.78 GeV. It couples strongly to the $(\\bar D_s N),(\\bar D \\Lambda ),(\\bar D \\Sigma)$ channels. A further charm minus-one system is predicted at mass 2.84 GeV as a result of $(\\bar D_s \\Lambda), (\\bar D \\Xi)$ interactions. The two so far observed s-wave baryons with charm one are recovered. We argue that the $\\Lambda_c(2880)$ is not a s-wave state. In addition to those states we predict the existence of about ten narrow s-wave baryon states with masses below 3 GeV. A triplet of crypto-exotic states decaying dominantly into channels with an $\\eta'$ is obtained with masses 4.24 GeV and 4.44 GeV.

  16. New single- and double-parton scattering mechanisms for double charmed meson production

    CERN Document Server

    Szczurek, Antoni; Saleev, Vladimir A; Shipilova, Alexandra V

    2016-01-01

    We discuss charm meson-meson pair production recently observed by the LHCb Collaboration at $\\sqrt{s}$ = 7 TeV in proton-proton scattering. We examine double-parton scattering (DPS) mechanisms of double $c \\bar c$ production and following $cc \\to D^{0}D^{0}$ hadronization as well as double $g$ and mixed $g c\\bar c $ production with $gg \\to D^{0}D^{0}$ and $gc \\to D^{0}D^{0}$ hadronization calculated with the help of the scale-dependent KKKS08 fragmentation functions. A new single-parton scattering (SPS) mechanism of $gg$ production is also taken into consideration. Calculated differential distributions as a function of transverse momentum $p_{T}$ of one of the $D^{0}$ mesons, pair invariant mass $M_{D^{0}D^{0}}$ and azimuthal angle $\\varphi_{D^{0}D^{0}}$ distributions are confronted with the measured ones. The manifestation of the new SPS mechanisms with $g \\to D^{0}$ fragmentation within the scale-dependent fragmentation scheme change the overall picture suitable for standard scale-independent fragmentation ...

  17. CP violation in charm meson decays - A signal of new physics?

    International Nuclear Information System (INIS)

    Recent measurements of the observable Delta ACP deviate significantly from the naive Standard Model expectation and might represent a sign of new physics. It is necessary to evaluate whether this deviation is actually due to new physics or whether it can be accommodated in the Standard Model. In this talk, we discuss a possible explanation of Delta ACP within the SM with the diagrammatic approach. Different D Meson decays can be related by the SU(3) flavor symmetry which can be used to express all charm decay amplitudes by a small number of parameters (topologies). We use this approach and will find that it leads us to a framework in which an unexpectedly large value for Delta ACP arises.

  18. Novel approach to measure the leptonic eta(')->mu+mu- decays via charmed meson decays

    CERN Document Server

    Huong, Nguyen Thu; Viaud, Benoit

    2016-01-01

    In this article, we propose a novel approach to measure the branching ratios of the leptonic eta(')-> mu+mu- decays by using charmed meson decays, namely, D+(s)->pi+ eta(')(->mu+mu-) and D0->K-pi+eta(')(->mu+mu-). We advocate that the data available at LHCb can already yield a new measurement of Br(eta->mu+mu-) with accuracy competitive with the current world average. We also estimate that using the data collected by LHCb between 2015 and 2018 in proton-proton collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.0/fb, the relative uncertainties to this branching ratio can be reduced down to ~10%. We also show that the first observation of Br(eta'->mu+mu-) may be possible with the Upgrade of the LHCb experiment.

  19. Production of the excited charm mesons D1 and D*2 at HERA

    International Nuclear Information System (INIS)

    The production of the excited charm mesons D1(2420) and D*2(2460) in ep collisions has been measured with the ZEUS detector at HERA using an integrated luminosity of 373 pb-1. The masses of the neutral and charged states, the widths of the neutral states, and the helicity parameter of D1(2420)0 were determined and compared with other measurements and with theoretical expectations. The measured helicity parameter of the D01 allows for some mixing of S- and D-waves in its decay to D*±π-+. The result is also consistent with a pure D-wave decay. Ratios of branching fractions of the two decay modes of the D*2(2460)0 and D*2(2460)± states were measured and compared with previous measurements. The fractions of charm quarks hadronising into D1 and D*2 were measured and are consistent with those obtained in e+e- annihilations.

  20. Lecture II. Charmed particle spectroscopy

    International Nuclear Information System (INIS)

    The discussion of charmed particle spectroscopy covers the particle properties and interrelations from a charmed quark composition point of view including SU(4)-symmetry generalities, mesons, baryons, charmed particle masses, and decays of charmed particles. 6 references

  1. Charm meson production in 600 GeV/c π- emulsion interactions

    International Nuclear Information System (INIS)

    We present total and differential cross sections for charm mesons produced in 600 GeV/c π- emulsion interactions. Fits to d2σ/dχFdρT2∝(1-vertical strokeχFvertical stroke)nexp(=bρT2) for 676 electronically reconstructed D mesons with χF>0 give n=4.25±0.24(stat.)±0.23(syst.) and b=0.76±0.03±0.03 (GeV/c)-2. The total inclusive D+ and D0 cross sections are σ(π-N→D±; χF>0)=8.66±0.46±1.96 μb/nucleon and σ(π-N→D0/anti D0; χF>0)=22.05±1.37±4.82 μb/nucleon, where a linear dependence on the mean atomic weight of the target is assumed. These results are compared to next-to-leading order QCD predictions. (orig.)

  2. Three body resonances in two meson-one baryon systems

    OpenAIRE

    Martínez Torres, Alberto; Khemchandani, K. P.; Oset Báguena, Eulogio

    2007-01-01

    We report four $\\Sigma$'s and three $\\Lambda$'s, in the 1500 - 1800 MeV region, as two meson - one baryon S-wave $(1/2)^+$ resonances. We solve Faddeev equations in the coupled channel approach. The invariant mass of one of the meson-baryon pairs and that of the three particles have been varied and peaks in the squared three body $T$-matrix have been found very close to the existing $S$ = -1, $J^P= 1/2^+$ low lying baryon resonances. The input two-body $t$-matrices for meson-meson and meson-b...

  3. Studies on inclusive meson resonance and particle production

    International Nuclear Information System (INIS)

    Production and decay of meson resonances are studied in medium energy meson-proton collisions. Strong evidence is found that hadronic collisions are dominated by resonance production. Especially the vector mesons have often large inclusive cross sections, typically of the order of few millibarns at the present energies. In all, a majority of pions and kaons appear to be decay products of resonances or other unstable particles. The detailed kinematics of the parent resonance's decays is found to play an important role in determining inclusive pion spectra. The squared transverse momentum distributions of hadrons heavier than the pion appear to have in common an exponential behaviour, with a universal slope for the esponential fall-off. The observed vector meson yields suggest that only a small fraction of the direct lepton production observed at large transverse momentum in nucleon-nucleon interactions is accounted for by the ''old'' vector mesons. An attempt has been made to separate out the central production and fragmentation components of the meson production. Both the central production and the fragmentation of the incoming meson are found to be important mechanisms in the non-strange meson production whereas the central production of strange meson resonances is rare at our energies. The ratios of the observed meson yields are found to be generally in good agreement with a simple quark-counting model. (author)

  4. $\\bar B\\to J/\\psi D (\\pi)$ as Smoking Gun Evidence for Intrinsic Charm in $B$ Meson

    CERN Document Server

    Chang, C H V; Chang, Chia-Hung V.; Hou, Wei-Shu

    2001-01-01

    Heavy hadrons may have a higher charm content than light hadrons. A sizable rate for $\\bar B\\to J/\\psi D (\\pi)$, with three charm quarks in final state, would offer distinct evidence for intrinsic charm of $B$ meson since otherwise the process is highly suppressed. Interestingly, both CLEO and Belle data exhibit a low $p_{J/\\psi}$ bump in the inclusive $B\\to J/\\psi + X$ spectrum, which can be attributed to the $J/\\psi D \\pi$ and perhaps $J/\\psi D^{*}$ final states. Further evidence is hinted at by the rather soft $J/\\psi$ spectrum in $\\Upsilon(1S) \\to J/\\psi + X$. Experimental search is strongly urged.

  5. Measurement of (D+D) charm meson pair production in (pp) interactions at \\sqrt{s}=62 GeV

    CERN Document Server

    Basile, M; Cifarelli, L; Contin, A; D'Ali, G; Di Cesare, P; Esposito, B; Giusti, P; Massam, Thomas; Nania, R; Palmonari, F; Sartorelli, G; Valenti, G; Zichichi, A

    1982-01-01

    The charm meson D^{+} is observed in (pp) interactions at 62 GeV centre-of-mass energy, in association with its antimeson, D^{-} or D^{0}. The cross-section for (D^{+}D) pair production is evaluated according to various hypotheses on the production mechanisms. The value of the cross-section is found to be approximately 300 mu b when both the D^{+} and the D are assumed to be 'centrally' produced.

  6. Production of the excited charm mesons D1 and D*2 at HERA

    International Nuclear Information System (INIS)

    The production of the excited charm mesons D1, D*2 and D+s1 in ep collisions has been measured with the ZEUS detector at Hera. The data sample taken by the ZEUS detector in the years 2003-2007, corresponding to an integrated luminosity of 373 pb-1 has been used. The masses of the neutral, charged and strange states, the widths of the neutral states, the helicity parameters of D01 and D+s1 were determined and compared with other measurements and with theoretical expectations. The measured helicity parameters of the D01 and D+s1 allows for some mixing of S- and D-waves in their decays to D*±π-+ and D*±K0 respectively. The measured value of the D01 helicity parameter is also consistent with a pure D-wave decay. Ratios of branching fractions of the two decay modes of the D*02, D*±2 and D+s1 states were measured and compared with previous measurements. The fractions of charm quarks hadronising into D1, D*2 and D+s1 were measured and are consistent with those obtained in e+e- annihilations. The Grid computing technology has a high importance for modern High Energy Physics. This technology has been successfully used in Zeus experiment for the MC simulations and data analysis. The dedicated infrastructure has been maintained by the author since 2010. In addition to continuous support, the author has upgraded and improved the performance of the Grid MC simulations and contributed to the Zeus data preservation project.

  7. Measurement of gluon polarization through spin asymmetry in the production of charmed mesons; Mesure de la polarisation des gluons par l'asymetrie de spin dans la production de mesons charmes

    Energy Technology Data Exchange (ETDEWEB)

    Panebianco, St

    2005-09-15

    The main aim of the COMPASS experiment is the measurement of the gluon polarization in the nucleon, which can be accessed by the spin asymmetry in the scattering of a polarized muon beam on a polarized nucleon target. The process sensitive to the gluon polarization is the photon-gluon fusion, which can be tagged in the cleanest way by looking at the production of D{sup 0} mesons. At COMPASS, D{sup 0} mesons are reconstructed from the invariant mass of their decay products. However, it is a rare process, dominated by a large combinatorial background. This thesis presents some studies devoted to the improvement of the charmed mesons reconstruction. The measurement of the efficiency and the space resolution of the 3 drift chamber stations of the COMPASS spectrometer is a necessary step in understanding the performances of the reconstruction of particle trajectories. The hadron identification, which is fundamental in the reconstruction of charmed meson decay, is performed by a RICH detector. A statistical treatment of signal and background, together with an upgrade project to replace the present front-end electronics, have been developed in order to improve the particle identification performances. The second part of this work concerns the spin asymmetry measurement, which requires the application of event selection criteria in order to minimize the noise over signal ratio in the D{sup 0} invariant mass, and the development of event-weighting methods to reduce the statistical error. This work presents a preliminary result, based on 2002-2004 statistics, which is the {delta}G/G measurement from open charm production. Although the error bars are large, the measured gluon polarization is compatible with zero. Given the present accuracy, this result is compatible with the existing direct measurements from other channels. However, it does not allow to distinguish between different theoretical models. (author)

  8. Electroproduction of Roper Resonance in a Meson Cloud Model

    Institute of Scientific and Technical Information of China (English)

    CHEN Dian-Yong; DONG Yu-Bing

    2008-01-01

    The Q2 dependencies of Roper resonance (N* (1440)) helicity amplitudes have been discussed based on two assumptions:(I) the Roper resonance is an excitation of one of the three quarks,and (ii) the quarks are surrounded by a pion-meson cloud.Our study shows that the mixing of the ground state in the Roper wavefunction caused by the pion meson cloud together with the pion meson cloud itself is crucial for the predictions of the photoproduction amplitudes of the Roper resonance.It is found that our model can give a good description for the helicity amplitudes of the Roper resonance comparing with the experimental measurement.

  9. Study of the doubly-charmed decays of B mesons with the experiment BABAR in SLAC; Etude des desintegrations doublement charmees des mesons B avec l'experience BABAR a SLAC

    Energy Technology Data Exchange (ETDEWEB)

    Robbe, P

    2002-04-01

    The BABAR experiment at SLAC (Stanford linear acceleration center) has been studying since 1999 B meson decays from e{sup +}e{sup -} collisions at the {gamma}(4S) resonance. The first goal of the collaboration was to measure the sin (2{beta}) CP-violation parameter within the standard model. This measurement requires to know with precision the absolute length scale of the detector. A method to test this scale was developed using nuclear interactions in the beam-pipe material. The longitudinal length scale was then determined at the 1 % level precision. The systematic error associated with length measurement in the detector concerning B meson lifetime and B meson oscillation frequency is then negligible with respect to the other errors. The K meson content of B decays is a key ingredient of the sin (2{beta}) measurement and is used to tag the flavour of the other B in events containing a B decaying to a CP eigenstate. The K charge is correlated to the B flavour. Wrong sign kaons, which can dilute B tagging, can come from wrong sign D decays (B{yields} DX). Doubly charmed decays (B{yields} D{sup (*)}D-bar{sup (*)}) K are one possibility to produce wrong sign D decays. The twenty-two decay modes are reconstructed exclusively. The total branching fraction is measured with enough precision to establish that B{yields} D{sup (*)}D-bar{sup (*)} K decays are not the only source of wrong sign D mesons in B decays. (author)

  10. Vector Mesons and Baryon Resonances in Nuclear Matter

    OpenAIRE

    Post, M.; Mosel, U.

    2001-01-01

    We calculate the effect of many-body interactions in nuclear matter on the spectral function of $\\rho$ and $\\omega$ meson. In particular, we focus on the role played by baryon resonances in this context.

  11. Interactions of Charmed Mesons with Light Pseudoscalar Mesons from Lattice QCD and Implications on the Nature of the D*s0(2317)

    Energy Technology Data Exchange (ETDEWEB)

    Liuming, Liu; Orginos, Kostas; Guo, Feng-Kun; Hanhart, Christoph; Meissner, Ulf-G

    2014-11-01

    We study the scattering of light pseudoscalar mesons ( p , K ) off charmed mesons ( D , D s ) in full lattice QCD. The S -wave scattering lengths are calculated using Luscher’s finite volume technique. We use a relativistic formulation for the charm quark. For the light quark, we use domain- wall fermions in the valence sector and improved Kogut-Susskind sea quarks. We calculate the scattering lengths of isospin-3/2 Dπ , D sπ , D s K , isospin-0 DK and isospin-1 DK channels on the lattice. For the chiral extrapolation, we use a chiral unitary approach to next-to-leading order, which at the same time allows us to give predictions for other channels. It turns out that our results support the interpretation of the D*s0( 2317 ) as a DK molecule. At the same time, we also update a prediction for the isospin breaking hadronic decay width G ( D*s0( 2317 )→ D sπ ) to ( 133± 22 ) keV.

  12. Development of fast and radiation hard Monolithic Active Pixel Sensors (MAPS) optimized for open charm meson detection with the CBM - vertex detector

    International Nuclear Information System (INIS)

    The work presented in this thesis addresses a key issue of the CBM experiment at FAIR, which aims to study charm production in heavy ion collisions at energies ranging from 10 to 40 AGeV. For the first time in this kinematical range, open charm mesons will be used as a probe of the nuclear fireball. Despite of their short decay length, which is typically in the order of few 100 μm in the laboratory frame, those mesons will be identified by reconstructing their decay vertex. (orig.)

  13. Development of fast and radiation hard Monolithic Active Pixel Sensors (MAPS) optimized for open charm meson detection with the CBM - vertex detector

    Energy Technology Data Exchange (ETDEWEB)

    Deveaux, Michael

    2008-03-20

    The work presented in this thesis addresses a key issue of the CBM experiment at FAIR, which aims to study charm production in heavy ion collisions at energies ranging from 10 to 40 AGeV. For the first time in this kinematical range, open charm mesons will be used as a probe of the nuclear fireball. Despite of their short decay length, which is typically in the order of few 100 {mu}m in the laboratory frame, those mesons will be identified by reconstructing their decay vertex. (orig.)

  14. Charmed-meson fragmentation functions with finite-mass corrections and their application in various processes

    Energy Technology Data Exchange (ETDEWEB)

    Kneesch, Torben

    2010-12-15

    We have calculated the single-inclusive production cross section of massive quarks in electron-positron-annihilation with next-to-leading order QCD corrections. With these results we have extracted fragmentation functions for the fragmentation from partons into D{sup 0}, D{sup +} and D{sup *} mesons, where we have used experimental data from the B factories Belle and CLEO and from the ALEPH and OPAL experiments at the LEP collider. In our analysis we have included the masses of c and b quarks and of the D mesons and tested the evolution of fragmentation functions with a global fit spanning the B factories' center-of-mass energy of {radical}(s)=10.5 GeV to LEP's run at the Z boson resonance at M{sub Z}. We have applied this fragmentation functions in deep inelastic scattering for comparisons with HERA data using parton cross sections from the literature available in program form. We have then modified this cross section to calculate predictions for deep inelastic two-photon-scattering. By applying the Weizsaecker-Williams spectrum on the real photon we have calculated predictions for LEP1, LEP2 and the future ILC experiments. For ILC we have also included a beamstrahlung spectrum. Finally we have calculated production cross sections for the planned e{gamma} mode of the ILC with the help of a Compton spectrum. (orig.)

  15. Strangeness and charm in nuclear matter

    Science.gov (United States)

    Tolos, Laura; Cabrera, Daniel; Garcia-Recio, Carmen; Molina, Raquel; Nieves, Juan; Oset, Eulogio; Ramos, Angels; Romanets, Olena; Salcedo, Lorenzo Luis

    2013-09-01

    The properties of strange (K, Kbar and K) and open-charm (D, Dbar and D*) mesons in dense matter are studied using a unitary approach in coupled channels for meson-baryon scattering. In the strangeness sector, the interaction with nucleons always comes through vector-meson exchange, which is evaluated by chiral and hidden gauge Lagrangians. For the interaction of charmed mesons with nucleons we extend the SU(3) Weinberg-Tomozawa Lagrangian to incorporate spin-flavor symmetry and implement a suitable flavor symmetry breaking. The in-medium solution for the scattering amplitude accounts for Pauli blocking effects and meson self-energies. On one hand, we obtain the K, Kbar and K spectral functions in the nuclear medium and study their behaviour at finite density, temperature and momentum. We also make an estimate of the transparency ratio of the γA→K+KA‧ reaction, which we propose as a tool to detect in-medium modifications of the K meson. On the other hand, in the charm sector, several resonances with negative parity are generated dynamically by the s-wave interaction between pseudoscalar and vector meson multiplets with 1/2+ and 3/2+ baryons. The properties of these states in matter are analyzed and their influence on the open-charm meson spectral functions is studied. We finally discuss the possible formation of D-mesic nuclei at FAIR energies.

  16. Open charm via D mesons using the ALICE detector at CERN-LHC

    NARCIS (Netherlands)

    Grelli, A.

    2010-01-01

    Charm and bottom quarks have been proposed as probes to study hot quark matter produced in high-energy heavy-ion collisions. The detailed understanding of the charm cross-section in proton-proton collisions as well as the production mechanisms is of considerable interest as QCD test tool and as refe

  17. Electroweak meson production reaction in the nucleon resonance region

    International Nuclear Information System (INIS)

    We report on our recent study of the the neutrino-nucleon reaction in the nucleon resonance region. The dynamical reaction model of meson production reaction on the nucleon for the pion and photon induced reaction has been developed in order to investigate the spectrum of nucleon excited state. We have extended this model in order to describe the weak meson production reactions with the πN, ηN, KΛ, KΣ and ππN final states. We also studied the role of the final state interaction in the photon and the neutrino induced pion production reaction on the deuteron around the Δ(1232) resonance region

  18. Study of Hadronic Five-Body Decays of Charmed Mesons Involving $K_S^0$

    CERN Document Server

    Link, J M; Anjos, J C; Bediaga, I; Göbel, C; Machado, A A; Magnin, J; Massafferri, A; De Miranda, J M; Pepe, I M; Polycarpo, E; Dos Reis, A C; Carrillo, S; Casimiro, E; Cuautle, E; Sánchez-Hernández, A; Uribe, C; Vázquez, F; Agostino, L; Cinquini, L; Cumalat, J P; Jacobs, J; O'Reilly, B; Segoni, I; Wahl, M; Butler, J N; Cheung, H W K; Chiodini, G; Gaines, I; Garbincius, P H; Garren, L A; Gottschalk, E E; Kasper, P H; Kreymer, A E; Kutschke, R; Wang, M; Benussi, L; Bertani, M; Bianco, S; Fabbri, Franco Luigi; Zallo, A; Reyes, M; Cawlfield, C; Kim, D Y; Rahimi, A; Wiss, J; Gardner, R; Kryemadhi, A; Chung, Y S; Kang, J S; Ko, B R; Kwak, J W; Lee, K B; Cho, K; Park, H; Alimonti, G; Barberis, S; Boschini, M; Cerutti, A; D'Angelo, P; Di Corato, M; Dini, P; Edera, L; Erba, S; Giammarchi, M; Inzani, P; Leveraro, F; Malvezzi, S; Menasce, D; Mezzadri, M; Moroni, L; Pedrini, D; Pontoglio, C; Prelz, F; Rovere, M; Sala, S; Davenport, T F; Arena, V; Boca, G; Bonomi, G; Gianini, G; Liguori, G; Merlo, M M; Pantea, D; Lopes-Pegna, D; Ratti, S P; Riccardi, C; Vitulo, P; Hernández, H; López, A M; Luiggi, E; Méndez, H; Paris, A; Ramírez, J E; Zhang, Y; Wilson, J R; Handler, T; Mitchell, R; Engh, D; Hosack, M; Johns, W E; Nehring, M S; Sheldon, P D; Stenson, K; Vaandering, E W; Webster, M; Sheaff, M

    2003-01-01

    We study the decay of $D^0$ and $D^+_s$ mesons into five-body final states including a $K_S^0$ and report the discovery of the decay mode $D_s^+\\to K_S^0 K_S^0\\pi^+\\pi^+\\pi^-$. The branching ratio for the new mode is {${\\Gamma(D_s^+\\to K_S^0K_S^0\\pi^+\\pi^-\\pi^+)} \\over {\\Gamma(D_s^+\\to K_S^0K^-\\pi^+\\pi^+)}$} = 0.102$\\pm0.029\\pm$0.029. We also determine the branching ratio of {${\\Gamma(D^0\\to K_S^0\\pi^+\\pi^+\\pi^-\\pi^-)} \\over {\\Gamma(D^0 \\to K_S^0\\pi^+\\pi^-)}$} = 0.095$\\pm0.005\\pm$0.007 as well as an upper limit for {${\\Gamma(D^0\\to K_S^0K^-\\pi^+\\pi^+\\pi^-)} \\over {\\Gamma(D^0\\to K_S^0\\pi^+\\pi^+\\pi^-\\pi^-)}$} $<$ 0.054 (90% CL). An analysis of the resonant substructure for $D^0 \\to K_S^0\\pi^+\\pi^+\\pi^-\\pi^-$ is also performed.

  19. Study of charm quark fragmentation into D{sup *} mesons with the H1 detector at HERA II

    Energy Technology Data Exchange (ETDEWEB)

    Liptaj, Andrej

    2008-12-15

    In this work charm quark fragmentation into D{sup *} mesons is investigated in deep-inelastic electron proton collisions. This work is based on data collected in the years 2004 - 2007 by the H1 detector at HERA, corresponding to a total integrated luminosity of 354.1 pb{sup -1}. Three observables denoted z{sub jet},z{sub hem} and z{sub hem}{sup (jet)} are measured, each of them meant to approximate the momentum fraction of the charm quark transferred to the D{sup *} meson. In case of z{sub jet} the quark momentum is estimated as the momentum of the D{sup *} jet, for the two other observables it is approximated by the momentum of an appropriately chosen D{sup *} hemisphere. The visible range is defined by the phase space requirements on the DIS events: Q{sup 2} > 5 GeV{sup 2}, 0.05 < y < 0.6 and by the cuts applied on the reconstructed D{sup *{+-}} particles: 1.5 GeV < p{sub T}(D{sup *}) < 15.0 GeV and vertical stroke {eta}(D{sup *}) vertical stroke < 1.5. An additional constraint E{sub T}(D{sup *}jet) > 3.0 GeV enters the phase space definition in case of z{sub jet} and z{sub hem}{sup (jet)}, where a reconstructed jet containing the D{sup *} meson is required. Within this phase space the normalized single differential cross sections are measured in bins of the three observables. Two Monte Carlo models, RAPGAP and CASCADE, both interfaced with the PYTHIA program for the Lund string fragmentation, are used to make predictions of the respective cross sections for different parametrizations (Peterson and Kartvelishvili) of the charm fragmentation function. The difference in cross sections between data and Monte Carlo model predictions for different values of the fragmentation parameter is quantified by calculating values of {chi}{sup 2} in order to extract optimal parameters for the Peterson and Kartvelishvili parametrization. Using predictions from PYTHIA for e{sup +}e{sup -} annihilation optimal parameters are extracted also from the published BELLE and ALEPH data

  20. Single-diffractive production of charmed mesons at the LHC within the $k_t$-factorization approach

    CERN Document Server

    Luszczak, Marta; Szczurek, Antoni; Trzebinski, Maciej

    2016-01-01

    We discuss the single diffractive production of $c \\bar c$ pairs and charmed mesons at the LHC. For a first time we propose a $k_t$-factorization approach to the diffractive processes. The transverse momentum dependent diffractive parton distributions are obtained from standard (collinear) diffractive parton distributions used in the literature. In this calculation the transverse momentum of the pomeron is neglected with respect to transverse momentum of partons entering the hard process. We also perform the first evaluation of the cross sections at the LHC using the diffractive transverse momentum dependent parton distributions. The results of the new approach are compared with those of the standard collinear one. Significantly larger cross sections are obtained in the $k_t$-factorization approach where some part of higher-order effects is effectively included. The differences between corresponding differential distributions are discussed. Finally, we present a feasibility study of the process at the LHC usi...

  1. Study of charm photoproduction using a silicon vertex detector. Measurement of the lifetime of D mesons

    International Nuclear Information System (INIS)

    In this thesis, we were interested in fully reconstructed charmed events, using the results from NA14/2 experiment at CERN. A filtering program, using the active target information, have been developed. D+ and D0 lifetimes have been measured using samples of events with a very good signal to noise ratio. We find values in good agreement with previous experimental results. In addition, the study of the silicon recoil nucleus in the detector enables us, to set a limit on the coherent charm photoproduction cross section

  2. First observation of a narrow charm-strange meson DsJ(2632) -> Ds eta and D0 K+

    CERN Document Server

    Evdokimov, A V; Alkhazov, G; Amaro-Reyes, J; Atamanchuk, A G; Ayan, A S; Balatz, M Y; Bondar, N F; Cooper, P S; Dauwe, L J; Davidenko, G V; Dersch, U; Dolgolenko, A G; Dzyubenko, G B; Edelstein, R; Emediato, L; Endler, A M F; Engelfried, J; Eschrich, I; Escobar, C O; Filimonov, I S; García, F G; Gaspero, M; Giller, I; Golovtsov, V L; Gouffon, P; Gülmez, E; He Kangling; Iori, M; Jun, S Y; Kaya, M; Kilmer, J; Kim, V T; Kochenda, L M; Konorov, I; Kozhevnikov, A P; Krivshich, A G; Krüger, H; Kubantsev, M A; Kubarovskii, V P; Kulyavtsev, A I; Kuropatkin, N P; Kurshetsov, V F; Kushnirenko, A; Kwan, S; Lach, J; Lamberto, A; Landsberg, L G; Larin, I; Leikin, E M; Li Yun Shan; Luksys, M; Lungov, T; Maleev, V P; Mao, D; Mao, C; Mao, Z; Mathew, P; Mattson, M; Matveev, V; McCliment, E; Moinester, M A; Molchanov, V V; Morelos, A; Nelson, K D; Nemitkin, A V; Neoustroev, P V; Newsom, C; Nilov, A P; Nurushev, S B; Ocherashvili, A; Önel, Y M; Ozel, E; Ozkorucuklu, S; Penzo, Aldo L; Petrenko, S V; Pogodin, P I; Procario, M; Ramberg, E; Rappazzo, G F; Razmyslovich, B V; Rud, V I; Russ, J; Schiavon, Paolo; Simón, J; Sitnikov, A I; Skow, D; Smith, V J; Srivastava, M; Steiner, V; Stepanov, V; Stutte, L; Svoiski, M; Terentyev, N K; Thomas, G P; Torres, I; Uvarov, L N; Vasilev, A N; Vavilov, D V; Vazquez-Jauregui, E; Verebryusov, V S; Victorov, V A; Vishnyakov, V E; Vorobyov, A A; Vorwalter, K; You, J; Zhao, W; Zheng, S

    2004-01-01

    We report the first observation of a charm-strange meson DsJ(2632) at a mass of 2632.6+/-1.6 MeV/c^2 in data from SELEX, the charm hadro-production experiment E781 at Fermilab. This state is seen in two decay modes, Ds eta and D0 K+. In the Ds eta decay mode we observe an excess of 49.3 events with a significance of 7.2sigma at a mass of 2635.9+/-2.9 MeV/c^2. There is a corresponding peak of 14 events with a significance of 5.3sigma at 2631.5+/-1.9 MeV/c^2 in the decay mode D0 K+. The decay width of this state is <17 MeV/c^2 at 90% confidence level. The relative branching ratio Gamma(D0K+)/Gamma(Dseta) is 0.16+/-0.06. The mechanism which keeps this state narrow is unclear. Its decay pattern is also unusual, being dominated by the Ds eta decay mode.

  3. Production of the excited charm mesons D{sub 1} and D{sup *}{sub 2} at HERA

    Energy Technology Data Exchange (ETDEWEB)

    Abramowicz, H. [Tel Aviv Univ. (Israel). School of Physics; Max Planck Institute for Physics, Munich (Germany); Abt, I. [Max Planck Institute for Physics, Munich (Germany); Adamczyk, L. [AGH-Univ. of Science and Technology, Krakow (Poland). Faculty of Physics and Applied Computer Science] [and others; Collaboration: ZEUS Collaboration

    2012-08-15

    The production of the excited charm mesons D{sub 1}(2420) and D{sup *}{sub 2}(2460) in ep collisions has been measured with the ZEUS detector at HERA using an integrated luminosity of 373 pb{sup -1}. The masses of the neutral and charged states, the widths of the neutral states, and the helicity parameter of D{sub 1}(2420){sup 0} were determined and compared with other measurements and with theoretical expectations. The measured helicity parameter of the D{sup 0}{sub 1} allows for some mixing of S- and D-waves in its decay to D{sup *{+-}}{pi}{sup -+}. The result is also consistent with a pure D-wave decay. Ratios of branching fractions of the two decay modes of the D{sup *}{sub 2}(2460){sup 0} and D{sup *}{sub 2}(2460){sup {+-}} states were measured and compared with previous measurements. The fractions of charm quarks hadronising into D{sub 1} and D{sup *}{sub 2} were measured and are consistent with those obtained in e{sup +}e{sup -} annihilations.

  4. Measurement of charm meson production in Au+Au collisions at √S NN =200 GEV

    Science.gov (United States)

    Quintero, Amilkar

    The study and characterization of nuclear matter under extreme conditions of temperature and pressure, and a full understanding of deconfined partonic matter, the Quark Gluon Plasma (QGP), are major goals of modern high-energy nuclear physics. Heavy quarks (charm and bottom) are formed mainly in the early stages of the collision. Open heavy flavor measurements, e.g. D0, D+/-, DS, are excellent tools to probe and study the hot and dense medium formed in heavy ion collisions. Details of their interaction with the surrounding medium can be studied through energy loss and elliptic flow measurements thus providing valuable information about the nature of the medium and its degree of thermalization. Initial indirect reconstruction studies of heavy quark particles using the electrons from heavy flavor decays, showed a large magnitude of energy loss that was inconsistent with model predictions and assumptions, at the time. Precise measurements of fully reconstructed heavy mesons would provide better understanding of the energy loss mechanisms and the properties of the formed medium. In relativistic heavy ion collisions, the relatively low abundance of heavy quarks and their short lifetimes makes them difficult to distinguish from the event vertex and the combinatorial background; therefore the need for a high precision vertex detector to reconstruct their decay particles. In 2014 a new micro vertex detector was installed in the STAR experiment at Brookhaven National Lab. The Heavy Flavor Tracker (HFT) was designed to perform direct topological reconstruction of the weak decays of heavy flavor particles. The HFT improves STAR track pointing resolution from a few millimeters to ˜30 microns for 1 GeV/c pions, allowing direct reconstruction of short lifetime particles. Although the results of the open charm meson reconstruction using the HFT improved dramatically there is still a lot of room for optimization, especially for reconstructed particles with low transverse momentum

  5. Heavy quark fragmentation functions for D-wave quarkonium and charmed beauty mesons

    International Nuclear Information System (INIS)

    At the large transverse momentum region, the production of heavy-heavy bound-states such as charmonium, bottomonium, and anti bc mesons in high energy e+e- and hadronic collisions is dominated by parton fragmentation. The authors calculate the heavy quark fragmentation functions into the D-wave quarkonium and anti bc mesons to leading order in the strong coupling constant and in the non-relativistic expansion. In the anti bc meson case, one set of its D-wave states is expected to lie below the open flavor threshold. The total fragmentation probability for a anti b antiquark to split into the D-wave anti bc mesons is about 2 x 10-5, which implies that only 2% of the total pseudo-scalar ground state Bc comes from the cascades of these orbitally excited states

  6. N* and Meson Resonances in J/psi decays

    CERN Document Server

    Zou Bing Song

    2003-01-01

    Over sixty million J/psi events have been collected by the BES Collaboration at the Beijing Electron-Positron Collider (BEPC). J/psi decays provide an excellent place for studying excited nucleons and hyperons -- N*, $\\Lambda^*$, $\\Sigma^*$ and $\\Xi^*$ resonances, as well as meson resonances, including possible glueballs and hybrids. Physics objectives, recent results and future prospects of light hadron spectroscopy at BEPC are presented.

  7. Photoproduction of charmed hadrons

    Energy Technology Data Exchange (ETDEWEB)

    Gardner, R. [Univ. of Illinois, Urbana, IL (United States)

    1994-10-01

    Photoproduction data can be used to test QCD production mechanisms. In this paper the authors present results on the single-inclusive p{sub t}{sup 2} distributions of charm mesons and baryons, correlations between fully reconstructed charm pairs, and production asymmetries between charm and anticharm particles.

  8. Decay constants of charm and beauty pseudoscalar heavy-light mesons on fine lattices

    International Nuclear Information System (INIS)

    We compute decay constants of heavy-light mesons in quenched lattice QCD with a lattice spacing of a ≅ 0.04 fm using non-perturbatively O(a) improved Wilson fermions and O(a) improved currents. We obtain fDs=220(6)(5)(11) MeV, fD=206(6)(3)(22) MeV, fBs=205(7)(26)(17) MeV and fB=191(8)(23)(25) MeV, using the Sommer parameter r0=0.5 fm to set the scale. The first error is statistical, the second systematic and the third from assuming a ±10% uncertainty in the experimental value of r0. A detailed discussion is given in the text. We also present results for the meson decay constants fK and fπ and the ρ meson mass. (orig.)

  9. Combined heavy-quark symmetry and large-Nc operator analysis for 2-body counterterms in the chiral Lagrangian with D mesons and charmed baryons

    Science.gov (United States)

    Samart, Daris; Nualchimplee, Chakrit; Yan, Yupeng

    2016-06-01

    In this work we construct a chiral SU(3) Lagrangian with D mesons of spin JP=0- and JP=1- and charmed baryons of spin JP=1 /2+ and JP=3 /2+. There are 42 leading two-body counterterms involving two charmed baryon fields and two D meson fields in the constructed Lagrangian. The heavy-quark spin symmetry leads to 35 sum rules, while the large-Nc operator analysis predicts 29 at the next-to leading order of the 1 /Nc expansion. The combination of the sum rules from both the heavy-quark symmetry and the large-Nc analysis results in 38 independent sum rules, which reduces the number of free parameters in the chiral Lagrangian to only four. This is a remarkable result demonstrating the consistency of the heavy-quark symmetry and large-Nc operator analysis.

  10. Combined heavy-quark symmetry and large-$N_c$ operator analysis for 2-body counterterms in the chiral Lagrangian with $D$ mesons and charmed baryons

    CERN Document Server

    Samart, Daris; Yan, Yupeng

    2016-01-01

    We construct, in the work, chiral $SU(3)$ Lagrangian with $D$ mesons of spin $J^P=0^-$ and $J^P=1^-$ and charmed baryons of spin $J^P=1/2^+$ and $J^P=3/2^+$. There are 42 leading two-body counter-terms involving two charmed baryon fields and two $D$ meson fields in the constructed Lagrangian. The heavy-quark spin symmetry leads to 35 sum rules while the large-$N_c$ operator analysis predicts 29 ones at the next-to leading order of $1/N_c$ expansion. The combination of the sum rules from both the heavy-quark symmetry and the large-$N_c$ analysis results in 38 independent sum rules which reduces the number of free parameters in the chiral Lagrangian down to 4 only. This is a remarkable result demonstrating the consistency of the heavy-quark symmetry and large-$N_c$ operator analysis.

  11. Measurement of Prompt Charm Meson Production Cross Sections in p anti-p Collisions at s**(1/2) = 1.96 TeV

    CERN Document Server

    Acosta, D; Ahn, M H; Akimoto, T; Albrow, M G; Ambrose, D; Amidei, D; Anastassov, A; Anikeev, K; Annovi, A; Antos, J; Aoki, M; Apollinari, G; Arguin, J F; Arisawa, T; Artikov, A; Asakawa, T; Ashmanskas, W; Attal, A; Azfar, F; Azzi-Bacchetta, P; Bacchetta, N; Bachacou, H; Badgett, W F; Bailey, S; Barbaro-Galtieri, A; Barker, G; Barnes, V E; Barnett, B A; Baroiant, S; Barone, M; Bauer, G; Bedeschi, F; Behari, S; Belforte, S; Bell, W H; Bellettini, Giorgio; Bellinger, J; Benjamin, D; Beretvas, A; Bhatti, A A; Binkley, M; Bisello, D; Bishai, M; Blair, R E; Blocker, C; Bloom, K; Blumenfeld, B; Bocci, A; Bodek, A; Bölla, G; Bolshov, A; Booth, P S L; Bortoletto, Daniela; Boudreau, J; Bourov, S; Bromberg, C; Brozovic, M; Brubaker, E; Budagov, Yu A; Budd, H S; Burkett, K; Busetto, G; Bussey, P; Byrum, K L; Cabrera, S; Calafiura, P; Campanelli, M; Campbell, M; Canepa, A; Carlsmith, D; Carosi, R; Carron, S; Casarsa, M; Caskey, W; Castro, A; Catastini, P; Cauz, D; Cerri, A; Cerri, C; Cerrito, L; Chapman, J; Chen, Y C; Chen, C; Chertok, M; Chiarelli, G; Chlachidze, G; Chlebana, F; Cho, K; Chokheli, D; Chu, M L; Chung, J Y; Chung, Y S; Chung, W H; Ciobanu, C I; Ciocci, M A; Clark, A G; Coca, M N; Connolly, A; Convery, E; Conway, J; Cordelli, M; Cortiana, G; Cranshaw, J; Culbertson, R; Currat, C; Cyr, D; D'Auria, S; D'Onofrio, M; Da Ronco, S; Dagenhart, D; De Cecco, S; De Pedis, D; Dell'Agnello, S; Dell'Orso, Mauro; Demers, S; Demortier, L; Deninno, M; Denis, St; Derwent, P F; Dionisi, C; Dittmann, J R; Doksus, P; Dominguez, A; Donati, S; Dorigo, T; Drollinger, V; Ebina, K; Eddy, N; Ely, R; Erbacher, R D; Erdmann, M; Errede, D; Errede, S; Eusebi, R; Fang, H C; Farrington, S; Fedorko, I; Feild, R G; Feindt, M; Fernández, J P; Ferretti, C; Field, R D; Fiori, I; Flanagan, G; Flaugher, B; Flores-Castillo, L R; Foland, A D; Forrester, S; Foster, G W; Franklin, M; Frisch, H; Fujii, Y; Furic, I; Gallas, A; Gallinaro, M; Galyardt, J; García-Sciveres, M; Garfinkel, F; Gay, C; Gerberich, H; Gerchtein, E; Gerdes, D W; Giagu, S; Giannetti, P; Gibson, K; Gibson, A; Ginsburg, C; Giolo, K; Giordani, M; Giurgiu, G; Glagolev, V; Glenzinski, D A; Gold, M; Goldschmidt, N; Goldstein, J; Goldstein, D B; Gómez, G; Gómez-Ceballos, G; Goncharov, M; Gorelov, I; Goshaw, A T; Gotra, Yu; Goulianos, K; Gresele, A; Grim, G; Grosso-Pilcher, C; Günther, M; Guimaraesda Costa, J; Haber, C; Hahn, S R; Hahn, K; Halkiadakis, E; Hall, C; Handler, R; Happacher, F; Hara, K; Hare, M; Harr, R F; Harris, M; Hartmann, F; Hatakeyama, K; Hauser, J; Hays, C; Heider, E; Heinemann, B; Heinrich, J; Hennecke, M; Herndon, M; Hill, C; Hirschbuehl, D; Höcker, A; Hoffman, K D; Holloway, A; Hou, S; Houlden, M A; Huffman, B T; Hughes, R E; Huston, J; Ikado, K; Incandela, J R; Introzzi, G; Iori, M; Ishizawa, Y; Issever, C; Ivanov, A; Iwata, Y; Iyutin, B; James, E; Jang, D; Jarrell, J; Jeans, D; Jensen, H; Jones, M; Jun, S Y; Junk, T R; Kamon, T; Kang, J; Karagoz-Unel, M; Karchin, E; Kartal, S; Kato, Y; Kemp, Y; Kephart, R D; Kerzel, U; Khazins, D; Khotilovich, V; Kilminster, B; Kim, M J; Kim, B J; Kim, D H; Kim, J E; Kim, M S; Kim, S B; Kim, K; Kim, T H; Kim, H S; Kim, S H; King, T; Kirby, M; Kirk, M; Kirsch, L; Klimenko, S; Knuteson, B; Kobayashi, H; Koehn, P; Kondo, K; Konigsberg, J; Kordas, K; Korn, A J; Korytov, A; Kotelnikov, K A; Kotwal, A V; Kovalev, A; Kraus, J; Kravchenko, I V; Kreymer, A; Kroll, J; Kruse, M; Krutelyov, V; Kuhlmann, S E; Kuznetsova, N; Laasanen, A T; Lai, S; Lami, S; Lammel, S; Lancaster, J; Lancaster, M; Lander, R; Lannon, K; Lath, A; Latino, G; Lauhakangas, R; Lazzizzera, I; LeCompte, T J; Le, Y; Lecci, C; Lee, J; Lee, S W; Leonardo, N; Leone, S; Lewis, J D; Li, K; Lin, C S; Lindgren, M; Liss, T M; Litvintsev, D O; Liu, T; Liu, Y; Lockyer, N S; Loginov, A; Loken, J; Loreti, M; Loverre, P F; Lucchesi, D; Lukens, P; Lyons, L; Lys, J; MacQueen, D; Madrak, R; Maeshima, K; Maksimovic, P; Malferrari, L; Manca, G; Marginean, R; Martin, V; Martin, M; Martin, A; Martínez, M; Maruyama, T; Matsunaga, H; Mattson, M E; Mazzanti, P; McFarland, K S; McGivern, D; McIntyre, P M; McNamara, P; McNulty, R; Menzemer, S; Menzione, A; Merkel, P; Mesropian, C; Messina, A; Meyer, A; Miao, T; Miller, L; Miller, R; Miller, J S; Miquel, R; Miscetti, S; Mishina, M; Mitselmakher, G; Miyamoto, A; Miyazaki, Y; Moggi, N; Moore, R; Morello, M; Moulik, T; Mukherjee, A; Mulhearn, M; Müller, T; Mumford, R; Munar, A; Murat, P; Murgia, S; Nachtman, J; Nahn, S; Nakamura, I; Nakano, I; Napier, A; Napora, R; Necula, V; Nelson, C; Nelson, T; Neu, C; Neubauer, M S; Newman-Holmes, C; Nicollerat, A S; Niell, F; Nielsen, J; Nigmanov, T; Niu, H; Nodulman, L; Österberg, K; Ogawa, T; Oh, Y D; Oh, S; Ohsugi, T; Oishi, R; Okusawa, T; Oldeman, R G C; Orava, Risto; Orejudos, W; Pagliarone, C; Palmonari, F; Paoletti, R; Papadimitriou, V; Partos, D; Pashapour, S; Patrick, J; Pauletta, G; Paulini, M; Pauly, T; Paus, C; Pellett, D; Penzo, Aldo L; Phillips, T J; Piacentino, G; Piedra, J; Pitts, K T; Pompos, A; Pondrom, L; Pope, G; Poukhov, O; Prakoshyn, F; Pratt, T; Pronko, A G; Proudfoot, J; Ptohos, F; Punzi, G; Rademacker, J; Rakitine, A; Rappoccio, S; Ratnikov, F; Ray, H; Reichold, A; Rekovic, V; Renton, P B; Rescigno, M; Rimondi, F; Rinnert, K; Ristori, L; Riveline, M; Robertson, W J; Robson, A; Rodrigo, T; Rolli, S; Rosenson, L; Roser, R; Rossin, R; Rott, C; Ruiz, A; Russ, J; Ryan, D; Saarikko, H; Safonov, A; Sakumoto, W K; Saltzberg, D; Sánchez, C; Sansoni, A; Santi, L; Sarkar, S; Sato, K; Savard, P; Savoy-Navarro, A; Schemitz, P; Schlabach, P; Schmidt, E E; Schmidt, M P; Schmitt, M; Schofield, G L; Scodellaro, L; Scribano, A; Scuri, F; Sedov, A; Seidel, S; Seiya, Y; Semeria, F; Sexton-Kennedy, L; Sfiligoi, I; Shapiro, M D; Shears, T G; Shepard, P F; Shimojima, M; Shochet, M J; Shon, Y; Sidoti, A; Siket, M; Sill, A; Sinervo, P; Sissakian, A N; Skiba, A; Slaughter, A J; Sliwa, K; Smith, R; Snider, F D; Snihur, R; Somalwar, S V; Spalding, J; Spezziga, M; Spiegel, L; Spinella, F; Spiropulu, M; Stadie, H; Stelzer, B; Stelzer-Chilton, O; Strologas, J; Stuart, D; Sukhanov, A; Sumorok, K; Sun, H; Suzuki, T; Taffard, A C; Takach, S F; Takano, H; Takashima, R; Takeuchi, Y; Takikawa, K; Tamburello, P; Tanaka, M; Tanaka, R; Tanimoto, N; Tannenbaum, B; Tapprogge, Stefan; Tecchio, M; Teng, P K; Terashi, K; Tesarek, R J; Tether, S; Thom, J; Thompson, A S; Thomson, E; Thurman-Keup, R M; Tipton, P; Tiwari, V K; Tkaczyk, S M; Toback, D; Tollefson, K; Tonelli, D; Tonnesmann, M; Torre, S; Torretta, D; Trischuk, W; Tseng, J; Tsuchiya, R; Tsuno, S; Tsybychev, D; Turini, N; Turner, M; Ukegawa, F; Unverhau, T; Uozumi, S; Usynin, D; Vacavant, L; Vaiciulis, T; Varganov, A V; Vataga, E; Vejcik, S; Velev, G V; Veramendi, G; Vickey, T; Vidal, R; Vila, I; Vilar, R; Volobuev, I P; Wagner, R G; Wagner, R L; Wagner, W; Wallace, N; Walter, T; Wan, Z; Wang, M J; Wang, S M; Ward, B; Waschke, S; Waters, D; Watts, T; Weber, M; Wester, W; De Barbaro, P; Von der Mey, M

    2003-01-01

    We report on measurements of differential cross sections d sigma/d p_t for prompt charm meson production in p anti-p collisions at s**(1/2) = 1.96 TeV using 5.8 +/- 0.3 pb-1 of data from the CDF II detector at the Fermilab Tevatron. The data are collected with a new trigger that is sensitive to the long lifetime of hadrons containing heavy flavor. The charm meson cross sections are measured in the central rapidity region |y| \\leq 1 in four fully reconstructed decay modes: D0 --> K- pi+, D*+ -> D0 pi+, D+ --> K- pi+ pi+, D+_s--> phi pi+, and their charge conjugates. The measured cross sections are compared to theoretical calculations.

  12. Production of the excited charm mesons D{sub 1} and D{sup *}{sub 2} at HERA

    Energy Technology Data Exchange (ETDEWEB)

    Verbytskyi, Andrii

    2013-02-15

    The production of the excited charm mesons D{sub 1}, D{sup *}{sub 2} and D{sup +}{sub s1} in ep collisions has been measured with the ZEUS detector at Hera. The data sample taken by the ZEUS detector in the years 2003-2007, corresponding to an integrated luminosity of 373 pb{sup -1} has been used. The masses of the neutral, charged and strange states, the widths of the neutral states, the helicity parameters of D{sup 0}{sub 1} and D{sup +}{sub s1} were determined and compared with other measurements and with theoretical expectations. The measured helicity parameters of the D{sup 0}{sub 1} and D{sup +}{sub s1} allows for some mixing of S- and D-waves in their decays to D{sup *{+-}}{pi}{sup -+} and D{sup *{+-}}K{sup 0} respectively. The measured value of the D{sup 0}{sub 1} helicity parameter is also consistent with a pure D-wave decay. Ratios of branching fractions of the two decay modes of the D{sup *0}{sub 2}, D{sup *{+-}}{sub 2} and D{sup +}{sub s1} states were measured and compared with previous measurements. The fractions of charm quarks hadronising into D{sub 1}, D{sup *}{sub 2} and D{sup +}{sub s1} were measured and are consistent with those obtained in e{sup +}e{sup -} annihilations. The Grid computing technology has a high importance for modern High Energy Physics. This technology has been successfully used in Zeus experiment for the MC simulations and data analysis. The dedicated infrastructure has been maintained by the author since 2010. In addition to continuous support, the author has upgraded and improved the performance of the Grid MC simulations and contributed to the Zeus data preservation project.

  13. Evidence for new nucleon resonances from electromagnetic meson production

    Energy Technology Data Exchange (ETDEWEB)

    Volker Burkert

    2012-12-01

    The study of nucleon resonances in electromagnetic meson production with the CLAS detector is discussed. The electromagnetic interaction is complementary to pion scattering in the exploration of the nucleon excitation spectrum. Higher mass states often decouple from the N{pi} channel and are not seen in {pi} N --> {pi} N. Photoproduction of mesons, such as K {Lambda}, {omega} p and {eta}' p may be more sensitive to many of these states. The CLAS detector, combined with the use of energy-tagged polarized photons and polarized electrons, as well as po- larized targets and the measurement of recoil polarization, are the tools needed for a comprehensive nucleon resonance program. Some of the recently published high statistics data sets had significant impact on further clarifying the nucleon excitation spectrum.

  14. Search for narrow resonances lighter than Upsilon mesons

    Energy Technology Data Exchange (ETDEWEB)

    Aaltonen, T.; /Helsinki Inst. of Phys.; Adelman, Jahred A.; /Chicago U., EFI; Akimoto, T.; /Tsukuba U.; Alvarez Gonzalez, B.; /Cantabria Inst. of Phys.; Amerio, S.; /INFN, Padua; Amidei, Dante E.; /Michigan U.; Anastassov, A.; /Northwestern U.; Annovi, Alberto; /Frascati; Antos, Jaroslav; /Comenius U.; Apollinari, G.; /Fermilab; Apresyan, A.; /Purdue U. /Waseda U.

    2009-03-01

    We report a search for narrow resonances, produced in p{bar p} collisions at {radical}s = 1.96 TeV, that decay into muon pairs with invariant mass between 6.3 and 9.0 GeV/c{sup 2}. The data, collected with the CDF II detector at the Fermilab Tevatron collider, correspond to an integrated luminosity of 630 pb{sup -1}. We use the dimuon invariant mass distribution to set 90% upper credible limits of about 1% to the ratio of the production cross section times muonic branching fraction of possible narrow resonances to that of the {Upsilon}(1S) meson.

  15. Nucleon Resonances in Meson Nucleon Scattering with Strangeness Production

    OpenAIRE

    Waluyo, A.; Bennhold, C.; Haberzettl, H.; Penner, G.; Mosel, U.; Mart, T.

    2000-01-01

    An effective Lagrangian model in a coupled channels framework is applied to extract nucleon resonance parameters. In the K-matrix approximation, we simultaneously analyze all the available data for the transitions from pi N to five possible meson-baryon final states, pi N, pipi N, eta N, K Lambda, and KSigma, in the energy range from pi N threshold up to W = 2 GeV. In this work, we focus our efforts on the K Sigma channel. In particular, we include a set of Delta resonances around 1900 MeV: t...

  16. In-medium decay widths of hidden and open charm vector mesons in a field theoretic model for composite hadrons

    International Nuclear Information System (INIS)

    We calculate the decay widths of the charmonium states, J/ψ, ψ(3686) and ψ(3770), to DD¯ pairs, as well as the decay width of D* → Dπ, in isospin asymmetric strange hadronic matter, using a field theoretical model for composite hadrons with quark constituents. For this purpose, we use the quark–antiquark pair creation term of the free Dirac Hamiltonian written in terms of the constituent quark field operators, and use explicit charmonium, D, D¯, D* and π states to evaluate the matrix elements for the charmonium as well as D* decay amplitudes. The medium modifications of the partial decay widths of charmonium to DD¯ pair, arising from the mass modifications of the D(D¯) and the charmonium states calculated in a chiral effective model, are also included. The results of the present investigations are then compared with the decay widths computed earlier, in a model using light quark pair creation in 3P0 state. As in 3P0 model, the decay amplitude in the present model is multiplied with a strength parameter for the light quark pair creation, which is fitted from the observed vacuum decay width. The effects of the isospin asymmetry, the strangeness fraction of the hadronic matter on the masses of the charmonium states and D(D¯) mesons and hence on the decay widths, have also been studied. The isospin asymmetry effect is observed to be dominant for high densities, leading to appreciable difference in the decay channels of the charmonium to D+ D- and D0D¯0 pairs. The decay width of D* → Dπ in the hadronic matter has also been calculated within the composite quark model in the present work, accounting for the medium modifications of the D and D* masses. The density modifications of the charmonium states and D(D*) mesons, which are observed to be appreciable at high densities, will be of relevance in the compressed baryonic matter (CBM) experiments at the future facility of FAIR, GSI, where charmed hadrons will be produced by annihilation of antiprotons on

  17. Collision times in pi-pi and pi-K scattering and spectroscopy of meson resonances

    CERN Document Server

    Kelkar, N G; Khemchandani, K P

    2003-01-01

    Using the concept of collision time (time delay) introduced by Eisenbud and Wigner and its connection to on-shell intermediate unstable states, we study mesonic resonances in pi-pi and pi-K scattering. The time-delay method proves its usefulness by revealing the spectrum of the well-known rho- and K*-mesons and by supporting some speculations on rho-mesons in the 1200 MeV region. We use this method further to shed some light on more speculative meson resonances, among others the enigmatic scalars. We confirm the existence of chiralons below 1 GeV in the unflavoured and strange meson sector.

  18. Study of 1D stranged-charm meson family using HQET

    CERN Document Server

    Gupta, Pallavi

    2015-01-01

    Recently LHCb predicted spin 1 and spin 3 states D* s1(2860) and D* s3(2860) which are studied through their strong decays, and are assigned to fit the 13D1and 13D3 states in the charm spectroscopy. In this paper,using the heavy quark effective theory, we state that assigning D*s1(2860) as the mixing of 13D1 - 23S1 states, is rather a better justification to its observed experimental values than a pure state. We study its decay modes variation with hadronic coupling constant gxh and the mixing angle . We appoint spin 3 state D* s3(2860) as the missing 1D 3- JP state, and also study its decay channel behavior with coupling constant gyh. To appreciate the above results, we check the variation of decay modes for their spin partners states i.e. 1D2 and 1D'2 with their masses and strong coupling constant i.e. gxh and gyh. Our calculation using HQET approach give mixing angle between the 13D1 - 23S1 state for D* s1(2860) to lie in the range (-1.6 radians < theta < -1.2 radians). Our calculation for coupling c...

  19. Study of Hadronic Five-Body Decays of Charmed Mesons Involving $K_S^0$

    OpenAIRE

    The FOCUS collaboration; Link, J. M.

    2003-01-01

    We study the decay of $D^0$ and $D^+_s$ mesons into five-body final states including a $K_S^0$ and report the discovery of the decay mode $D_s^+\\to K_S^0 K_S^0\\pi^+\\pi^+\\pi^-$. The branching ratio for the new mode is {${\\Gamma(D_s^+\\to K_S^0K_S^0\\pi^+\\pi^-\\pi^+)} \\over {\\Gamma(D_s^+\\to K_S^0K^-\\pi^+\\pi^+)}$} = 0.102$\\pm0.029\\pm$0.029. We also determine the branching ratio of {${\\Gamma(D^0\\to K_S^0\\pi^+\\pi^+\\pi^-\\pi^-)} \\over {\\Gamma(D^0 \\to K_S^0\\pi^+\\pi^-)}$} = 0.095$\\pm0.005\\pm$0.007 as wel...

  20. Resonant scattering and charm showers in ultrahigh-energy neutrino interactions

    Science.gov (United States)

    Wilczek, F.

    1985-01-01

    Electron antineutrinos with energy of about 7 x 10 to the 6th GeV have much-enhanced cross sections due to W-boson production off electrons. Possible signals due to cosmic-ray sources are estimated. Higher-energy antineutrinos can efficiently produce a W accompanied by radiation. Another possibility, which could lead to shadowing at modest depths, is resonant production of a charged Higgs particle. The importance of muon production by charm showers in rock is pointed out.

  1. D Pi scattering and D meson resonances from lattice QCD

    CERN Document Server

    Mohler, Daniel; Woloshyn, R M

    2012-01-01

    The masses and widths of the broad scalar D_0^*(2400) and the axial D_1(2430) charmed-light resonances are extracted by simulating the corresponding D Pi and D* Pi scattering on the lattice. The resonance parameters are obtained using a Breit-Wigner fit of the elastic phase shifts. The resulting D_0^*(2400) mass is 351+/-21 MeV above the spin-average 1/4(m_D+3m_{D*}), in agreement with the experimental value of 347+/-29 MeV above. The resulting D_0^* to D Pi coupling g^{lat}=2.55+/-0.21 GeV is close to the experimental value g^{exp}<=1.92+/-0.14 GeV, where g parametrizes the width $\\Gamma\\equiv g^2p^*/s$. The resonance parameters for the broad D_1(2430) are also found close to the experimental values; these are obtained by appealing to the heavy quark limit, where the neighboring resonance D_1(2420) is narrow. The calculated I=1/2 scattering lengths are a_0=0.81+/-0.14 fm for D Pi and a_0=0.81+/-0.17 fm for D* Pi scattering. The simulation of the scattering in these channels incorporates quark-antiquark as...

  2. Strangeness and charm in nuclear matter

    Energy Technology Data Exchange (ETDEWEB)

    Tolos, Laura, E-mail: tolos@ice.csic.es [Instituto de Ciencias del Espacio (IEEC/CSIC), Campus Universitat Autònoma de Barcelona, Facultat de Ciències, Torre C5, E-08193 Bellaterra (Barcelona) (Spain); Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe University, Ruth-Moufang-Str. 1, 60438 Frankfurt am Main (Germany); Cabrera, Daniel [Departamento de Física Teórica II, Universidad Complutense, 28040 Madrid (Spain); Garcia-Recio, Carmen [Departamento de Física Atómica, Molecular y Nuclear, and Instituto Carlos I de Física Teórica y Computacional, Universidad de Granada, E-18071 Granada (Spain); Molina, Raquel [Research Center for Nuclear Physics (RCNP), Mihogaoka 10-1, Ibaraki 567-0047 (Japan); Nieves, Juan; Oset, Eulogio [Instituto de Física Corpuscular (Centro Mixto CSIC-UV), Institutos de Investigación de Paterna, Aptdo. 22085, 46071 Valencia (Spain); Ramos, Angels [Departament d' Estructura i Constituents de la Matèria, Universitat de Barcelona, Diagonal 647, 08028 Barcelona (Spain); Romanets, Olena [Theory Group, KVI, University of Groningen, Zernikelaan 25, 9747 AA Groningen (Netherlands); Salcedo, Lorenzo Luis [Departamento de Física Atómica, Molecular y Nuclear, and Instituto Carlos I de Física Teórica y Computacional, Universidad de Granada, E-18071 Granada (Spain)

    2013-09-20

    The properties of strange (K, K{sup ¯} and K{sup ¯⁎}) and open-charm (D, D{sup ¯} and D{sup ⁎}) mesons in dense matter are studied using a unitary approach in coupled channels for meson–baryon scattering. In the strangeness sector, the interaction with nucleons always comes through vector-meson exchange, which is evaluated by chiral and hidden gauge Lagrangians. For the interaction of charmed mesons with nucleons we extend the SU(3) Weinberg–Tomozawa Lagrangian to incorporate spin–flavor symmetry and implement a suitable flavor symmetry breaking. The in-medium solution for the scattering amplitude accounts for Pauli blocking effects and meson self-energies. On one hand, we obtain the K, K{sup ¯} and K{sup ¯⁎} spectral functions in the nuclear medium and study their behaviour at finite density, temperature and momentum. We also make an estimate of the transparency ratio of the γA→K{sup +}K{sup ⁎−}A{sup ′} reaction, which we propose as a tool to detect in-medium modifications of the K{sup ¯⁎} meson. On the other hand, in the charm sector, several resonances with negative parity are generated dynamically by the s-wave interaction between pseudoscalar and vector meson multiplets with 1/2{sup +} and 3/2{sup +} baryons. The properties of these states in matter are analyzed and their influence on the open-charm meson spectral functions is studied. We finally discuss the possible formation of D-mesic nuclei at FAIR energies.

  3. Semileptonic $B_{(s)}$ decays to excited charmed mesons with $e,\\mu,\\tau$ and searching for new physics with $R(D^{**})$

    CERN Document Server

    Bernlochner, Florian U

    2016-01-01

    Semileptonic $B$ meson decays into the four lightest excited charmed meson states ($D_0^*$, $D_1^*$, $D_1$, and $D_2^*$) and their counterparts with $s$ quarks are investigated, including the full lepton mass dependence. We derive the standard model predictions for the differential branching fractions, as well as predictions for the ratios of the semi-tauonic and light lepton semileptonic branching fractions. These can be systematically improved using future measurements of the total or differential semileptonic rates to $e$ and $\\mu$, as well as the two-body hadronic branching fractions with a pion, related by factorization to the semileptonic rate at maximal recoil. To illustrate the different sensitivities to new physics, we explore the dependence of the ratio of semi-tauonic and light-lepton branching fractions on the type-II two-Higgs-doublet model parameters, $\\tan\\beta$ and $m_{H}^\\pm$, for all four states.

  4. Charm and Strangeness with Heavy-Quark Spin Symmetry

    CERN Document Server

    Tolos, L; Nieves, J; Romanets, O; Salcedo, L L

    2012-01-01

    We study charmed and strange baryon resonances that are generated dynamically within a unitary meson-baryon coupled-channel model which incorporates heavy-quark spin symmetry. This is accomplished by extending the SU(3) Weinberg-Tomozawa chiral Lagrangian to SU(8) spin-flavor symmetry and implementing a strong flavor symmetry breaking. The model generates dynamically resonances with negative parity in all the isospin, spin, and strange and charm sectors that one can form from an s-wave interaction between pseudoscalar and vector meson multiplets with $1/2^+$ and $3/2^+$ baryons. Our results are compared with experimental data from several facilities as well as with other theoretical models. Moreover, we obtain the properties of charmed pseudoscalar and vector mesons in dense matter within this coupled-channel unitary effective model by taking into account Pauli-blocking effects and meson self-energies in a self-consistent manner. We obtain the open-charm meson spectral functions in this dense nuclear environm...

  5. Spectroscopy of di-meson bound states in charm and beauty sector

    International Nuclear Information System (INIS)

    Very recently there exists increasing attention towards the study of four quark states as di-hadronic molecular states followed by the recent discovery of Zc(3900) state by two separate experimental groups BES III and BELLE Collaboration. The interpretation of the new state has triggered a considerable amount of theoretical work, especially due to the controversies related their internal structure. Moreover, very recently BELLE Collaboration has made the tantalizing observation of two new charged bottom resonances, namely Zb(10610) and Zb(10650)

  6. Tests of the infinite mass effective theory and properties of the charming and beautiful mesons

    Energy Technology Data Exchange (ETDEWEB)

    Narison, S. (European Organization for Nuclear Research, Geneva (Switzerland). Theoretical Physics Div.)

    1992-09-01

    Using an operator product expansion (OPE) in the inverse of the heavy quark mass M{sub Q} and a dispersive approach, we rederive the B and B* couplings and the Isgur-Wise function predicted by the infinite mass effective theory (IMET). We find that, at the subtraction point M{sub Q} and using VDM for the spectral function, these observables are governed by the universl light quark condensate. We also find that the corrections induced by finite values of M{sub c} and M{sub b} are large and are due to the splitting {Delta}{sub b} between the ground sate and its radial excitation. We review the determinations of the different decay constants, couplings and masses from QCD spectral sum rules (QSSR). For f{sub B} and f{sub D}, we conclude the optimum average: f{sub B}=(1.59{+-}0.09{+-}0.27)f{sub {pi}} and f{sub D}=(1.31{+-}0.12)f{sub {pi}}, where the main error is due to the quark mass, while the first one in f{sub B} in due to the non-perturbative terms and to the choice of the continuum threshold t{sub c} from the onset of sum rule variable stability until the t{sub c}-stability regions. We also find that the vector coupling {gamma}{sub V} satisfies approximately the IMET M{sub Q}{sup 3/2} mass dependence scaling law, while f{sub P} obeys in units of GeV: f{sub P}/f{sub {pi}}{approx equal}(4.6{+-}0.4) M{sub Q}{sup -1/2} (1-1.56/M{sub Q}+0.88/M{sub Q}{sup 2}), for M{sub Q}{>=}M{sub c}. We also predict the flavour independence: M{sub P}-M{sub Q}{approx equal}0.6-0.7 GeV and M{sub V}-M{sub Q}{approx equal}0.7-0.8 GeV of the mass differences between the mesons and the corresponding quark. Finally, we find that the B{yields}De{nu}{sub e} form factor f{sub +}(0){approx equal}(0.55{+-}0.10) deviates from the naive expectation (f{sub +}(0)=1). (orig.).

  7. Measurement of charm production in deep inelastic scattering using lifetime tagging for D± meson decays with the ZEUS detector at HERA

    International Nuclear Information System (INIS)

    A measurement of charm production in deep inelastic scattering at √(s)=318 GeV at HERA is presented in this thesis. The analysed data were collected with the ZEUS detector during 2005-2007, corresponding to the integrated luminosity of 323 pb-1. Charm production events were identified by the reconstruction of D± mesons in the D±→K-+π±π± decay channel. The phase space of the analysis is defined by 522, 0.02T(D±)±) vertical stroke 2 is the photon virtuality, y is the inelasticity and pT(D±) and η(D±) are the D± transverse momentum and pseudorapidity. Lifetime information was exploited to substantially reduce combinatorial background originating from light flavour production. Single- and double-differential cross sections were measured and compared to next-to-leading order QCD predictions as well as to previously published ZEUS measurements. The charm contribution to the proton structure function F2, Fc2, was extracted. (orig.)

  8. Measurement of charm production in deep inelastic scattering using lifetime tagging for D{sup {+-}} meson decays with the ZEUS detector at HERA

    Energy Technology Data Exchange (ETDEWEB)

    Lisovyi, Mykhailo

    2011-10-15

    A measurement of charm production in deep inelastic scattering at {radical}(s)=318 GeV at HERA is presented in this thesis. The analysed data were collected with the ZEUS detector during 2005-2007, corresponding to the integrated luminosity of 323 pb{sup -1}. Charm production events were identified by the reconstruction of D{sup {+-}} mesons in the D{sup {+-}}{yields}K{sup -+}{pi}{sup {+-}}{pi}{sup {+-}} decay channel. The phase space of the analysis is defined by 5charm contribution to the proton structure function F{sub 2}, F{sub c}{sup 2}, was extracted. (orig.)

  9. Studies of Nucleon Resonance Structure in Exclusive Meson Electroproduction

    CERN Document Server

    Aznauryan, I G; Braun, V; Brodsky, S J; Burkert, V D; Chang, L; Chen, Ch; El-Bennich, B; Cloët, I C; Cole, P L; Edwards, R G; Fedotov, G V; Giannini, M M; Gothe, R W; Lin, Huey-Wen; Kroll, P; Lee, T -S H; Melnitchouk, W; Mokeev, V I; Peña, M T; Ramalho, G; Roberts, C D; Santopinto, E; de Teramond, G F; Tsushima, K; Wilson, D J

    2013-01-01

    Studies of the structure of excited baryons are key to the N* program at Jefferson Lab. Within the first year of data taking with the Hall B CLAS12 detector following the 12 GeV upgrade, a dedicated experiment will aim to extract the N* electrocouplings at high photon virtualities Q2. This experiment will allow exploration of the structure of N* resonances at the highest photon virtualities ever yet achieved, with a kinematic reach up to Q2 = 12 GeV2. This high-Q2 reach will make it possible to probe the excited nucleon structures at distance scales ranging from where effective degrees of freedom, such as constituent quarks, are dominant through the transition to where nearly massless bare-quark degrees of freedom are relevant. In this document, we present a detailed description of the physics that can be addressed through N* structure studies in exclusive meson electroproduction. The discussion includes recent advances in reaction theory for extracting N* electrocouplings from meson electroproduction off pro...

  10. Unquenching the meson spectrum: a model study of excited $\\rho$ resonances

    CERN Document Server

    Rupp, George; van Beveren, Eef

    2016-01-01

    Quark models taking into account the dynamical effects of hadronic decay often produce very different predictions for mass shifts in the hadron spectrum. The consequences for meson spectroscopy can be dramatic and completely obscure the underlying confining force. Recent unquenched lattice calculations of mesonic resonances that also include meson-meson interpolators provide a touchstone for such models, despite the present limitations in applicability. On the experimental side, the $\\rho(770)$ meson and its several observed radial recurrences are a fertile testing ground for both quark models and lattice computations. Here we apply a unitarised quark model that has been successful in the description of many enigmatic mesons to these vector $\\rho$ resonances and the corresponding $P$-wave $\\pi\\pi$ phase shifts. This work is in progress, with encouraging preliminary results.

  11. Quark model calculation of charmed baryon production by neutrinos

    International Nuclear Information System (INIS)

    We study the neutrino production of 25 low-lying charmed baryon resonances in the four flavour quark model. The mass difference of ordinary and charmed quarks is explicitly taken into account. The quark model is used to determine the spectrum of the charmed baryon resonances and the q2 = 0 values of the weak current transition matrix elements. These transition matrix elements are then continued to space-like q2-values by a generalized meson dominance ansatz for a set of suitably chosen invariant form factors. We find that the production of the L = 0 states C0, C1 and C1* is dominant, with the C0 produced most copiously. For L = 1, 2 the Jsup(P) = 3/2- 5/2+ charm states are dominant. We give differential cross sections, total cross sections and energy integrated total cross sections using experimental neutrino fluxes. (orig./BJ)

  12. Hadronic resonance spectrum may help in resolution of meson nonet enigmas

    International Nuclear Information System (INIS)

    The identification of problematic meson states as the members of the quark model qq nonets by using a hadronic resonance spectrum is discussed. The results favor the currently adopted qq assignments for the tensor and 1 3F4 JPC=4++ meson nonets, and suggest a new qq assignments for the scalar and axial-vector nonets which favor the interpretation of the f0(980), f0(1710) and f1(1510) mesons as non-qq objects. We also suggest that the 2 3S1 1/2(1-) state should be identified with the K*(1680) rather than K*(1410) meson. (orig.)

  13. Electroproduction of pseudoscalar mesons above the resonance region

    Energy Technology Data Exchange (ETDEWEB)

    Niczyporuk, B.B. [Continuous Electron beam Accelerator Facility, Newport News, VA (United States)

    1994-04-01

    In this paper, the author has revisited twenty year old data considering the progress achieved in related fields. To make further progress in our understanding of strong interactions, one needs much better quality of exclusive electroproduction data. A measurement of the differential cross section {sigma}(t, W, Q{sup 2}) for the reactions e{sup {minus}} + p {r_arrow} e{sup {minus}} + {pi}{sup +}(K{sup +}) + n({Lambda}{degrees}) at a beam energy of {ge} 4 GeV is proposed. Data will be collected simultaneously for both reactions using the CLAS detector at CEBAF in the following kinematical region: Q{sup 2} > 1 GeV{sup 2} and W > 2 GeV. One of the most interesting aspects of electroproduction is that it can be used to measure photoproduction amplitudes as functions of the photon mass squared Q{sup 2} and momentum transfer t. Emphasis is given to measuring the differential cross sections for t {approximately} m{sup 2}{sub {pi},{kappa}}. Above the resonance region (W > 2 GeV), the cross section is dominated by the amplitudes for scalar photons. Measured angular distributions of produced mesons will be used to estimate the contribution of various amplitudes to the cross sections. High statistics and good quality data collected simultaneously using a large acceptance detector will improve our understanding of nucleon structure as well as the hadronic properties of the photon.

  14. Measurement of charm mixing parameters and the neutral D meson decaying to a negative kaon-positive pion strong phase using quantum correlated neutral D meson-neutral anti-D meson pairs

    Science.gov (United States)

    Lincoln, Adam J.

    The decays of D0 and D0 mesons produced from e +e- annihilations at the psi'' resonance reflect quantum correlations so that decay rates are sensitive to interference between indistinguishable final states. Using the CLEO-c detector at the Cornell Electron Storage Ring, we measure the time-independent decay rates of D0 decays to K-pi +, K+pi-, several CP eigenstates, and semileptonic states. We make use of both partially and fully reconstructed D0 - D0 pairs. A chi2 minimization fitter extracts from these decay rates mixing and doubly Cabibbo suppressed decay parameters x2, y, r 2, and cos delta, along with isolated D 0 branching fractions for all input final states. By constraining the branching fractions and r2 with independent measurements, a first measurement of cos delta can be made.

  15. Inclusive photoproduction of charmed hadrons in VMD

    International Nuclear Information System (INIS)

    On the basis of the vector meson dominance model completed with the fusion model a mechanism of charmed Ladron photoproduction has been developed. In the framework of this mechanism the total cross sections and inclusive spectra for charmed hadrons photoproduction have been calculated. Anti D-meson yields has been obtained to be higher than D-meson ones at low energies, which is connected with pair production of anti D meson and Λsub(c) baryons

  16. Open charm production at HERA

    CERN Document Server

    Karshon, U

    2004-01-01

    Inclusive charm meson production cross sections in the deep inelastic scattering and photoproduction regimes are compared with QCD leading and next-to-leading (NLO) calculations. The NLO predictions are significantly below the data in some parts of the measured kinematic range. Angular distributions of dijet events with charm show clear evidence for the existence of charm originating from the incoming photon. The charm fragmentation function is measured for the first time at HERA. Various fragmentation ratios and the fragmentation fractions of the low-lying charm hadrons are determined and compared to previous e+e- results.

  17. Suppressed decay into open charm for the Y(4260) being an hybrid

    CERN Document Server

    Kou, E

    2005-01-01

    We investigate the Y(4260) resonance recently discovered by the Babar collaboration. We propose the observation of its decay into J/psi pi pi and its non observation into open charm as a consequence of it being a charmonium hybrid state with a magnetic constituent gluon. We prove a selection rule forbidding its decay into two S-wave charmed mesons in any potential model. We suggest a generalisation of the selection rule based only on the heavy quark nature of the charm.

  18. Unsolved problems in hadronic charm decay

    International Nuclear Information System (INIS)

    This paper describes several outstanding problems in the study of hadronic decays of charmed mesons where further experimental work and theoretical understanding is needed. Four topics are stressed: double Cabibbo suppressed decays (DCSD) of D+ mesons, hadronic Ds decays, weak hadronic quasi-two-body decays to pairs of vector mesons, and penguin decays of D mesons. 24 refs., 10 figs., 5 tabs

  19. Comparing mesons and W_L W_L TeV-resonances

    CERN Document Server

    Dobado, Antonio; Llanes-Estrada, Felipe J; Espriu, Domenec

    2015-01-01

    Tantalizing LHC hints suggest that resonances of the Electroweak Symmetry Breaking Sector might exist at the TeV scale. We recall a few key meson-meson resonances in the GeV region that could have high-energy analogues which we compare, as well as the corresponding unitarized effective theories describing them. While detailed dynamics may be different, the constraints of unitarity, causality and global-symmetry breaking, incorporated in the Inverse Amplitude Method, allow to carry some intuition over to the largely unmeasured higher energy domain. If the 2 TeV ATLAS excess advances one such new resonance, this could indicate an anomalous q qbar W coupling.

  20. Hadronic production of S-wave and P-wave charmed beauty mesons via heavy quark fragmentation

    International Nuclear Information System (INIS)

    At hadron colliders the dominant production mechanism of (bar bc) mesons with large transverse momentum is due to parton fragmentation. The authors compute in a model-independent way the production rates and transverse momentum spectra for S-wave and P-wave (bar bc) mesons at the Tevatron via the direct fragmentation of the bottom antiquark as well as the Altarelli-Parisi induced gluon fragmentation. Since all the radially and orbitally excited (bar bc) mesons below the BD flavor threshold will cascade into the pseudoscalar ground state Bc through electromagnetic and/or hadronic transitions, they all contribute to the inclusive production of Bc. The contributions of the excited S-wave and P-wave states to the inclusive production of Bc are 58 and 23%, respectively, and hence significant

  1. Dynamical Coupled-Channel Model of Meson Production Reactions in the Nucleon Resonance Region

    Energy Technology Data Exchange (ETDEWEB)

    T.-S. H. Lee; A. Matsuyama; T. Sato

    2006-11-15

    A dynamical coupled-channel model is presented for investigating the nucleon resonances (N*) in the meson production reactions induced by pions and photons. Our objective is to extract the N* parameters and to investigate the meson production reaction mechanisms for mapping out the quark-gluon substructure of N* from the data. The model is based on an energy-independent Hamiltonian which is derived from a set of Lagrangians by using a unitary transformation method.

  2. Search for Rare and Forbidden 3-body Di-muon Decays of the Charmed Mesons D+ and Ds+

    CERN Document Server

    Link, J M; Anjos, J C; Bediaga, I; Göbel, C; Magnin, J; Massafferri, A; De Miranda, J M; Pepe, I M; Polycarpo, E; Dos Reis, A C; Carrillo, S; Casimiro, E; Cuautle, E; Sánchez-Hernández, A; Uribe, C; Vázquez, F; Agostino, L; Cinquini, L; Cumalat, J P; O'Reilly, B; Segoni, I; Wahl, M; Butler, J N; Cheung, H W K; Chiodini, G; Gaines, I; Garbincius, P H; Garren, L A; Gottschalk, E; Kasper, P H; Kreymer, A E; Kutschke, R; Wang, M; Benussi, L; Bertani, L; Bianco, S; Fabbri, F L; Zallo, A; Reyes, M; Cawlfield, C; Kim, D Y; Rahimi, A; Wiss, J; Gardner, R; Kryemadhi, A; Chung, Y S; Kang, J S; Ko, B R; Kwak, J W; Lee, K B; Cho, K; Park, H; Alimonti, G; Barberis, S; Boschini, M; Cerutti, A; D'Angelo, P; Di Corato, M; Dini, P; Edera, L; Erba, S; Giammarchi, M; Inzani, P; Leveraro, F; Malvezzi, S; Menasce, D; Mezzadri, M; Moroni, L; Pedrini, D; Pontoglio, C; Prelz, F; Rovere, M; Sala, S; Davenport, T F; Arena, V; Boca, G; Bonomi, G; Gianini, G; Liguori, G; Lopes-Pegna, D; Merlo, M M; Pantea, D; Ratti, S P; Riccardi, C; Vitulo, P; Hernández, H; López, A M; Luiggi, E; Méndez, H; Paris, A; Quinones, J; Ramírez, J E; Rolke, W A; Zhang, Y; Wilson, J R; Handler, T; Mitchell, R; Engh, D; Hosack, M; Johns, W E; Nehring, M; Sheldon, P D; Stenson, K; Vaandering, E W; Webster, M; Sheaff, M

    2003-01-01

    Using a high statistics sample of photo-produced charm particles from the FOCUS experiment at Fermilab, we report results of a search for eight rare and Standard-Model-forbidden decays: D+, Ds+ > h+/- muon-/+ muon+ (with h=pion or Kaon). Improvement over previous results by a factor of 1.7--14 is realized. Our branching ratio upper limit D+ > pion+ muon- muon+ of 8.8E-6 at the 90% C.L. is below the current MSSM R-Parity violating constraint.

  3. Heavy meson production at HERA

    Directory of Open Access Journals (Sweden)

    Figiel Jan

    2014-01-01

    Full Text Available The copious production of charm mesons at HERA has allowed QCD to be probed in open charm and charm vector meson production. Elastic and proton-dissociatve photoproduction of J/ψ mesons have been measured at HERA. The data are compared to other measurements and the W and t dependences are parametrised using phenomenological fits. The ψ (2S state has also been measured exclusively and the ratio of its production rate to J/ψ mesons presented as a function of the kinematic variables. Inelastic production of J/ψ and ψ(2S mesons gives insight into non-relativistic QCD and final results are presented here. Open charm production has been measured in order to better understand the fragmentation process of charm mesons as well as giving insight into the structure of the proton.

  4. Time-dependent CP violation measurements in neutral B meson to double-charm decays at the Japanese Belle experiment

    Energy Technology Data Exchange (ETDEWEB)

    Roehrken, Markus

    2012-07-13

    The Belle and BaBar Collaborations experimentally established the existence of CP violating phenomena in the B meson system. In this PhD thesis, the measurements of the branching fraction and the time-dependent CP violation in B{sup 0}→D{sup +}D{sup -} decays based on the final data set of the Belle experiment are presented. Furthermore, the thesis comprises the corresponding measurements in B{sup 0}→D{sup *±}D{sup -+} decays to provide a direct comparison to a related decay. The final Belle data set contains 772 x 10{sup 6} B anti B pairs recorded on the Υ(4S)-resonance at the asymmetric-energy KEKB e{sup +}e{sup -}-collider. The measurement of the time evolution allows the experimental determination of time-dependent CP violating asymmetries. The results of the measurements of branching fractions are B(B{sup 0}→D{sup +}D{sup -})=(2.12±0.16(stat.)±0.18(syst.)) x 10{sup -4}; B(B{sup 0}→D{sup *±}D{sup -+})=(6.14±0.29(stat.)±0.50(syst.)) x 10{sup -4}. The results of the measurement of time-dependent CP violation in B{sup 0}→D{sup +}D{sup -} decays are S{sub D{sup +}D{sup -}}=-1.06{sup +0.21}{sub -0.14}(stat.)±0.08(syst.); C{sub D{sup +}D{sup -}}=-0.43±0.16(stat.)±0.05(syst.). This measurement excludes the conservation of CP symmetry in B{sup 0}→D{sup +}D{sup -} decays, equivalent to S{sub D{sup +}D{sup -}}=C{sub D{sup +}D{sup -}}=0, at a confidence level of 1-2.7 x 10{sup -5} corresponding to a significance of 4.2σ. The results of the measurement of time-dependent CP violation in B{sup 0}→D{sup *±}D{sup -+} decays are A{sub D{sup *}D}=+0.06±0.05(stat.)±0.02(syst.); S{sub D{sup *}D}=-0.78±0.15(stat.)±0.05(syst.); C{sub D{sup *}D}=-0.01±0.11(stat.)±0.04(syst.); ΔS{sub D{sup *}D}=-0.13±0.15(stat.)±0.04(syst.); ΔC{sub D{sup *}D}=+0.12±0.11(stat.)±0.03(syst.). This measurement excludes the conservation of CP symmetry in B{sup 0}→D{sup *±}D{sup -+} decays, equivalent to A{sub D{sup *}D}=S{sub D{sup *}D}=C{sub D{sup *}D}=0, at a

  5. Time-dependent CP violation measurements in neutral B meson to double-charm decays at the Japanese Belle experiment

    International Nuclear Information System (INIS)

    The Belle and BaBar Collaborations experimentally established the existence of CP violating phenomena in the B meson system. In this PhD thesis, the measurements of the branching fraction and the time-dependent CP violation in B0→D+D- decays based on the final data set of the Belle experiment are presented. Furthermore, the thesis comprises the corresponding measurements in B0→D*±D-+ decays to provide a direct comparison to a related decay. The final Belle data set contains 772 x 106 B anti B pairs recorded on the Υ(4S)-resonance at the asymmetric-energy KEKB e+e--collider. The measurement of the time evolution allows the experimental determination of time-dependent CP violating asymmetries. The results of the measurements of branching fractions are B(B0→D+D-)=(2.12±0.16(stat.)±0.18(syst.)) x 10-4; B(B0→D*±D-+)=(6.14±0.29(stat.)±0.50(syst.)) x 10-4. The results of the measurement of time-dependent CP violation in B0→D+D- decays are SD+D-=-1.06+0.21-0.14(stat.)±0.08(syst.); CD+D-=-0.43±0.16(stat.)±0.05(syst.). This measurement excludes the conservation of CP symmetry in B0→D+D- decays, equivalent to SD+D-=CD+D-=0, at a confidence level of 1-2.7 x 10-5 corresponding to a significance of 4.2σ. The results of the measurement of time-dependent CP violation in B0→D*±D-+ decays are AD*D=+0.06±0.05(stat.)±0.02(syst.); SD*D=-0.78±0.15(stat.)±0.05(syst.); CD*D=-0.01±0.11(stat.)±0.04(syst.); ΔSD*D=-0.13±0.15(stat.)±0.04(syst.); ΔCD*D=+0.12±0.11(stat.)±0.03(syst.). This measurement excludes the conservation of CP symmetry in B0→D*±D-+ decays, equivalent to AD*D=SD*D=CD*D=0, at a confidence level of 1-6.8 x 10-5 corresponding to a significance of 4.0σ. In both decay modes, the CP violation is driven by mixing-induced CP violation. In B0→D*±D-+ decays, no direct CP violation is observed.

  6. Measurement of the mixing parameters of neutral charm mesons and search for indirect $CP$ violation with $D^0 \\to K^0_S \\pi^+ \\pi^-$ decays at LHCb

    CERN Document Server

    AUTHOR|(CDS)2082358; Gersabeck, Marco

    The hadronic decay $D^0 \\to K^0_S \\pi^+ \\pi^-$ provides direct access to the measurement of the mixing parameters of the neutral charm meson system and allows to test for indirect $CP$ violation. Mixing is a time-dependent phenomenon for which the time evolution of the transition amplitude of a $D^0 \\, (\\bar{D}^0)$ decay to the final state $K^0_S\\pi^+\\pi^-$ has to be considered. The parameters driving those time-dependent oscillations are $x \\equiv (m_1-m_2)/\\Gamma$ and $y \\equiv (\\Gamma_1-\\Gamma_2)/(2\\Gamma)$. The $CP$ violation parameters $|q/p|$ and $\\phi=\\arg(q,p)$ describe the superposition of the flavour eigenstates $D^0$ and $\\bar{D}^0$ and of the physical eigenstates $D_1$ and $D_2$, $|D_{1,2}\\rangle = p |{D^0}\\rangle \\pm q |{\\bar{D}^0}\\rangle$. By measuring the time- and phase-space dependent distribution of $D^0 \\to K^0_S \\pi^+ \\pi^-$ decays, the mixing parameters can be extracted and a search for indirect $CP$ violation can be performed. This thesis reports a measurement of the mixing parameters a...

  7. Implications of CP-violation in charmed hadrons

    International Nuclear Information System (INIS)

    I discuss theoretical implications of recent experimental progress in understanding CP-violation in charmed mesons. I review recent standard model predictions and attempts to constrain beyond the standard model scenarios using observations of charm hadron transitions

  8. The Lifetime of a beautiful and charming meson: B_c lifetime measured using the D0 detector

    Energy Technology Data Exchange (ETDEWEB)

    Welty-Rieger, Leah Christine; /Indiana U.

    2008-09-01

    Using approximately 1.3 fb{sup -1} of data collected by the D0 detector between 2002 and 2006, the lifetime of the B{sub c}{sup {+-}} meson is studied in the B{sub c}{sup {+-}} {yields} J/{psi}{mu}{sup {+-}} + X final state. Using an unbinned likelihood simultaneous fit to J/{psi} + {mu} invariant mass and lifetime distributions, a signal of 810 {+-} 80(stat.) candidates is estimated and a lifetime measurement made of: {tau}(B{sub c}{sup {+-}}) = 0.448{sub -0.036}{sup +0.038}(stat) {+-} 0.032(sys) ps.

  9. Study of Cabibbo Suppressed Decays of the D$_{s}^{+}$ Charmed-Strange Meson involving a K$_{S}^{0}$

    CERN Document Server

    Link, J M; Anjos, J C; Bediaga, I; Castromonte, C; Machado, A A; Magnin, J; Massafferri, A; De Miranda, J M; Pepe, I M; Polycarpo, E; Dos Reis, A C; Carrillo, S; Casimiro, E; Cuautle, E; Sánchez-Hernández, A; Uribe, C; Vázquez, F; Agostino, L; Cinquini, L; Cumalat, J P; Frisullo, V; O'Reilly, B; Segoni, I; Stenson, K; Tucker, R S; Butler, J N; Cheung, H W K; Chiodini, G; Gaines, I; Garbincius, P H; Garren, L A; Gottschalk, E; Kasper, P H; Kreymer, A E; Kutschke, R; Wang, M; Benussi, L; Bianco, S; Fabbri, F L; Zallo, A; Reyes, M; Cawlfield, C; Kim, D Y; Rahimi, A; Wiss, J; Gardner, R; Kryemadhi, A; Chung, Y S; Kang, J S; Ko, B R; Kwak, J W; Lee, K B; Cho, K; Park, H; Alimonti, G; Barberis, S; Boschini, M; Cerutti, A; D'Angelo, P; Di Corato, M; Dini, P; Edera, L; Erba, S; Inzani, P; Leveraro, F; Malvezzi, S; Menasce, D; Mezzadri, M; Moroni, L; Pedrini, D; Pontoglio, C; Prelz, F; Rovere, M; Sala, S; Davenport, T F; Arena, V; Boca, G; Bonomi, G; Gianini, G; Liguori, G; Lopes-Pegna, D; Merlo, M M; Pantea, D; Ratti, S P; Riccardi, C; Vitulo, P; Göbel, C; Otalora, J; Hernández, H; López, A M; Méndez, H; Paris, A; Quinones, J; Ramírez, J E; Zhang, Y; Wilson, J R; Handler, T; Mitchell, R; Engh, D; Hosack, M; Johns, W E; Luiggi, E; Nehring, M; Sheldon, P D; Vaandering, E W; Webster, M; Sheaff, M

    2008-01-01

    We study the decay of Ds meson into final states involving a Ks and report the discovery of Cabibbo suppressed decay modes Ds -> Kspi-pi+pi+ (179 +/- 36 events) and Ds -> Kspi+ (113 +/-26 events). The branching ratios for the new modes are Gamma(Ds -> Kspi-pi+pi+)/Gamma(Ds -> KsK-pi+pi+) = 0.18 +/- 0.04 +/- 0.05 and Gamma(Ds -> Kspi+)/Gamma(Ds -> KsK+) = 0.104 +/- 0.024 +/- 0.013.

  10. Measurement of the left-right forward-backward asymmetry for charm quarks with D*+ and D+ mesons

    International Nuclear Information System (INIS)

    We present a direct measurement of Ac=2vcac/(v2c+a2c) from the left-right forward-backward asymmetry of D*+ and D+ mesons in Z0 events produced with the longitudinally polarized SLAC Linear Collider beam. These Z0→c over bar events are tagged on the basis of event kinematics and decay topology from a sample of hadronic Z0 decays recorded by the SLAC Large Detector. We measure A0c = 0.73 ± 0.22(stat) ± 0.10(syst). copyright 1995 The American Physical Society

  11. Nuclear dynamics of bound eta mesons: Eta-mesic nuclei and mesic compound-nucleus resonances

    International Nuclear Information System (INIS)

    The theory of eta-mesic nuclei is reviewed and the experiments designed to search for them are described. A theory of mesic compound nuclear resonances is presented which allow a study of the effects of eta-nucleus bound states on other meson-nucleus reactions in which the eta is not being observed. 7 refs., 8 figs

  12. Charm from hadron collisions

    International Nuclear Information System (INIS)

    Ever since the discovery of charmed mesons in electron-positron annihilations at SLAC and DESY, a considerable effort has gone into looking for them in other types of reactions. Both neutrino interactions and photoproduction have provided further data on the production and decay of D mesons, but little has emerged concerning purely hadronic studies.some results from a CERN/Collège de France/Heidelberg/Karlsruhe collaboration using the Split Field Magnet at the CERN Intersecting Storage Rings (ISR) now show definite signs of D meson production in proton-proton collisions

  13. Hyperon AND Hyperon Resonance Properties From Charm Baryon Decays At BaBar

    Energy Technology Data Exchange (ETDEWEB)

    Ziegler, Veronique; /Iowa U.

    2007-07-03

    This report describes studies of hyperons and hyperon resonances produced in charm baryon decays at BABAR. Using two-body decays of the {Xi}{sub c}{sup 0} and {Omega}{sub c}{sup 0}, it is shown, for the first time, that the spin of the {omega}{sup -} is 3/2. The {Omega}{sup -} analysis procedures are extended to three-body final states and properties of the {Xi}(1690){sup 0} are extracted from a detailed isobar model analysis of the {Lambda}{sub c}{sup +} {yields} {Lambda}{bar K}{sup 0}K{sup +} Dalitz plot. The mass and width values of the {Xi}(1690){sup 0} are measured with much greater precision than attained previously. The hypothesis that the spin of the {Xi}(1690) resonance is 1/2 yields an excellent description of the data, while spin values 3/2 and 5/2 are disfavored. The {Lambda}a{sub 0}(980){sup +} decay mode of the {Lambda}{sub c}{sup +} is observed for the first time. Similar techniques are then used to study {Xi}(1530){sup 0} production in {Lambda}{sub c}{sup +} decay. The spin of the {Xi}(1530) is established for the first time to be 3/2. The existence of an S-wave amplitude in the {Xi}{sup -}{pi}{sup +} system is shown, and its interference with the {Xi}(1530){sup 0} amplitude provides the first clear demonstration of the Breit-Wigner phase motion expected for the {Xi}(1530). The {Xi}{sup -}{pi}{sup +} mass distribution in the vicinity of the {Xi}(1690){sup 0} exhibits interesting structure which may be interpreted as indicating that the {Xi}(1690) has negative parity.

  14. Charmed and light pseudoscalar meson decay constants from four-flavor lattice QCD with physical light quarks

    CERN Document Server

    Bazavov, A; Bouchard, C M; DeTar, C; Du, D; El-Khadra, A X; Foley, J; Freeland, E D; Gámiz, E; Gottlieb, Steven; Heller, U M; Kim, J; Komijani, J; Kronfeld, A S; Laiho, J; Levkova, L; Mackenzie, P B; Neil, E T; Simone, J N; Sugar, R; Toussaint, D; Van de Water, R S; Zhou, R

    2014-01-01

    We compute the leptonic decay constants $f_{D^+}$, $f_{D_s}$, and $f_{K^+}$, and the quark-mass ratios $m_c/m_s$ and $m_s/m_l$ in unquenched lattice QCD using the experimentally determined value of $f_{\\pi^+}$ for normalization. We use the MILC Highly Improved Staggered Quark (HISQ) ensembles with four dynamical quark flavors --- up, down, strange, and charm --- and with both physical and unphysical values of the light sea-quark masses. The use of physical pions removes the need for a chiral extrapolation, thereby eliminating a significant source of uncertainty in previous calculations. Four different lattice spacings ranging from $a\\approx 0.06$ fm to $0.15$ fm are included in the analysis to control the extrapolation to the continuum limit. Our primary results are $f_{D^+} = 212.6(0.4)({}^{+1.0}_{-1.2})\\ \\mathrm{MeV}$, $f_{D_s} = 249.0(0.3)({}^{+1.1}_{-1.5})\\ \\mathrm{MeV}$, and $f_{D_s}/f_{D^+} = 1.1712(10)({}^{+29}_{-32})$, where the errors are statistical and total systematic, respectively. The errors on ...

  15. The Lifetime of a beautiful and charming meson: Bc lifetime measured using the D0 detector

    Energy Technology Data Exchange (ETDEWEB)

    Welty-Rieger, Leah Christine [Indiana Univ., Bloomington, IN (United States)

    2008-09-01

    Using approximately 1.3 fb-1 of data collected by the D0 detector between 2002 and 2006, the lifetime of the Bc± meson is studied in the Bc± → J/Ψμ± + X final state. Using an unbinned likelihood simultaneous fit to J/Ψ + μ invariant mass and lifetime distributions, a signal of 810 ± 80(stat.) candidates is estimated and a lifetime measurement made of: τ(Bc±) = 0.448-0.036+0.038(stat) ± 0.032(sys) ps.

  16. Regge spectra, symmetry breaking effects and decays of old and new mesons in dual resonance amplitudes

    International Nuclear Information System (INIS)

    Single-term Veneziano dual amplitude with non-degenerate Regge slopes are examined in detail. Factorization of parent resonance residues and the equal spacing rule extracted from the universal slope case are used to determine all the leading meson trajectory parameters in terms of that of the rho. Relations between non-degenerate slopes and SU(4) symmetry breaking effects are discussed. The predicted meson mass spectra and the partial decay widthsnto two pseudoscalars are shown to agree well with data for the cases in which data exist. (orig.)

  17. Meson Cloud Effect on △(1232) Resonance Transition Properties with a Relativistic Quark Model Approach

    Institute of Scientific and Technical Information of China (English)

    DONG Yu-Bing; FENG Qing-Guo

    2002-01-01

    Based on a relativistic quark model approach, the transition properties of the first nucleon resonance △(1232), and the coupling constants gπNN, g△πN are investigated. Tvo different vays to remove the center of mass motion are considered. The results of the relativistic approaches with and without center ofmass correction are compared with those of nonrelativistic constituent quark model. Moreover, pion meson cloud effect on these calculated observables is explicitly addressed. Better results are obtained by taking the pion meson cloud into account.

  18. $K^{*}$ vector meson resonances dynamics in heavy-ion collisions

    CERN Document Server

    Ilner, Andrej; Markert, Christina; Bratkovskaya, Elena

    2016-01-01

    We study the strange vector meson ($K^*, \\bar K^*$) dynamics in relativistic heavy-ion collisions based on the microscopic Parton-Hadron-String Dynamics (PHSD) transport approach which incorporates partonic and hadronic degrees-of-freedom, a phase transition from hadronic to partonic matter - Quark-Gluon-Plasma (QGP) - and a dynamical hadronization of quarks and antiquarks as well as final hadronic interactions. We investigate the role of in-medium effects on the $K^*, \\bar K^*$ meson dynamics by employing Breit-Wigner spectral functions for the $K^*$'s with self-energies obtained from a self-consistent coupled-channel G-matrix approach. Furthermore, we confront the PHSD calculations with experimental data for p+p, Cu+Cu and Au+Au collisions at energies up to $\\sqrt{{s}_{NN}} = 200$~GeV. Our analysis shows that at relativistic energies most of the final $K^*$s (observed experimentally) are produced during the late hadronic phase, dominantly by the $K+ \\pi \\to K^*$ channel, such that the fraction of the $K^*$s...

  19. On the role of sigma-particle and other resonances in low-energy mesonic processes

    International Nuclear Information System (INIS)

    Using the principle of the most conformity of the QCD and real world objects we argue that σ-meson and other q-barq scalar mesons are the natural elements of the Chiral Theory. An existence of the light isoscalar σ-meson allows to understand many interesting features of Κ-decays. In ππ scattering, σ exchange gives the main contribution into phase shifts at energy near threshold and together with intermediate spin 1 and spin 2 resonances allows to obtain a good description of the phase shifts δ00(s), δ02(s), δ11(s), δ20(s) and δ22(s) for √s≤1 GeV. (author)

  20. Resonances gone topsy turvy - the charm of QCD or new physics in $b \\to s \\ell^+ \\ell^-$?

    CERN Document Server

    Lyon, James

    2014-01-01

    We investigate the interference pattern of the charm-resonances $\\Psi(3370,4040,4160,4415)$ with the electroweak penguin operator $O_9$ in the branching fraction of $B^+\\to K^+\\mu\\mu$. For this purpose we extract the charm vacuum polarisation via a standard dispersion relation from BESII-data on $e^+e^-\\to hadrons$. In the factorisation approximation (FA) the vacuum polarisation describes the interference fully non-perturbatively. The observed interference pattern by the LHCb collaboration is opposite in sign and and significantly enhanced as compared to the FA. A change of the FA-result by a factor of -2.5, which correspond to a 350%-corrections, results in a reasonable agreement with the data. This raises the question on the size of non-factorisable corrections which are colour enhanced but loop-suppressed. In the parton picture it is found that the corrections are of relative size ~-0.5 when averaged over the open charm-region which is far below -3.5 needed to explain the observed effect. We present combin...

  1. Charmed baryon search in hadronic interactions with 150 GeV/c incident protons

    International Nuclear Information System (INIS)

    The hadronic associated production of charmed particles in pBe-interactions at 150 GeV incident momentum is studied. The experiment exploits the fact that charmed particles are produced in pairs and that one of the pair can decay with a single electron in the final state. This electron is used as a tag on charmed particle production. An elaborate system has been developed to suppress the background due to electrons from photon conversion or from the Dalitz decay of mesons. Measuring instruments and data analysis are described. The author reviews the history of the charmed quark and the experimental status of charm observation. The emphasis is put on the observation and production mechanisms of charmed baryons. Finally he presents the results from his study of charmed baryon production. The measurement of known resonances and the capability of the experimental set-up to measure the Λsub(c)+ is discussed. From the absence of a signal in the mass spectra of three different decay channels of the Λsub(c)+ he derives a 90 percent C.L. upper limit of (57 +- 5) μb for Λsub(c)+D production. For the pK-π+ decay channel he applied several kinematical Λsub(c)+D production models. The results are compared with those from other experiments studying the hadronic production of charmed baryons at approximately the same energy of 16.8 GeV. (Auth.)

  2. Experimental investigations of production of glueballs and meson resonant states

    International Nuclear Information System (INIS)

    The major efforts reported have been directed toward investigating glueballs and non-strange mesons. The g/sub T/(2050), g/sub T'/(2300), and g/sub T''/(2350) have been observed in the OZI forbidden reaction π-p → phi phi n. Their characteristics are explained within the context of quantum chromodynamics as being produced by 1 to 3 primary glueballs. It is proposed to increase the present statistics in order to reduce the effective partial wave analysis resolution, and to begin to study the high vertical bar t' vertical bar region. It is further planned to pursue coupled channel analysis of high precision π-p → K/sub s/0K/sub s/0n data and other relevant world data in the 2++, 0++, and 4++ channels. A program is planned to investigate K-p and p anti p interactions at 8 GeV/c

  3. New Exotic Meson and Baryon Resonances from Doubly Heavy Hadronic Molecules.

    Science.gov (United States)

    Karliner, Marek; Rosner, Jonathan L

    2015-09-18

    We predict several new exotic doubly heavy hadronic resonances, inferring from the observed exotic bottomoniumlike and charmoniumlike narrow states X(3872), Z_{b}(10610), Z_{b}(10650), Z_{c}(3900), and Z_{c}(4020/4025). We interpret the binding mechanism as mostly molecularlike isospin-exchange attraction between two heavy-light mesons in a relative S-wave state. We then generalize it to other systems containing two heavy hadrons which can couple through isospin exchange. The new predicted states include resonances in meson-meson, meson-baryon, baryon-baryon, and baryon-antibaryon channels. These include those giving rise to final states involving a heavy quark Q=c,b and antiquark Q[over ¯]^{'}=c[over ¯],b[over ¯], namely, DD[over ¯]^{*}, D^{*}D[over ¯]^{*}, D^{*}B^{*}, B[over ¯]B^{*}, B[over ¯]^{*}B^{*}, Σ_{c}D[over ¯]^{*}, Σ_{c}B^{*}, Σ_{b}D[over ¯]^{*}, Σ_{b}B^{*}, Σ_{c}Σ[over ¯]_{c}, Σ_{c}Λ[over ¯]_{c}, Σ_{c}Λ[over ¯]_{b}, Σ_{b}Σ[over ¯]_{b}, Σ_{b}Λ[over ¯]_{b}, and Σ_{b}Λ[over ¯]_{c}, as well as corresponding S-wave states giving rise to QQ^{'} or Q[over ¯]Q[over ¯]^{'}. PMID:26430989

  4. Interaction of vector mesons with baryons and nuclei

    International Nuclear Information System (INIS)

    After some short introductory remarks on particular issues on the vector mesons in nuclei, in this paper, we present a short review of recent developments concerning the interaction of vector mesons with baryons and with nuclei from a modern perspective using the local hidden gauge formalism for the interaction of vector mesons. We present results for the vector–baryon interaction and in particular for the resonances which appear as composite states, dynamically generated from the interaction of vector mesons with baryons, taking also the mixing of these states with pseudoscalars and baryons into account. We then venture into the charm sector, reporting on hidden charm baryon states around 4400 MeV, generated from the interaction of vector mesons and baryons with charm, which have a strong repercussion on the properties of the J/ΨN interaction. We also address the interaction of K* with nuclei and make suggestions to measure the predicted huge width in the medium by means of transparency ratio. The formalism is extended to study the phenomenon of J/ψ suppression in nuclei via J/ψ photo-production reactions. (author)

  5. Charmed and light pseudoscalar meson decay constants from four-flavor lattice QCD with physical light quarks

    Energy Technology Data Exchange (ETDEWEB)

    Bazavov, A.; Bernard, C.; Komijani, J.; Bouchard, C. M.; DeTar, C.; Foley, J.; Levkova, L.; Du, D.; Laiho, J.; El-Khadra, A. X.; Freeland, E. D.; Gámiz, E.; Gottlieb, Steven; Heller, U. M.; Kim, J.; Toussaint, D.; Kronfeld, A. S.; Mackenzie, P. B.; Simone, J. N.; Van de Water, R. S.; Zhou, R.; Neil, E. T.; Sugar, R.

    2014-10-30

    ="false">(10)(+29-32), where the errors are statistical and total systematic, respectively. The errors on our results for the charm decay constants and their ratio are approximately 2–4 times smaller than those of the most precise previous lattice calculations. We also obtain fK+/fπ

  6. Narrow resonances in the system of two π--mesons

    International Nuclear Information System (INIS)

    The study of the production of exotic 4-quark resonances with isotopic spin I=2 in the π-π--systems from the reaction np→ppπ+π-π- was carried out using the data obtained in the irradiation of 1m H2 bubble chambers of LHE, JINR by neutrons at the momentum Pn=5.20±0.13 GeV/c. A number of enhancements was found at the masses of 0.330; 0.354; 0.397; 0.447; 0.510; 0.569; 0.650; 0.736; 0.822, and 0.920 GeV/c2. Experimental widths of resonances are comparable with the resolution that is linearly increasing from 1.4 to 15.0 MeV/c2 (σres) under alteration of masses from the sum of masses of pions to ≅1 GeV/c2. An attempt was made to determine the spins of resonances. For the resonances at the mass of 0.397 GeV/c2, the most probable value of spin was proved to be equal to J≥6. 3 refs., 3 figs. 1 tab

  7. Heavy meson production at Saturne: the role of baryon resonances

    International Nuclear Information System (INIS)

    A selection of experiments performed at SATURNE which demonstrate the role played by N* resonances is presented. Nucleon-nucleon and proton-deuteron reactions are discussed and analyzed. Recent theoretical interpretations are also briefly described. (R.P.) 27 refs., 20 figs

  8. Search for narrow resonances below the Upsilon mesons

    Energy Technology Data Exchange (ETDEWEB)

    Apollinari, G.; Barone, M.; Carithers, W.; Dell' Orso, M.; Dorigo, T.; Fiori, I; Franklin, M.; Giannetti, P.; Giromini, P.; Happacher, F.; Miscetti, S.; Parri, A.; Ptohos,; Velev, G.; /Frascati /Fermilab /Harvard U. /LBL, Berkeley /INFN, Pisa /Pisa U. /Pisa, Scuola Normale Superiore /Padua U. /INFN, Padua

    2005-07-01

    The authors have investigated the invariant mass spectrum of dimuons collected by the CDF experiment during the 1992-1995 run of the Fermilab Tevatron collider to improve the limit on the existence of narrow resonances set by the experiments at the SPEAR e{sup +}e{sup -} collider. In the mass range 6.3-9.0 GeV/c{sup 2} they derive an average 90% upper credible limit of 8 eV to the leptonic width of possible resonances. This limit is much worse at the mass of 7.2 GeV/c{sup 2} due to an excess of 250 {+-} 61 events with a width consistent with the detector resolution.

  9. Excited Charm States

    International Nuclear Information System (INIS)

    Characteristics of mass spectra and decays of orbitally excited charm mesons and baryons, expected on the basis of quark models and Heavy Quark Symmetry, are briefly described. The difficulties associated with measurements on these excited states are discussed. The accuracy and reliability of currently available experimental information is examined. The reasons, for the widely accepted spin-parity assignments to the observed excited mesons and baryons, are stated. Finally, the experimental data, with the accepted spin-parity assignments, is compared with expectations based on quark models and Heavy Quark Symmetry

  10. Flavor mixing and charm decay

    International Nuclear Information System (INIS)

    The results of mixing matrix determination and their implications on heavy quark decays are given. The decays of charm mesons D0, D+, F+ into two pseudoscalar mesons are discussed in the framework of SU(3) symmetry. The charm decays are also discussed in terms of quark diagrams. It is demonstrated that the differences observed in the lifetimes of D0 and D+, and in the branching ratios B(D0 → K-K+) and B(D0 → π-π+) can be easily incorporated. 3 figures

  11. Searching for New Physics with Charm

    OpenAIRE

    Petrov, Alexey A.

    2010-01-01

    I provide a comprehensive review of indirect searches for New Physics with charmed mesons. I discuss current theoretical and experimental challenges and successes in understanding decays and mixings of those mesons. I argue that in many New Physics scenarios strong constraints, that surpass those from other search techniques, could be placed on the allowed model parameter space using the existent data from studies of charm transitions. This has direct implications for direct searches of physi...

  12. Study of orbitally excited $B$ mesons and evidence for a new $B\\pi$ resonance

    CERN Document Server

    Aaltonen, Timo Antero; Amidei, Dante E; Anastassov, Anton Iankov; Annovi, Alberto; Antos, Jaroslav; Apollinari, Giorgio; Appel, Jeffrey A; Arisawa, Tetsuo; Artikov, Akram Muzafarovich; Asaadi, Jonathan A; Ashmanskas, William Joseph; Auerbach, Benjamin; Aurisano, Adam J; Azfar, Farrukh A; Badgett, William Farris; Bae, Taegil; Barbaro-Galtieri, Angela; Barnes, Virgil E; Barnett, Bruce Arnold; Barria, Patrizia; Bartos, Pavol; Bauce, Matteo; Bedeschi, Franco; Behari, Satyajit; Bellettini, Giorgio; Bellinger, James Nugent; Benjamin, Douglas P; Beretvas, Andrew F; Bhatti, Anwar Ahmad; Bland, Karen Renee; Blumenfeld, Barry J; Bocci, Andrea; Bodek, Arie; Bortoletto, Daniela; Boudreau, Joseph Francis; Boveia, Antonio; Brigliadori, Luca; Bromberg, Carl Michael; Brucken, Erik; Budagov, Ioulian A; Budd, Howard Scott; Burkett, Kevin Alan; Busetto, Giovanni; Bussey, Peter John; Butti, Pierfrancesco; Buzatu, Adrian; Calamba, Aristotle; Camarda, Stefano; Campanelli, Mario; Canelli, Florencia; Carls, Benjamin; Carlsmith, Duncan L; Carosi, Roberto; Carrillo Moreno, Salvador; Casal Larana, Bruno; Casarsa, Massimo; Castro, Andrea; Catastini, Pierluigi; Cauz, Diego; Cavaliere, Viviana; Cavalli-Sforza, Matteo; Cerri, Alessandro; Cerrito, Lucio; Chen, Yen-Chu; Chertok, Maxwell Benjamin; Chiarelli, Giorgio; Chlachidze, Gouram; Cho, Kihyeon; Chokheli, Davit; Clark, Allan Geoffrey; Clarke, Christopher Joseph; Convery, Mary Elizabeth; Conway, John Stephen; Corbo, Matteo; Cordelli, Marco; Cox, Charles Alexander; Cox, David Jeremy; Cremonesi, Matteo; Cruz Alonso, Daniel; Cuevas Maestro, Javier; Culbertson, Raymond Lloyd; D'Ascenzo, Nicola; Datta, Mousumi; de Barbaro, Pawel; Demortier, Luc M; Marchese, Luigi Marchese; Deninno, Maria Maddalena; Devoto, Francesco; D'Errico, Maria; Di Canto, Angelo; Di Ruzza, Benedetto; Dittmann, Jay Richard; D'Onofrio, Monica; Donati, Simone; Dorigo, Mirco; Driutti, Anna; Ebina, Koji; Edgar, Ryan Christopher; Elagin, Andrey L; Erbacher, Robin D; Errede, Steven Michael; Esham, Benjamin; Farrington, Sinead Marie; Feindt, Michael; Fernández Ramos, Juan Pablo; Field, Richard D; Flanagan, Gene U; Forrest, Robert David; Franklin, Melissa EB; Freeman, John Christian; Frisch, Henry J; Funakoshi, Yujiro; Galloni, Camilla; Garfinkel, Arthur F; Garosi, Paola; Gerberich, Heather Kay; Gerchtein, Elena A; Giagu, Stefano; Giakoumopoulou, Viktoria Athina; Gibson, Karen Ruth; Ginsburg, Camille Marie; Giokaris, Nikos D; Giromini, Paolo; Giurgiu, Gavril A; Glagolev, Vladimir; Glenzinski, Douglas Andrew; Gold, Michael S; Goldin, Daniel; Golossanov, Alexander; Gomez, Gervasio; Gomez-Ceballos, Guillelmo; Goncharov, Maxim T; González López, Oscar; Gorelov, Igor V; Goshaw, Alfred T; Goulianos, Konstantin A; Gramellini, Elena; Grinstein, Sebastian; Grosso-Pilcher, Carla; Group, Robert Craig; Barreiro Guimaraes da Costa, Joao; Hahn, Stephen R; Han, Ji-Yeon; Happacher, Fabio; Hara, Kazuhiko; Hare, Matthew Frederick; Harr, Robert Francis; Harrington-Taber, Timothy; Hatakeyama, Kenichi; Hays, Christopher Paul; Heinrich, Joel G; Herndon, Matthew Fairbanks; Hocker, James Andrew; Hong, Ziqing; Hopkins, Walter Howard; Hou, Suen Ray; Hughes, Richard Edward; Husemann, Ulrich; Hussein, Mohammad; Huston, Joey Walter; Introzzi, Gianluca; Iori, Maurizio; Ivanov, Andrew Gennadievich; James, Eric B; Jang, Dongwook; Jayatilaka, Bodhitha Anjalike; Jeon, Eun-Ju; Jindariani, Sergo Robert; Jones, Matthew T; Joo, Kyung Kwang; Jun, Soon Yung; Junk, Thomas R; Kambeitz, Manuel; Kamon, Teruki; Karchin, Paul Edmund; Kasmi, Azeddine; Kato, Yukihiro; Ketchum, Wesley Robert; Keung, Justin Kien; Kilminster, Benjamin John; Kim, DongHee; Kim, Hyunsoo; Kim, Jieun; Kim, Min Jeong; Kim, Soo Bong; Kim, Shin-Hong; Kim, Young-Kee; Kim, Young-Jin; Kimura, Naoki; Kirby, Michael H; Knoepfel, Kyle James; Kondo, Kunitaka; Kong, Dae Jung; Konigsberg, Jacobo; Kotwal, Ashutosh Vijay; Kreps, Michal; Kroll, IJoseph; Kruse, Mark Charles; Kuhr, Thomas; Kurata, Masakazu; Laasanen, Alvin Toivo; Lammel, Stephan; Lancaster, Mark; Lannon, Kevin Patrick; Latino, Giuseppe; Heck, Martin; Lee, Hyun Su; Lee, Jaison; Leo, Sabato; Leone, Sandra; Lewis, Jonathan D; Limosani, Antonio; Lipeles, Elliot David; Lister, Alison; Liu, Hao; Liu, Qiuguang; Liu, Tiehui Ted; Lockwitz, Sarah E; Loginov, Andrey Borisovich; Lucà, Alessandra; Lucchesi, Donatella; Lueck, Jan; Lujan, Paul Joseph; Lukens, Patrick Thomas; Lungu, Gheorghe; Lys, Jeremy E; Lysak, Roman; Madrak, Robyn Leigh; Maestro, Paolo; Malik, Sarah Alam; Manca, Giulia; Manousakis-Katsikakis, Arkadios

    2014-01-01

    Using the full CDF Run II data sample, we report evidence for a new resonance, which we refer to as B(5970), found simultaneously in the $B^0\\pi^+$ and $B^+\\pi^-$ mass distributions with a significance of 4.4 standard deviations. We further report the first study of resonances consistent with orbitally excited $B^{+}$ mesons and an updated measurement of the properties of orbitally excited $B^0$ and $B_s^0$ mesons. Using samples of approximately 8400 $B^{**0}$, 3300 $B^{**+}$, 1350 $B^{**0}_s$, 2600 $B(5970)^0$, and 1400 $B(5970)^+$ decays, we measure the masses and widths of all states, as well as the product of the relative production rate of $B_1$ and $B_2^*$ states times the branching fraction into a $B^{0,+}$ meson and a charged particle. Furthermore, we measure the branching fraction of the $B_{s2}^{*0} \\rightarrow B^{*+} K^-$ decay relative to the $B_{s2}^{*0} \\rightarrow B^{+} K^-$ decay, the production rate times the branching fraction of the B(5970) state relative to the $B_{2}^{*0,+}$ state, and th...

  13. A tau -- charm -- factory at Argonne

    International Nuclear Information System (INIS)

    Depending on the beam energy setting, the τ -- charm -- factory will be optimized to study physics with τ leptons, with charmed mesons, or with charmonium states. This report gives a short overview of the physics of these topics. Also discussed are the detectors and the costs associated with this project

  14. Charmed Tetraquarks Tcc and Tcs from Dynamical Lattice QCD Simulations

    CERN Document Server

    Ikeda, Yoichi; Aoki, Sinya; Doi, Takumi; Hatsuda, Tetsuo; Inoue, Takashi; Ishii, Noriyoshi; Murano, Keiko; Nemura, Hidekatsu; Sasaki, Kenji

    2013-01-01

    Charmed tetraquarks $T_{cc}=(cc\\bar{u}\\bar{d})$ and $T_{cs}=(cs\\bar{u}\\bar{d})$ are studied through the S-wave meson-meson interactions, $D$-$D$, $\\bar{K}$-$D$, $D$-$D^{*}$ and $\\bar{K}$-$D^{*}$, on the basis of the (2+1)-flavor lattice QCD simulations with the pion mass $m_{\\pi} \\simeq $410, 570 and 700 MeV. For the charm quark, the relativistic heavy quark action is employed to treat its dynamics on the lattice. Using the HAL QCD method, we extract the S-wave potentials in lattice QCD simulations, from which the meson-meson scattering phase shifts are calculated. The phase shifts in the isospin triplet ($I$=1) channels indicate repulsive interactions, while those in the $I=0$ channels suggest attraction, growing as $m_{\\pi}$ decreases. This is particularly prominent in the $T_{cc} (J^P=1^+,I=0)$ channel, though neither bound state nor resonance are found in the range $m_{\\pi} =410-700$ MeV. We make a qualitative comparison of our results with the phenomenological diquark picture.

  15. Charmed tetraquarks Tcc and Tcs from dynamical lattice QCD simulations

    Science.gov (United States)

    Ikeda, Yoichi; Charron, Bruno; Aoki, Sinya; Doi, Takumi; Hatsuda, Tetsuo; Inoue, Takashi; Ishii, Noriyoshi; Murano, Keiko; Nemura, Hidekatsu; Sasaki, Kenji

    2014-02-01

    Charmed tetraquarks Tcc=(ccubardbar) and Tcs=(csubardbar) are studied through the S-wave meson-meson interactions, D-D, Kbar-D, D-D* and Kbar-D*, on the basis of the (2+1)-flavor lattice QCD simulations with the pion mass mπ≃410, 570 and 700 MeV. For the charm quark, the relativistic heavy quark action is employed to treat its dynamics on the lattice. Using the HAL QCD method, we extract the S-wave potentials in lattice QCD simulations, from which the meson-meson scattering phase shifts are calculated. The phase shifts in the isospin triplet (I=1) channels indicate repulsive interactions, while those in the I=0 channels suggest attraction, growing as mπ decreases. This is particularly prominent in the Tcc (JP=1+,I=0) channel, though neither bound state nor resonance are found in the range mπ=410-700 MeV. We make a qualitative comparison of our results with the phenomenological diquark picture.

  16. Masses of charmed particles, decay modes and lifetimes

    International Nuclear Information System (INIS)

    Basic characteristics of charmed particles obtained up to the middle of 1981 are discussed in the survey. Stated in brief are main predictions of the theory on charmed particles properties. Experimental data on masses, decay modes and lifetimes of D and F mesons as well as charmed baryons are considered. Basic experiments are described. It is pointed out that in the experiments single and pair production events as well as charmed particle decay have been observed. The charmed particles lifetime lies within the limits of 10-12 - 10-13C. The lifetime of D+- mesons is approximately three times longer than the D0 mesons lifetime. The lifetime of F mesons and Λsub(e) baryons is close to D0 mesons lifetime

  17. Study of the K Kπ meson resonances produced in antiproton proton annihilations at 750 MeV/c

    International Nuclear Information System (INIS)

    In this work we present an analysis of the antiproton proton annihilations into strange particles at 700 and 750 MeV/c, restricted to the four and five body final states. We study in detail the resonances decaying into the K Kπ; system, in particular the D and E mesons. For the D meson we present a determination of i ts mass, width, isospin, G-parity, C-parity and spin. For the E meson we present parametrizations of the complete final state which decrease its statistical significance in this type of production. (Author)

  18. Resonance catalyzed CP asymmetries in D -> P l+ l-

    OpenAIRE

    Fajfer, Svjetlana; Kosnik, Nejc

    2012-01-01

    Recently observed increase of direct CP asymmetry in charm meson nonleptonic decays is difficult to explain within the SM. If this effect is induced by new physics, this might be investigated in other charm processes. We propose to investigate new CP violating effects in rare decays $D \\to P \\ell^+ \\ell^-$, which arise due to the interference of resonant part of the long distance contribution and the new physics affected short distance contribution. Performing a model independent analysis, we...

  19. B mesons: Beauty without charm

    International Nuclear Information System (INIS)

    'Charmless' B decays were observed last year by the CLEO and ARGUS experiments at the CESR and DORIS electron-positron rings at Cornell and DESY, Hamburg, which provides important new input for the six-quark picture

  20. Scattering phases for meson and baryon resonances on general moving-frame lattices

    Energy Technology Data Exchange (ETDEWEB)

    Goeckeler, M. [Regensburg Univ. (Germany). Institut fuer Theoretische Physik; Horsley, R. [Edinburgh Univ. (United Kingdom). School of Physics and Astronomy; Lage, M.; Rusetsky, A. [Bonn Univ. (Germany). Helmholtz-Inst. fuer Strahlen- und Kernphysik and Bethe Center for Theoretical Physics; Meissner, U.G. [Bonn Univ. (Germany). Helmholtz-Inst. fuer Strahlen- und Kernphysik and Bethe Center for Theoretical Physics; Forschungszentrum Juelich GmbH (Germany). Inst. fuer Kernphysik; Forschungszentrum Juelich (Germany). Juelich Center for Hadron Physics and JARA - High Performance Computing; Rakow, P.E.L. [Liverpool Univ. (United Kingdom). Theoretical Physics Division; Schierholz, G. [Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Zanotti, J.M. [Adelaide Univ., SA (Australia). CSSM, School of Chemistry and Physics

    2012-06-15

    A proposal by Luescher enables one to compute the scattering phases of elastic two-body systems from the energy levels of the lattice Hamiltonian in a finite volume. In this work we generalize the formalism to S-, P- and D-wave meson and baryon resonances, and general total momenta. Employing nonvanishing momenta has several advantages, among them making a wider range of energy levels accessible on a single lattice volume and shifting the level crossing to smaller values of m{sub {pi}}L.

  1. Search for a narrow charmed baryonic state decaying to $D^{*\\pm}p^{\\mp}$ in ep collisions at HERA

    CERN Document Server

    Chekanov, S; Abramowicz, H; Adamczyk, L; Adamus, M; Adler, V; Aghuzumtsyan, G; Antonioli, P; Antonov, A; Arneodo, M; Bailey, D S; Bamberger, A; Barakbaev, A N; Barbagli, G; Barbi, M; Bari, G; Barreiro, F; Bartsch, D; Basile, M; Bauerdick, L A T; Behrens, U; Bell, M; Bellagamba, L; Benen, A; Bertolin, A; Bhadra, S; Bloch, I; Bodmann, B; Bold, T; Boos, E G; Borras, K; Boscherini, D; Brock, I; Brook, N H; Brugnera, R; Brümmer, N; Bruni, A; Bruni, G; Bussey, P J; Butterworth, J M; Bylsma, B; Caldwell, A; Capua, M; Cara Romeo, G; Carli, T; Carlin, R; Catterall, C D; Chiochia, V; Chwastowski, J; Ciborowski, J; Ciesielski, R; Cifarelli, Luisa; Cindolo, F; Cloth, P; Cole, J E; Collins-Tooth, C; Contin, A; Cooper-Sarkar, A M; Coppola, N; Cormack, C; Corradi, M; Corriveau, F; Cottrell, A; D'Agostini, Giulio; Dal Corso, F; Danilov, P; Dannheim, D; De Pasquale, S; Dementiev, R K; Derrick, M; Deshpande, Abhay A; Devenish, R C E; Dhawan, S; Dolgoshein, B A; Doyle, A T; Drews, G; Durkin, L S; Dusini, S; Eisenberg, Y; Ermolov, P F; Eskreys, Andrzej; Ferrando, J; Ferrero, M I; Figiel, J; Filges, D; Foster, B; Foudas, C; Fourletov, S; Fourletova, J; Fricke, U; Fusayasu, T; Gabareen, A; Gallo, E; Garfagnini, A; Geiser, A; Genta, C; Gialas, I; Giusti, P; Gladilin, L K; Gladkov, D; Glasman, C; Gliga, S; Goers, S; Golubkov, Yu A; Goncalo, R; González, O; Göttlicher, P; Grabowska-Bold, I; Grijpink, S; Grzelak, G; Gutsche, O; Gwenlan, C; Haas, T; Hain, W; Hall-Wilton, R; Hamatsu, R; Hamilton, J; Hanlon, S; Hart, J C; Hartmann, H; Hartner, G; Hartner, G F; Heaphy, E A; Heath, G P; Heath, H F; Helbich, M; Heusch, C A; Hilger, E; Hillert, S; Hirose, T; Hochman, D; Holm, U; Iacobucci, G; Iga, Y; Inuzuka, M; Irrgang, P; Jakob, H P; Jones, T W; Kagawa, S; Kahle, B; Kaji, H; Kananov, S; Kappes, A; Kataoka, Y; Yamazaki, M; Katkov, I I; Katz, U F; Kcira, D; Khein, L A; Kim, J Y; Kim, Y K; Kind, O; Kisielewska, D; Kitamura, S; Klimek, K; Koffeman, E; Kohno, T; Kooijman, P; Koop, T; Korzhav, I A; Kotanski, A; Kötz, U; Kowal, A M; Kowal, M; Kowalski, H; Kowalski, T; Krakauer, D; Kramberger, G; Kreisel, A; Krumnack, N; Kuze, M; Kuzmin, V A; Labarga, L; Labes, H; Lainesse, J; Lammers, S; Lee, J H; Lee, S W; Lelas, D; Levchenko, B B; Levman, G M; Levy, A; Li, L; Lightwood, M S; Lim, H; Lim, I T; Limentani, S; Ling, T Y; Liu, X; Löhr, B; Lohrmann, E; Loizides, J H; Long, K R; Longhin, A; Lukina, O Yu; Lupi, A; Luzniak, P; Maddox, E; Magill, S; Mankel, R; Margotti, A; Marini, G; Martin, J F; Mastroberardino, A; Matsuzawa, K; Mattingly, M C K; McCubbin, N A; Mellado, B; Melzer-Pellmann, I A; Menary, S R; Metlica, F; Meyer, U; Milite, M; Mirea, A; Monaco, V; Montanari, A; Moritz, M; Musgrave, B; Nagano, K; Nania, R; Nguyen, C N; Nigro, A; Ning, Y; Nishimura, T; Notz, D; Nowak, R J; Oh, B Y; Olkiewicz, K; Pac, M Y; Padhi, S; Paganis, S; Palmonari, F; Parenti, A; Park, I H; Patel, S; Paul, E; Pavel, N; Pawlak, J M; Pelfer, P G; Pellegrino, A; Pesci, A; Petrucci, M C; Piotrzkowski, K; Plucinsky, P P; Pokrovskiy, N S; Polini, A; Posocco, M; Proskuryakov, A S; Przybycien, M B; Rautenberg, J; Raval, A; Reeder, D D; Ren, Z; Renner, R; Repond, J; Riveline, U; Karshon, M; Robins, S; Rodrigues, E; Rosin, M; Rurua, L; Ruspa, M; Sacchi, R; Salehi, H; Sartorelli, G; Savin, A A; Saxon, D H; Schagen, S; Schioppa, M; Schlenstedt, S; Schmidke, W B; Schneekloth, U; Sciulli, F; Scott, J; Selonke, F; Shcheglova, L M; Skillicorn, I O; Slominski, W; Smith, W H; Soares, M; Solano, A; Son, D; Sosnovtsev, V V; Stairs, D G; Stanco, L; Standage, J; Stifutkin, A; Stoesslein, U; Stonjek, S; Stopa, P; Straub, P B; Suchkov, S; Susinno, G; Suszycki, L; Sutton, M R; Sztuk, J; Szuba, D; Szuba, J; Tandler, J; Tapper, A D; Tapper, R J; Tassi, E; Tawara, T; Terron, J; Tiecke, H G; Tokushuku, K; Tsurugai, T; Turcato, M; Tymieniecka, T; Ukleja, A; Ukleja, J; Vázquez, M; Velthuis, J J; Vlasov, N N; Voss, K C; Walczak, R; Walsh, R; Wang, M; Weber, A; Wessoleck, H; West, B J; Whitmore, J J; Wick, K; Wiggers, L; Wills, H H; Wing, M; Wolf, G; Yamada, S; Yamashita, T; Yoshida, R; Youngman, C; Zawiejski, L; Zeuner, W; Zhautykov, B O; Zichichi, A; Ziegler, A; Zotkin, S A; De Wolf, E; Del Peso, J

    2004-01-01

    A resonance search has been made in the D^*+/- p^-/+ invariant-mass spectrum with the ZEUS detector at HERA using an integrated luminosity of 126 pb^-1. The decay channels D^*+ -> D^0 pi^+_s -> (K^- pi^+) pi^+_s and D^*+ -> D^0 pi^+_s -> (K^- pi^+ pi^+ pi^-) pi^+_s (and the corresponding antiparticle decays) were used to identify D^*+/- mesons. No resonance structure was observed in the D^*+/- p^-/+ mass spectrum from more than 60000 reconstructed D^*+/- mesons. The results are not compatible with a report of the H1 Collaboration of a charmed pentaquark, Theta^0_c.

  2. Charm baryons

    International Nuclear Information System (INIS)

    This paper contains a discussion of the spectrum of the lowest-lying charm baryons and review the experimental status of the masses of charm baryons and briefly comment on theoretical attempts to understand their spectroscopy. Lifetime measurements and lifetime hierarchies suggested by the interplay of various theoretical mechanisms contributing to the decay and semileptonic decays of charm baryons are discussed. It also treats exclusive nonleptonic charm baryon decays, where there are more data to be compared to theoretical modeling, and contains a summary and an outlook on future charm baryon experiments

  3. ARGUS results on beauty and charm

    International Nuclear Information System (INIS)

    Using the ARGUS detector at the e+e- storage ring DORIS II at DESY new results on beauty and charm physics have been obtained. With more data an update on B0B-bar0 mixing is given for the mixing parameter r = (21±6) %. The investigation of the decay B-bar0 → D*+l-ν allows a determination of the Kobayashi-Maskawa element |Vcb| = 0.052±0.011. The lifetime ratio of charged and neutral B mesons is measured to be τB+/τB0 = 1.00±0.23±0.14. In semileptonic B decays, as well as in exclusive B decays, no significant signals are found for b→u or b→s transitions. In charm physics, the spin of the D*(2459) is shown to be J=2. The enhancement, previously known as the D*(2420), seen in the final state D*(2010)+π-, is resolved into two relatively narrow resonances separated in mass by approximately 40 MeV/c2. The results of a decay angular analysis are in good agreement with the interpretation of the two states as L=1 D mesons of spin-parities 1+ and 2+. The charged isospin partner of the D*(2459)0 is observed at a mass of (2469±4±6) MeV/c2, decaying to D0π+. The isospin mass splitting is measured to be (14±5±8) MeV/c2. Finally, the first excited P-wave Ds meson has been observed in the decay D*s(2536) → D*+Ks0. (author)

  4. Charm Quark Thermodynamics

    International Nuclear Information System (INIS)

    Full text: Recently, the question of the charm quark contribution to the thermodynamics of the QGP has received some attention. In particular at the high temperatures that can be reached in heavy ion collisions at the LHC a better understanding the thermal contribution of charm to bulk thermodynamics will become relevant. Lattice QCD can provide an answer to this question, but fully dynamical, 4-flavor ensembles do not yet exist. The large charm quark mass also is expected to introduce additional cut-off effects. Nonetheless, as an exploratory study, we recently calculated the second-, fourth- and sixth-order susceptibilities for the charm quark in the partially quenched approximation using the p4 action. We found that our results were in good agreement with perturbative estimates for these quantities. We also studied correlations between charm and the lighter flavors. We compared these quantities to simple quasiparticle and resonance gas models. Lastly, we shall also comment on calculations of the charm's contribution to the pressure within the partially quenched approximation. (author)

  5. $\\phi$ meson self-energy in nuclear matter from $\\phi N$ resonant interactions

    CERN Document Server

    Cabrera, D; Vacas, M J Vicente

    2016-01-01

    The $\\phi$-meson properties in cold nuclear matter are investigated by implementing resonant $\\phi N$ interactions as described in effective approaches including the unitarization of scattering amplitudes. Several $N^*$-like states are dynamically generated in these models around $2$ GeV, in the vicinity of the $\\phi N$ threshold. We find that both these states and the non-resonant part of the amplitude contribute sizably to the $\\phi$ collisional self-energy at finite nuclear density. These contributions are of a similar strength as the widely studied medium effects from the $\\bar K K$ cloud. Depending on model details (position of the resonances and strength of the coupling to $\\phi N$) we report a $\\phi$ broadening up to about $40$-$50$ MeV, to be added to the $\\phi\\to\\bar K K$ in-medium decay width, and an attractive optical potential at threshold up to about $35$ MeV at normal matter density. The $\\phi$ spectral function develops a double peak structure as a consequence of the mixing of resonance-hole mo...

  6. Exotic mesons: status and future

    OpenAIRE

    Klempt, Eberhard

    2007-01-01

    The evidence for the existence of mesons with exotic quantum numbers and of hybrid candidates with non-exotic quantum numbers is critically reviewed, including candidates with hidden charm. Aims and methods of future searches for hybrid mesons are briefly discussed.

  7. Isoscalar $\\pi\\pi$ scattering and the $\\sigma$ meson resonance from QCD

    CERN Document Server

    Briceno, Raul A; Edwards, Robert G; Wilson, David J

    2016-01-01

    We present for the first time a determination of the energy dependence of the isoscalar $\\pi\\pi$ elastic scattering phase-shift within a first-principles numerical lattice approach to QCD. Hadronic correlation functions are computed including all required quark propagation diagrams, and from these the discrete spectrum of states in the finite volume defined by the lattice boundary is extracted. From the volume dependence of the spectrum we obtain the $S$-wave phase-shift up to the $K\\overline{K}$ threshold. Calculations are performed at two values of the $u,d$ quark mass corresponding to $m_\\pi = 236, 391$ MeV and the resulting amplitudes are described in terms of a $\\sigma$ meson which evolves from a bound-state below $\\pi\\pi$ threshold at the heavier quark mass, to a broad resonance at the lighter quark mass.

  8. Suppressed Charmed B Decay

    Energy Technology Data Exchange (ETDEWEB)

    Snoek, Hella Leonie; /Vrije U., Amsterdam

    2011-11-28

    This thesis describes the measurement of the branching fractions of the suppressed charmed B{sup 0} {yields} D{sup (*)-} a{sub 0}{sup +} decays and the non-resonant B{sup 0} {yields} D{sup (*)-} {eta}{pi}{sup +} decays in approximately 230 million {Upsilon}(4S) {yields} B{bar B} events. The data have been collected with the BABAR detector at the PEP-II B factory at the Stanford Linear Accelerator Center in California. Theoretical predictions of the branching fraction of the B{sup 0} {yields} D{sup (*)-} a{sub 0}{sup +} decays show large QCD model dependent uncertainties. Non-factorizing terms, in the naive factorization model, that can be calculated by QCD factorizing models have a large impact on the branching fraction of these decay modes. The predictions of the branching fractions are of the order of 10{sup -6}. The measurement of the branching fraction gives more insight into the theoretical models. In general a better understanding of QCD models will be necessary to conduct weak interaction physics at the next level. The presence of CP violation in electroweak interactions allows the differentiation between matter and antimatter in the laws of physics. In the Standard Model, CP violation is incorporated in the CKM matrix that describes the weak interaction between quarks. Relations amongst the CKM matrix elements are used to present the two relevant parameters as the apex of a triangle (Unitarity Triangle) in a complex plane. The over-constraining of the CKM triangle by experimental measurements is an important test of the Standard Model. At this moment no stringent direct measurements of the CKM angle {gamma}, one of the interior angles of the Unitarity Triangle, are available. The measurement of the angle {gamma} can be performed using the decays of neutral B mesons. The B{sup 0} {yields} D{sup (*)-} a{sub 0}{sup +} decay is sensitive to the angle {gamma} and, in comparison to the current decays that are being employed, could significantly enhance the

  9. Chiral dynamics of heavy-light mesons

    International Nuclear Information System (INIS)

    This thesis focuses on the physics of heavy-light mesons, i.e. quark-antiquark systems composed of a heavy (c or b) and a light (u, d or s) quark. The light-quark sector is treated within the framework of chiral effective field theory. Recent lattice QCD computations have progressed in determining the decay constants of charmed mesons and the scattering lengths of Nambu-Goldstone bosons (pions, kaons) off D mesons. These computations are performed for light quark masses larger than the physical ones. A chiral extrapolation down to physical masses is necessary. It is commonly performed using chiral perturbation theory. The related systematical uncertainties have to be examined carefully. In this thesis it is shown how these uncertainties can be reduced significantly by taking into account relativistic effects in the chiral extrapolations. As a byproduct, estimates are presented for several physical quantities that are related by heavy-quark spin and flavor symmetry. Furthermore, the investigation of the light-quark mass dependence of the scattering lengths of Nambu-Goldstone bosons off D mesons provides important information on the nature of one of the intriguing newly discovered resonances, the D*s0(2317). It is shown that this resonance can be dynamically generated from the coupled-channels DK interaction without a priori assumption of its existence. Finally we demonstrate how the underlying framework, unitarized chiral perturbation theory, can be improved by the inclusion of intermediate states with off-the-mass-shell kinematics.

  10. Search for a light Higgs resonance in radiative decays of the Y(1S) with a charm tag

    Energy Technology Data Exchange (ETDEWEB)

    Lees, J. P. [Univ. de Savoie, Annecy-Le-Vieux (France). et al.

    2015-04-10

    In this study, a search is presented for the decay Υ(1S)→γA0, A0 → cc¯, where A0 is a candidate for the CP-odd Higgs boson of the next-to-minimal supersymmetric standard model. The search is based on data collected with the BABAR detector at the Υ(2S) resonance. A sample of Υ(1S) mesons is selected via the decay Υ(2S) → π+π Υ(1S). The A0 → cc¯ decay is identified through the reconstruction of hadronic D0, D+, and D*(2010)+ meson decays. No significant signal is observed. The measured 90% confidence-level upper limits on the product branching fraction B(Υ(1S) → γA0)×B(A0 → cc¯) range from 7.4×10–5 to 2.4×10–3 for A0 masses from 4.00 to 8.95 GeV/c2 and 9.10 to 9.25 GeV/c2, where the region between 8.95 and 9.10 GeV/c2 is excluded because of background from Υ(2S) → γχbJ(1P), χbJ(1P) → γΥ(1S) decays.

  11. Elliptic flow and nuclear modification factors of D-mesons at FAIR in a Hybrid-Langevin approach

    CERN Document Server

    Lang, Thomas; Steinheimer, Jan; Bleicher, Marcus

    2013-01-01

    The Compressed Baryonic Matter (CBM) experiment at the Facility for Anti-proton and Ion Research (FAIR) will provide new possibilities for charm-quark ($D$-meson) observables in heavy-ion collisions at low collision energies and high baryon densities. To predict the collective flow and nuclear modification factors of charm quarks in this environment, we apply a Langevin approach for the transport of charm quarks in the UrQMD (hydrodynamics + Boltzmann) hybrid model. Due to the inclusion of event-by-event fluctuations and a full (3+1) dimensional hydrodynamical evolution, the UrQMD hybrid approach provides a realistic evolution of the matter produced in heavy-ion collisions. As drag and diffusion coefficients we use a resonance approach for elastic heavy-quark scattering and assume a decoupling temperature of the charm quarks from the hot medium of $130\\, \\MeV$. Hadronization of the charm quarks to $D$-mesons by coalescence is included. Since the initial charm-quark distribution at FAIR is unknown, we utilize ...

  12. Mixing and CP-violation in charm

    OpenAIRE

    Petrov, Alexey A.

    2004-01-01

    The motivation most often cited in searches for D0-anti-D0 mixing and CP-violation in charm system lies with the possibility of observing a signal from new physics which dominates that from the Standard Model. We review recent theoretical predictions and experimental constraints on D0-anti-D0 mixing parameters. We also discuss the current status of searches for CP-violation in charmed meson transitions, as well as some recent theoretical ideas.

  13. Hadrons with charmed quarks in the nuclear medium

    International Nuclear Information System (INIS)

    A survey is given on expected changes of charmonium (J/ψ and ηc) as well as charmed meson (D and D) masses in nuclear matter. The physical implications of such in-medium effects are discussed. (orig.)

  14. Lattice calculation of nonleptonic charm decays

    International Nuclear Information System (INIS)

    The decays of charmed mesons into two body nonleptonic final states are investigated. Weak interaction amplitudes of interest in these decays are extracted from lattice four-point correlation functions using a effective weak Hamiltonian including effects to order Gf in the weak interactions yet containing effects to all orders in the strong interactions. The lattice calculation allows a quantitative examination of non-spectator processes in charm decays helping to elucidate the role of effects such as color coherence, final state interactions and the importance of the so called weak annihilation process. For D → Kπ, we find that the non-spectator weak annihilation diagram is not small, and we interpret this as evidence for large final state interactions. Moreover, there is indications of a resonance in the isospin 1/2 channel to which the weak annihilation process contributes exclusively. Findings from the lattice calculation are compared to results from the continuum vacuum saturation approximation and amplitudes are examined within the framework of the 1/N expansion. Factorization and the vacuum saturation approximation are tested for lattice amplitudes by comparing amplitudes extracted from lattice four-point functions with the same amplitude extracted from products of two-point and three-point lattice correlation functions arising out of factorization and vacuum saturation

  15. CP violation in charm decays at CDF

    International Nuclear Information System (INIS)

    Exploiting the full Run II data sample collected by the CDF trigger on displaced vertices, we present a search for CP violation in neutral D mesons decays to hadronic final states. We use the strong D∗+ → D0π+ (and c.c.) decay to identify the flavor of the charmed meson at production time and exploit CP conserving strong c¯c pair-production in p¯p collisions. The results are the world’s most precise measurements to date and confirm the presence of sizable CP-violating effects in the charm sector as recently observed by the LHCb collaboration.

  16. Charm and beauty decays in the ALEPH experiment

    International Nuclear Information System (INIS)

    Results of the ALEPH experiment at LEP are presented on charm and beauty decays, from data taken in 1990 and 1991. Several exclusive channels of charm and beauty mesons are seen. Evidence is given for the production of beauty baryons from correlations between a high Pt lepton and a Λ0 or a Λc baryon. Finally, first evidence is given for the production of the strange B meson, from Ds-lepton correlations. (author) 7 refs., 7 figs

  17. Proceedings of the tau-charm factory workshop

    International Nuclear Information System (INIS)

    This report contains papers on the following main topics: machine physics; tau physics; D and Ds physics; J/Ψ and charmonium physics; tau charm factories; workshop summary; accelerator physics; tau physics; charmed meson physics; J/Ψ and charmonium physics; and detector

  18. On the Partial-Wave Analysis of Mesonic Resonances Decaying to Multiparticle Final States Produced by Polarized Photons

    CERN Document Server

    Salgado, Carlos W

    2013-01-01

    Meson spectroscopy is going through a revival with the advent of high statistics experiments and new advances in the theoretical predictions. The Constituent Quark Model (CQM) is finally being expanded considering more basic principles of field theory and using discrete calculations of Quantum Chromodynamics (lattice QCD). These new calculations are approaching predictive power for the spectrum of hadronic resonances and decay modes. It will be the task of the new experiments to extract the meson spectrum from the data and compare with those predictions. The goal of this report is to describe one particular technique for extracting resonance information from multiparticle final states. The technique described here, partial wave analysis based on the helicity formalism, has been used at Brookhaven National Laboratory (BNL) using pion beams, and Jefferson Laboratory (JLab) using photon beams. In particular this report broaden this technique to include production experiments using linearly polarized real photons...

  19. Hidden-charm pentaquarks as a meson-baryon molecule with coupled channels for $\\bar{D}^{(\\ast)}\\Lambda_{\\rm c}$ and $\\bar{D}^{(\\ast)}\\Sigma^{(\\ast)}_{\\rm c}$

    CERN Document Server

    Yamaguchi, Yasuhiro

    2016-01-01

    The recent observation of two hidden-charm pentaquark states by LHCb collaborations inspires us to investigate the exotic states close to the $\\bar{D}^{(\\ast)}\\Sigma^{(\\ast)}_{\\rm c}$ thresholds. We study the hadronic molecules being realized as the coupled channel system of $\\bar{D}^{(\\ast)}\\Lambda_{\\rm c}$ and $\\bar{D}^{(\\ast)}\\Sigma^{(\\ast)}_{\\rm c}$. The heavy quark spin symmetry manifests the mass degeneracies of $\\bar{D}$ and $\\bar{D}^\\ast$ mesons, and of $\\Sigma_{\\rm c}$ and $\\Sigma^\\ast_{\\rm c}$ baryons. Hence the coupled channels of $\\bar{D}^{(\\ast)}\\Sigma^{(\\ast)}_{\\rm c}$ are important in the molecules. In addition, we consider the coupling to the $\\bar{D}^{(\\ast)}\\Lambda_{\\rm c}$ channel whose thresholds are near the $\\bar{D}^{(\\ast)}\\Sigma^{(\\ast)}_{\\rm c}$ thresholds, and the coupling to the state with larger orbital angular momentum mixed by the tensor force. This full coupled channel analysis of $\\bar{D}^{(\\ast)}\\Lambda_{\\rm c}-\\bar{D}^{(\\ast)}\\Sigma^{(\\ast)}_{\\rm c}$ with larger orbital angul...

  20. Compositeness of the strange, charm and beauty odd parity $\\Lambda$ states

    CERN Document Server

    Garcia-Recio, C; Nieves, J; Salcedo, L L; Tolos, L

    2015-01-01

    We study the dependence on the quark mass of the compositeness of the lowest-lying odd parity hyperon states. Thus, we pay attention to $\\Lambda-$like states in the strange, charm and beauty, sectors which are dynamically generated using a unitarized meson-baryon model. In the strange sector we use an SU(6) extension of the Weinberg-Tomozawa meson-baryon interaction, and we further implement the heavy-quark spin symmetry to construct the meson-baryon interaction when charmed or beauty hadrons are involved. In the three examined flavor sectors, we obtain two $J^P=1/2^-$ and one $J^P=3/2^-$ $\\Lambda$ states. We find that the $\\Lambda$ states which are bound states (the three $\\Lambda_b$) or narrow resonances (one $\\Lambda(1405)$ and one $\\Lambda_c(2595)$) are well described as molecular states composed of $s$-wave meson-baryon pairs. The $\\frac{1}{2}^-$ wide $\\Lambda(1405)$ and $\\Lambda_c(2595)$ as well as the $\\frac{3}{2}^-$ $\\Lambda(1520)$ and $\\Lambda_c(2625)$ states display smaller compositeness and so they...

  1. Compositeness of the strange, charm, and beauty odd parity Λ states

    Science.gov (United States)

    Garcia-Recio, C.; Hidalgo-Duque, C.; Nieves, J.; Salcedo, L. L.; Tolos, L.

    2015-08-01

    We study the dependence on the quark mass of the compositeness of the lowest-lying odd parity hyperon states. Thus, we pay attention to Λ -like states in the strange, charm, and beauty sectors which are dynamically generated using a unitarized meson-baryon model. In the strange sector we use a SU(6) extension of the Weinberg-Tomozawa meson-baryon interaction, and we further implement the heavy-quark spin symmetry to construct the meson-baryon interaction when charmed or beauty hadrons are involved. In the three examined flavor sectors, we obtain two JP=1 /2- and one JP=3 /2- Λ states. We find that the Λ states which are bound states (the three Λb) or narrow resonances [one Λ (1405 ) and one Λc(2595 )] are well described as molecular states composed of s -wave meson-baryon pairs. The 1/2- wide Λ (1405 ) and Λc(2595 ) as well as the 3/2- Λ (1520 ) and Λc(2625 ) states display smaller compositeness so they would require new mechanisms, such as d -wave interactions.

  2. Measurement of Resonance Parameters of Orbitally Excited Narrow B^0 Mesons

    Energy Technology Data Exchange (ETDEWEB)

    Aaltonen, : T.

    2008-09-01

    The authors report a measurement of resonance parameters of the orbitally excited (L = 1) narrow B{sup 0} mesons in decays to B{sup (*)+}{pi}{sup -} using 1.7 fb{sup -1} of data collected by the CDF II detector at the Fermilab Tevatron. The mass and width of the B*{sub 2}{sup 0} state are measured to be m(B*{sub 2}{sup 0}) = 5740.2{sub -1.8}{sup +1.7}(stat.){sub -0.8}{sup +0.9}(syst.) MeV/c{sup 2} and {Lambda}(B*{sub 2}{sup 0}) = 22.7{sub -3.2}{sup +3.8}(stat.){sub -10.2}{sup +3.2}(syst.) MeV/c{sub 2}. The mass difference between the B*{sub 2}{sup 0} and B{sub 1}{sup 0} states is measured to be 14.9{sub -2.5}{sup +2.2}(stat.){sub -1.4}{sup +1.2}(syst.) MeV/c{sup 2}, resulting in a B{sub 1}{sup 0} mass of 5725.3{sub -2.2}{sup +1.6}(stat.){sub -1.5}{sup +1.4}(syst.) MeV/c{sup 2}. This is currently the most precise measurement of the masses of these states and the first measurement of the B*{sub 2}{sup 0} width.

  3. Measurement of resonance parameters of orbitally excited narrow B0 mesons.

    Science.gov (United States)

    Aaltonen, T; Adelman, J; Akimoto, T; Albrow, M G; González, B Alvarez; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Apollinari, G; Apresyan, A; Arisawa, T; Artikov, A; Ashmanskas, W; Attal, A; Aurisano, A; Azfar, F; Azzurri, P; Badgett, W; Barbaro-Galtieri, A; Barnes, V E; Barnett, B A; Bartsch, V; Bauer, G; Beauchemin, P-H; Bedeschi, F; Beecher, D; Behari, S; Bellettini, G; Bellinger, J; Benjamin, D; Beretvas, A; Beringer, J; Bhatti, A; Binkley, M; Bisello, D; Bizjak, I; Blair, R E; Blocker, C; Blumenfeld, B; Bocci, A; Bodek, A; Boisvert, V; Bolla, G; Bortoletto, D; Boudreau, J; Boveia, A; Brau, B; Bridgeman, A; Brigliadori, L; Bromberg, C; Brubaker, E; Budagov, J; Budd, H S; Budd, S; Burke, S; Burkett, K; Busetto, G; Bussey, P; Buzatu, A; Byrum, K L; Cabrera, S; Calancha, C; Campanelli, M; Campbell, M; Canelli, F; Canepa, A; Carls, B; Carlsmith, D; Carosi, R; Carrillo, S; Carron, S; Casal, B; Casarsa, M; Castro, A; Catastini, P; Cauz, D; Cavaliere, V; Cavalli-Sforza, M; Cerri, A; Cerrito, L; Chang, S H; Chen, Y C; Chertok, M; Chiarelli, G; Chlachidze, G; Chlebana, F; Cho, K; Chokheli, D; Chou, J P; Choudalakis, G; Chuang, S H; Chung, K; Chung, W H; Chung, Y S; Chwalek, T; Ciobanu, C I; Ciocci, M A; Clark, A; Clark, D; Compostella, G; Convery, M E; Conway, J; Cordelli, M; Cortiana, G; Cox, C A; Cox, D J; Crescioli, F; Almenar, C Cuenca; Cuevas, J; Culbertson, R; Cully, J C; Dagenhart, D; Datta, M; Davies, T; de Barbaro, P; De Cecco, S; Deisher, A; De Lorenzo, G; Dell'orso, M; Deluca, C; Demortier, L; Deng, J; Deninno, M; Derwent, P F; di Giovanni, G P; Dionisi, C; Di Ruzza, B; Dittmann, J R; D'Onofrio, M; Donati, S; Dong, P; Donini, J; Dorigo, T; Dube, S; Efron, J; Elagin, A; Erbacher, R; Errede, D; Errede, S; Eusebi, R; Fang, H C; Farrington, S; Fedorko, W T; Feild, R G; Feindt, M; Fernandez, J P; Ferrazza, C; Field, R; Flanagan, G; Forrest, R; Frank, M J; Franklin, M; Freeman, J C; Furic, I; Gallinaro, M; Galyardt, J; Garberson, F; Garcia, J E; Garfinkel, A F; Genser, K; Gerberich, H; Gerdes, D; Gessler, A; Giagu, S; Giakoumopoulou, V; Giannetti, P; Gibson, K; Gimmell, J L; Ginsburg, C M; Giokaris, N; Giordani, M; Giromini, P; Giunta, M; Giurgiu, G; Glagolev, V; Glenzinski, D; Gold, M; Goldschmidt, N; Golossanov, A; Gomez, G; Gomez-Ceballos, G; Goncharov, M; González, O; Gorelov, I; Goshaw, A T; Goulianos, K; Gresele, A; Grinstein, S; Grosso-Pilcher, C; Grundler, U; da Costa, J Guimaraes; Gunay-Unalan, Z; Haber, C; Hahn, K; Hahn, S R; Halkiadakis, E; Han, B-Y; Han, J Y; Happacher, F; Hara, K; Hare, D; Hare, M; Harper, S; Harr, R F; Harris, R M; Hartz, M; Hatakeyama, K; Hays, C; Heck, M; Heijboer, A; Heinrich, J; Henderson, C; Herndon, M; Heuser, J; Hewamanage, S; Hidas, D; Hill, C S; Hirschbuehl, D; Hocker, A; Hou, S; Houlden, M; Hsu, S-C; Huffman, B T; Hughes, R E; Husemann, U; Huston, J; Incandela, J; Introzzi, G; Iori, M; Ivanov, A; James, E; Jayatilaka, B; Jeon, E J; Jha, M K; Jindariani, S; Johnson, W; Jones, M; Joo, K K; Jun, S Y; Jung, J E; Junk, T R; Kamon, T; Kar, D; Karchin, P E; Kato, Y; Kephart, R; Keung, J; Khotilovich, V; Kilminster, B; Kim, D H; Kim, H S; Kim, H W; Kim, J E; Kim, M J; Kim, S B; Kim, S H; Kim, Y K; Kimura, N; Kirsch, L; Klimenko, S; Knuteson, B; Ko, B R; Kondo, K; Kong, D J; Konigsberg, J; Korytov, A; Kotwal, A V; Kreps, M; Kroll, J; Krop, D; Krumnack, N; Kruse, M; Krutelyov, V; Kubo, T; Kuhr, T; Kulkarni, N P; Kurata, M; Kusakabe, Y; Kwang, S; Laasanen, A T; Lami, S; Lammel, S; Lancaster, M; Lander, R L; Lannon, K; Lath, A; Latino, G; Lazzizzera, I; Lecompte, T; Lee, E; Lee, H S; Lee, S W; Leone, S; Lewis, J D; Lin, C-S; Linacre, J; Lindgren, M; Lipeles, E; Lister, A; Litvintsev, D O; Liu, C; Liu, T; Lockyer, N S; Loginov, A; Loreti, M; Lovas, L; Lucchesi, D; Luci, C; Lueck, J; Lujan, P; Lukens, P; Lungu, G; Lyons, L; Lys, J; Lysak, R; Macqueen, D; Madrak, R; Maeshima, K; Makhoul, K; Maki, T; Maksimovic, P; Malde, S; Malik, S; Manca, G; Manousakis-Katsikakis, A; Margaroli, F; Marino, C; Marino, C P; Martin, A; Martin, V; Martínez, M; Martínez-Ballarín, R; Maruyama, T; Mastrandrea, P; Masubuchi, T; Mathis, M; Mattson, M E; Mazzanti, P; McFarland, K S; McIntyre, P; McNulty, R; Mehta, A; Mehtala, P; Menzione, A; Merkel, P; Mesropian, C; Miao, T; Miladinovic, N; Miller, R; Mills, C; Milnik, M; Mitra, A; Mitselmakher, G; Miyake, H; Moggi, N; Moon, C S; Moore, R; Morello, M J; Morlok, J; Fernandez, P Movilla; Mülmenstädt, J; Mukherjee, A; Muller, Th; Mumford, R; Murat, P; Mussini, M; Nachtman, J; Nagai, Y; Nagano, A; Naganoma, J; Nakamura, K; Nakano, I; Napier, A; Necula, V; Nett, J; Neu, C; Neubauer, M S; Neubauer, S; Nielsen, J; Nodulman, L; Norman, M; Norniella, O; Nurse, E; Oakes, L; Oh, S H; Oh, Y D; Oksuzian, I; Okusawa, T; Orava, R; Griso, S Pagan; Palencia, E; Papadimitriou, V; Papaikonomou, A; Paramonov, A A; Parks, B; Pashapour, S; Patrick, J

    2009-03-13

    We report a measurement of resonance parameters of the orbitally excited (L=1) narrow B0 mesons in decays to B;{(*)+}pi;{-} using 1.7 fb;{-1} of data collected by the CDF II detector at the Fermilab Tevatron. The mass and width of the B_{2};{*0} state are measured to be m(B_{2};{*0})=5740.2_{-1.8};{+1.7}(stat)-0.8+0.9(syst) MeV/c;{2} and Gamma(B_{2};{*0})=22.7_{-3.2};{+3.8}(stat)-10.2+3.2(syst) MeV/c;{2}. The mass difference between the B_{2};{*0} and B10 states is measured to be 14.9_{-2.5};{+2.2}(stat)-1.4+1.2(syst) MeV/c;{2}, resulting in a B10 mass of 5725.3_{-2.2};{+1.6}(stat)-1.5+1.4(syst) MeV/c;{2}. This is currently the most precise measurement of the masses of these states and the first measurement of the B_{2};{*0} width. PMID:19392106

  4. Bc mesons in the deconfined phase

    Directory of Open Access Journals (Sweden)

    Czerski Piotr

    2014-01-01

    Full Text Available Charmed B mesons in a deconfined quark-gluon plasma are studied. With the introduction of the bound state of a charm and a beauty quarks at finite temperature, the behavior of the heavy quarkonium is investigated in an energy region between the ψ and the ϒ states [1]. Calculations are performed within a potential model [2, 3].

  5. Resonances in QCD

    Science.gov (United States)

    Lutz, Matthias F. M.; Lange, Jens Sören; Pennington, Michael; Bettoni, Diego; Brambilla, Nora; Crede, Volker; Eidelman, Simon; Gillitzer, Albrecht; Gradl, Wolfgang; Lang, Christian B.; Metag, Volker; Nakano, Takashi; Nieves, Juan; Neubert, Sebastian; Oka, Makoto; Olsen, Stephen L.; Pappagallo, Marco; Paul, Stephan; Pelizäus, Marc; Pilloni, Alessandro; Prencipe, Elisabetta; Ritman, Jim; Ryan, Sinead; Thoma, Ulrike; Uwer, Ulrich; Weise, Wolfram

    2016-04-01

    We report on the EMMI Rapid Reaction Task Force meeting 'Resonances in QCD', which took place at GSI October 12-14, 2015. A group of 26 people met to discuss the physics of resonances in QCD. The aim of the meeting was defined by the following three key questions: What is needed to understand the physics of resonances in QCD? Where does QCD lead us to expect resonances with exotic quantum numbers? What experimental efforts are required to arrive at a coherent picture? For light mesons and baryons only those with up, down and strange quark content were considered. For heavy-light and heavy-heavy meson systems, those with charm quarks were the focus. This document summarizes the discussions by the participants, which in turn led to the coherent conclusions we present here.

  6. Resonances in QCD

    Energy Technology Data Exchange (ETDEWEB)

    Lutz, Matthias F. M.; Lange, Jens Sören; Pennington, Michael; Bettoni, Diego; Brambilla, Nora; Crede, Volker; Eidelman, Simon; Gillitzer, Albrecht; Gradl, Wolfgang; Lang, Christian B.; Metag, Volker; Nakano, Takashi; Nieves, Juan; Neubert, Sebastian; Oka, Makoto; Olsen, Stephen L.; Pappagallo, Marco; Paul, Stephan; Pelizäus, Marc; Pilloni, Alessandro; Prencipe, Elisabetta; Ritman, Jim; Ryan, Sinead; Thoma, Ulrike; Uwer, Ulrich; Weise, Wolfram

    2016-04-01

    We report on the EMMI Rapid Reaction Task Force meeting 'Resonances in QCD', which took place at GSI October 12-14, 2015 (Fig.~1). A group of 26 people met to discuss the physics of resonances in QCD. The aim of the meeting was defined by the following three key questions; what is needed to understand the physics of resonances in QCD?; where does QCD lead us to expect resonances with exotic quantum numbers?; and what experimental efforts are required to arrive at a coherent picture? For light mesons and baryons only those with up, down and strange quark content were considered. For heavy-light and heavy-heavy meson systems, those with charm quarks were the focus.This document summarizes the discussions by the participants, which in turn led to the coherent conclusions we present here.

  7. Resonances in QCD

    CERN Document Server

    Lutz, Matthias F M; Pennington, Michael; Bettoni, Diego; Brambilla, Nora; Crede, Volker; Eidelman, Simon; Gillitzer, Albrecht; Gradl, Wolfgang; Lang, Christian B; Metag, Volker; Nieves, Juan; Neubert, Sebastian; Oka, Makoto; Olsen, Steve L; Pappagallo, Marco; Paul, Stephan; Pelizäus, Marc; Pilloni, Alessandro; Prencipe, Elisabetta; Ritman, Jim; Ryan, Sinead; Thoma, Ulrike; Uwer, Ulrich; Weise, Wolfram

    2015-01-01

    We report on the EMMI Rapid Reaction Task Force meeting 'Resonances in QCD', which took place at GSI October 12-14, 2015. A group of 26 people met to discuss the physics of resonances in QCD. The aim of the meeting was defined by the following three key questions: What is needed to understand the physics of resonances in QCD? Where does QCD lead us to expect resonances with exotic quantum numbers? What experimental efforts are required to arrive at a coherent picture? For light mesons and baryons only those with ${\\it up}$, ${\\it down}$ and ${\\it strange}$ quark content were considered. For heavy-light and heavy-heavy meson systems, those with ${\\it charm}$ quarks were the focus. This document summarizes the discussions by the participants, which in turn led to the coherent conclusions we present here.

  8. Many-Body Coulomb Gauge Exotic and Charmed Hybrids

    CERN Document Server

    Llanes-Estrada, F J; Llanes-Estrada, Felipe J.; Cotanch, Stephen R.

    2001-01-01

    Utilizing a QCD Coulomb gauge Hamiltonian with linear confinement specified by lattice, we report a relativistic many-body calculation for the light exotic and charmed hybrid mesons. The Hamiltonian successfully describes both quark and gluon sectors, with vacuum and quasiparticle properties generated by a BCS transformation and more elaborate TDA and RPA diagonalizations for the meson ($q\\bar{q}$) and glueball ($gg$) masses. Hybrids entail a computationally intense relativistic three quasiparticle ($q\\bar{q}g$) calculation with the 9 dimensional Hamiltonian matrix elements evaluated variationally by Monte Carlo techniques. Our new TDA spectrum for the nonexotic $1^{--}$ charmed ($c\\bar{c}$ and $c\\bar{c}g$) system provides an explanation for the overpopulation of the observed $J/\\psi$ states. For the important $1^{-+}$ light exotic channel we obtain hybrid masses above 2 $GeV$, in broad agreement with lattice and flux tube models, indicating that the recently observed resonances at 1.4 and 1.6 $GeV$ are of di...

  9. Hadronic Decays of Charm

    OpenAIRE

    Stenson, Kevin

    2001-01-01

    Recent hadronic charm decay results from fixed-target experiments are presented. New measurements of the D0 to K-K+K-pi+ branching ratio are shown as are recent results from Dalitz plot fits to D+ to K-K+pi+, pi+pi-pi+, K-pi+pi+, K+pi-pi+ and D_s+ to pi+pi-pi+, K+pi-pi+. These fits include measurements of the masses and widths of several light resonances as well as strong evidence for the existence of two light scalar particles, the pipi resonance sigma and the Kpi resonance kappa.

  10. Charm production physics from Fermilab fixed-target experiments

    International Nuclear Information System (INIS)

    Recent analyses of charm quark production mechanisms from Fermilab fixed-target experiments are summarized. Measurements of single inclusive differential cross sections for hadroproduced and photoproduced D mesons are compared to next-to-leading order QCD calculations. New data from hadroproduction and previous photoproduction measurements of charm meson pair correlations are compared to NLO calculations and also to parton shower Monte Carlo models. Nonperturbative effects, such as intrinsic kt and fragmentation, are seen to play an important role in most of these comparisons. Results on charm production asymmetries in both hadroproduction and photoproduction are summarized

  11. Production of charm in the quark-gluon strings model

    International Nuclear Information System (INIS)

    The quark-gluon strings model based on the 1/Nf - expansion in QCD is applied to the production of the charmed particles D(D-bar)-mesons and Λc+-hyperons. It is demonstrated that the model describes quantitatively the basic characteristics of the inclusive charm production generation. Experimental data indicate to the nonlinearity of the Ψ-mesons Regge trajectory with a close to zero intercept (αΨ(0) ∼ 0). The model predictions for the inclusive spectra of the charmed particles are given in a wide energy range

  12. The ARGUS experiment: Beauty (and charm) at DESY

    International Nuclear Information System (INIS)

    The ARGUS detector is described and results of some early measurements are given, including the mass of the Y meson, and the shape of the ππ mass spectrum in the decay Y -- ππY. Studies of the production and decay of charmed mesons from the continuum are described in detail

  13. Spectroscopy and decays of charm and bottom

    International Nuclear Information System (INIS)

    After a brief review of the quark model, we discuss our present knowledge of the spectroscopy of charm and bottom mesons and baryons. We go on to review the lifetimes, semileptonic, and purely leptonic decays of these particles. We conclude with a brief discussion B and D mixing and rare decays

  14. Role of the hidden charm $N^*_{c\\bar{c}}(4261)$ resonance in the $\\pi^- p \\to J/\\psi n$ reaction

    CERN Document Server

    Ouyang, Zhen

    2015-01-01

    We employ an effective Lagrangian approach and isobar model to investigate the role of the $N^*_{c\\bar{c}}(4261)$ resonance with hidden charm in the $\\pi^- p \\to J/\\psi n$ reaction. The total and differential cross sections of this reaction are predicted by including contributions from both $N^*_{c\\bar{c}}(4261)$ and nucleon pole. It is found that the maximal value of the total cross section can exceed 11 $\\mu b$ and a clear $N^*_{c\\bar{c}}(4261)$ peak is visible there, well distinguished from background. As center-of-mass energy increases to about 4.8 GeV, the background makes the differential cross section for backward angles rather different. Our theoretical results would provide valuable information for looking for the $N^*_{c\\bar{c}}(4261)$ resonance in future experiments.

  15. Coupled-channel study of crypto-exotic baryons with charm

    CERN Document Server

    Hofmann, J

    2005-01-01

    Identifying the t-channel exchange of vector mesons as the driving force for the s-wave scattering of pseudo-scalar mesons off the baryon ground states, a surprisingly rich spectrum of molecules is formed. We argue that chiral symmetry and large- N_c considerations determine that part of the interaction which generates the spectrum. All channels that are required by the existence of (u,d,s,c) quarks are considered. A bound state with exotic quantum numbers is predicted at mass 2.78 GeV. It couples strongly to the (bar D_s N),(bar D Lambda),(bar D Sigma) channels. A further charm minus-one system is predicted at mass 2.84 GeV as a result of (bar D_s Lambda), (bar D Xi) interactions. We suggest the existence of strongly bound crypto-exotic baryons, which contain a charm-anti-charm pair. Such states are narrow since they can decay only via OZI-violating processes. A narrow nucleon resonance is found at mass 3.52 GeV. It is a coupled-channel bound state of the (eta_c N), (bar D Sigma_c) system, which decays domin...

  16. Development of fast and radiation hard Monolithic Active Pixel Sensors (MAPS) optimized for open charm meson detection with the CBM experiment

    International Nuclear Information System (INIS)

    The adequacy of CMOS MAPS (Monolithic Active Pixel Sensors) to provide high spatial resolution while submitted to high particle flux and radiation level is assessed in this work. A 55Fe-source and minimum ionizing particle beams were used to study the performances of MAPS being irradiated either with neutrons and X-rays. As expected, ionizing radiation dominantly causes an increase of the leakage current of the pixels, which translates into increased shot noise. Non-ionizing radiation generates increases in terms of leakage currents but can reduce substantially the lifetime of the signal electrons in the pixel. The latter was found to cause a dramatic drop of the signal if the lifetime of the electrons shrinks below the time required for charge collection. The performances of irradiated detectors were studied as a function of the operation conditions, i.e. in terms of temperature and integration time of the pixel. It was demonstrated that running the detectors at low temperature (7 collisions per second, would shrink the lifetime of the detector to a few days. It was however demonstrated that a balanced configuration exists where, for lower beam interaction rate, enough D0-mesons can be collected and analyzed to investigate their production properties with a satisfactory sensitivity. (A.C.)

  17. Study of Branching Ratio And Polarization Fraction in Neutral B Meson Decays to Negative Rho Meson Positive Kaon Resonance

    Energy Technology Data Exchange (ETDEWEB)

    Cheng, Baosen; /Wisconsin U., Madison

    2006-03-07

    We present the preliminary results on the search for B{sup 0} {yields} {rho}{sup -}K*{sup +}. The data sample comprises 122.7 million B{bar B} pairs in the e{sup +}e{sup -} annihilation through the {Upsilon}(4S) resonance collected during 1999-2003 with the BABAR detector at the PEP-II asymmetric-energy collider at Stanford Linear Accelerator Center (SLAC). We obtain an upper limit of the branching ratio at 90% confidence level as {Beta}(B{sup 0} {yields} {rho}{sup -}K*{sup +}) < 17.2 x 10{sup -6}. The fitted result on the polarization fraction shows no evidence that the decay is longitudinally dominated as predicted by various theoretical models.

  18. Inclusive photoproduction of charmed hadrons in VMD

    International Nuclear Information System (INIS)

    Photoproduction of charmed hadrons, produced from ''hadronization'' of c- and anti c quarks with low invariant mass have been described in the framework of vector meson dominance model (VMD). In the framework of this mechanism total cross sections and inclusive spectra for charmed hadrons in γN-interactions are calculated. Theoretical values of total cross section σ(anti D) are higher than σ(D) which is connected with pair production of anti D and D mesons. The cross section for such a pair production decreases with energy growth as 1/√S and the yields of anti D and D-mesons (as well as lambdasub(c) and anti lambdasub(c) baryons) are being compared within the limits of high energies

  19. Nuclear dependence of charm production

    Energy Technology Data Exchange (ETDEWEB)

    Blanco-Covarrubias, A.; Engelfried, J.; Amaro-Reyes, J.; Estrada, N.; Flores-Castillo, A.; Lopez-Hinojosa, G.; Morelos, A.; Sanchez-Lopez, J.L.; Torres, I.; Vazquez-Jauregui, E. [Univ. Autonoma de San Luis Potosi, Inst. de Fisica, San Luis Potosi (Mexico); Akgun, U.; Ayan, A.S.; Kaya, M.; McCliment, E.; Newsom, C.; Onel, Y.; Ozkorucuklu, S. [Univ. of Iowa, Iowa City, IA (United States); Alkhazov, G.; Atamantchouk, A.G.; Bondar, N.F.; Golovtsov, V.L.; Kim, V.T.; Kochenda, L.M.; Krivshich, A.G.; Maleev, V.P.; Neoustroev, P.V.; Razmyslovich, B.V.; Stepanov, V.; Svoiski, M.; Uvarov, L.N.; Vorobyov, A.A. [Petersburg Nuclear Physics Inst., St. Petersburg (Russian Federation); Balatz, M.Y.; Davidenko, G.V.; Dolgolenko, A.G.; Dzyubenko, G.B.; Evdokimov, A.V.; Kubantsev, M.A.; Larin, I.; Matveev, V.; Nilov, A.P.; Prutskoi, V.A.; Sitnikov, A.I.; Verebryusov, V.S.; Vishnyakov, V.E. [Inst. of Theoretical and Experimental Physics, Moscow (Russian Federation); Cooper, P.S.; Kilmer, J.; Lach, J.; Stutte, L. [Fermi National Accelerator Lab., Batavia, IL (United States); Dauwe, L.J. [Univ. of Michigan-Flint, Flint, MI (United States); Dersch, U.; Eschrich, I.; Konorov, I.; Krueger, H.; Simon, J.; Vorwalter, K. [Max-Planck-Inst. fuer Kernphysik, Heidelberg (Germany); Edelstein, R.; Jun, S.Y.; Mao, D.; Mathew, P.; Mattson, M.; Procario, M.; Russ, J. [Carnegie-Mellon Univ., Pittsburgh, PA (United States); Emediato, L.; Escobar, C.O.; Gouffon, P.; Lungov, T.; Srivastava, M.; Zukanovich-Funchal, R. [Univ. of Sao Paulo, Sao Paulo (Brazil); Endler, A.M.F. [Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro (Brazil); Filimonov, I.S.; Leikin, E.M.; Nemitkin, A.V.; Rud, V.I. [Moscow State Univ., Moscow (Russian Federation); Garcia, F.G. [Fermi National Accelerator Lab., Batavia, IL (United States); Univ. of Sao Paulo, Sao Paulo (Brazil); Guelmez, E. [Bogazici Univ., Bebek, Istanbul (Turkey); Iori, M. [Univ. of Rome La Sapienza (Italy); INFN, Rome (Italy)] [and others

    2009-12-15

    Using data taken by SELEX during the 1996-1997 fixed target run at Fermilab, we study the production of charmed hadrons on copper and carbon targets with {sigma}{sup -}, p, {pi}{sup -}, and {pi}{sup +} beams. Parametrizing the dependence of the inclusive production cross section on the atomic number A as A{sup {alpha}}, we determine {alpha} for D{sup +}, D{sup 0}, D{sub s}{sup +}, D{sup +}(2010), {lambda}{sub c}{sup +}, and their respective anti-particles, as a function of their transverse momentum p{sub t} and scaled longitudinal momentum x{sub F}. Within our statistics there is no dependence of {alpha} on x{sub F} for any charm species for the interval 0.1 charm production by pion beams is {alpha}{sub meson}=0.850{+-}0.028. This is somewhat larger than the corresponding average {alpha}{sub baryon}=0.755{+-}0.016 for charm production by baryon beams ({sigma}{sup -}, p). (orig.)

  20. Charmed Exotics

    CERN Document Server

    Bali, G; Eidelman, S I; Hanhart, C; Krewald, S; Meißner, U -G; Sibirtsev, A; Wiedner, U

    2009-01-01

    These are the mini-proceedings of the CHARMEX workshop. The meeting focused on recent developments in charm spectroscopy, especially on the possible role of the states that do not fit into the quark model classification, the so-called exotic states. The goal of this write-up is to provide the community with a short summary of the individual talks as well as a comprehensive, up-to-date list of relevant references.

  1. Charming surprise

    CERN Multimedia

    Antonella Del Rosso

    2011-01-01

    The CP violation in charm quarks has always been thought to be extremely small. So, looking at particle decays involving matter and antimatter, the LHCb experiment has recently been surprised to observe that things might be different. Theorists are on the case.   The study of the physics of the charm quark was not in the initial plans of the LHCb experiment, whose letter “b” stands for “beauty quark”. However, already one year ago, the Collaboration decided to look into a wider spectrum of processes that involve charm quarks among other things. The LHCb trigger allows a lot of these processes to be selected, and, among them, one has recently shown interesting features. Other experiments at b-factories have already performed the same measurement but this is the first time that it has been possible to achieve such high precision, thanks to the huge amount of data provided by the very high luminosity of the LHC. “We have observed the decay modes of t...

  2. Charming surprise

    CERN Multimedia

    Antonella Del Rosso

    2011-01-01

    The CP violation in charm quarks has always been thought to be extremely small. So, looking at particle decays involving matter and antimatter, the LHCb experiment has recently been surprised to observe that things might be different. Theorists are on the case. The study of the physics of the charm quark was not in the initial plans of the LHCb experiment, whose letter “b” stands for “beauty quark”. However, already one year ago, the Collaboration decided to look into a wider spectrum of processes that involve charm quarks among other things. The LHCb trigger allows a lot of these processes to be selected, and, among them, one has recently shown interesting features. Other experiments at b-factories have already performed the same measurement but this is the first time that it has been possible to achieve such high precision, thanks to the huge amount of data provided by the very high luminosity of the LHC. “We have observed the decay modes of the D0, a pa...

  3. Two charmoniumlike charged axial resonances near 3885 MeV

    CERN Document Server

    Voloshin, M B

    2016-01-01

    It is argued that the charged $Z^+_c(3885)$ resonance, treated as a `molecular' state of charmed $D$ and $D^*$ mesons, is likely to consist of two peaks unequally coupled to the $D^{*+} \\bar D^0$ and $D^+ \\bar D^{*0}$ channels. The peaks should be split in mass by at least approximately 1.5 MeV. This behavior arises from an enhancement of the effect of isospin violation in the masses of the $D$ and $D^*$ mesons due to apparent suppression of forces between the mesons depending on the spins of the heavy as well as of the light quarks. The suggested double-peak structure can be studied either by direct shape measurement in the channels with heavy mesons, or by isospin-violating transitions from $Z_c^\\pm(3885)$ to the states of charmonium plus a light meson.

  4. Study of leading strange meson resonances and spin-orbit splittings in K-p → K-π+n at 11 GeV/c

    International Nuclear Information System (INIS)

    The results from a high-statistics study of Kπ elastic scattering in the reaction K-p → K-π+n are presented. The data for this analysis are taken from an 11-GeV/c K-p experiment performed on the Large Aperture Solenoidal Spectrometer (LASS) facility at the Stanford Linear Accelerator Center (SLAC). By selecting the very forward produced K-π+ events, a sample consisting of data for the Kπ → Kπ elastic scattering reaction was extracted. The angular distribution for this meson-meson scattering is studied by use of both a spherical harmonic moments analysis and a partial-wave analysis (PWA). The previously established leading natural spin-parity strange meson resonances (the J/sup P/ = 1- K*(895), the 2+ K*(1430), and the 3- K*(1780)) are observed in the results from both the moments analysis and the PWA. In addition, evidence for a new spin 4- K* resonance with a mass of 2080 MeV and a width of about 225 MeV is presented. The results from the PWA confirm the existence of a 0+ kappa (1490) and propose the existence of a second scalar meson resonance, the 0+ kappa' (1900). Structure in the P-wave amplitude indicates resonance behavior in the mass region near 1700 MeV. In two of the four ambiguous solutions for the mass region above 1800 MeV, there is strong evidence for another P-wave resonant structure near 2100 MeV. The observed strange meson resonances are found to have a natural interpretation in terms of states predicted by the quark model. In particular, the mass splittings of the leading trajectory natural spin-parity strange meson states and the mass splittings between the spin-orbit triplet states are discussed. 59 figures, 17 tables

  5. Study of leading strange meson resonances and spin-orbit splittings in K/sup -/p. -->. K/sup -/. pi. /sup +/n at 11 GeV/c

    Energy Technology Data Exchange (ETDEWEB)

    Honma, A.K.

    1980-11-01

    The results from a high-statistics study of K..pi.. elastic scattering in the reaction K/sup -/p ..-->.. K/sup -/..pi../sup +/n are presented. The data for this analysis are taken from an 11-GeV/c K/sup -/p experiment performed on the Large Aperture Solenoidal Spectrometer (LASS) facility at the Stanford Linear Accelerator Center (SLAC). By selecting the very forward produced K/sup -/..pi../sup +/ events, a sample consisting of data for the K..pi.. ..-->.. K..pi.. elastic scattering reaction was extracted. The angular distribution for this meson-meson scattering is studied by use of both a spherical harmonic moments analysis and a partial-wave analysis (PWA). The previously established leading natural spin-parity strange meson resonances (the J/sup P/ = 1/sup -/ K*(895), the 2/sup +/ K*(1430), and the 3/sup -/ K*(1780)) are observed in the results from both the moments analysis and the PWA. In addition, evidence for a new spin 4/sup -/ K* resonance with a mass of 2080 MeV and a width of about 225 MeV is presented. The results from the PWA confirm the existence of a 0/sup +/ kappa (1490) and propose the existence of a second scalar meson resonance, the 0/sup +/ kappa' (1900). Structure in the P-wave amplitude indicates resonance behavior in the mass region near 1700 MeV. In two of the four ambiguous solutions for the mass region above 1800 MeV, there is strong evidence for another P-wave resonant structure near 2100 MeV. The observed strange meson resonances are found to have a natural interpretation in terms of states predicted by the quark model. In particular, the mass splittings of the leading trajectory natural spin-parity strange meson states and the mass splittings between the spin-orbit triplet states are discussed. 59 figures, 17 tables.

  6. Theoretical overview: The New mesons

    Energy Technology Data Exchange (ETDEWEB)

    Quigg, Chris; /Fermilab

    2004-11-01

    After commenting on the state of contemporary hadronic physics and spectroscopy, I highlight four areas where the action is: searching for the relevant degrees of freedom, mesons with beauty and charm, chiral symmetry and the D{sub sJ} levels, and X(3872) and the lost tribes of charmonium.

  7. On the Partial-Wave Analysis of Mesonic Resonances Decaying to Multiparticle Final States Produced by Polarized Photons

    Energy Technology Data Exchange (ETDEWEB)

    Salgado, Carlos W. [Norfolk State University, Norfolk, VA (United States) and Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Weygand, Dennis P. [Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

    2014-04-01

    Meson spectroscopy is going through a revival with the advent of high statistics experiments and new advances in the theoretical predictions. The Constituent Quark Model (CQM) is finally being expanded considering more basic principles of field theory and using discrete calculations of Quantum Chromodynamics (lattice QCD). These new calculations are approaching predictive power for the spectrum of hadronic resonances and decay modes. It will be the task of the new experiments to extract the meson spectrum from the data and compare with those predictions. The goal of this report is to describe one particular technique for extracting resonance information from multiparticle final states. The technique described here, partial wave analysis based on the helicity formalism, has been used at Brookhaven National Laboratory (BNL) using pion beams, and Jefferson Laboratory (Jlab) using photon beams. In particular this report broaden this technique to include production experiments using linearly polarized real photons or quasi-real photons. This article is of a didactical nature. We describe the process of analysis, detailing assumptions and formalisms, and is directed towards people interested in starting partial wave analysis.

  8. On the partial-wave analysis of mesonic resonances decaying to multiparticle final states produced by polarized photons

    Energy Technology Data Exchange (ETDEWEB)

    Salgado, Carlos W., E-mail: salgado@jlab.org [Norfolk State University (United States); The Thomas Jefferson National Accelerator Facility (United States); Weygand, Dennis P. [The Thomas Jefferson National Accelerator Facility (United States)

    2014-04-01

    Meson spectroscopy is going through a revival with the advent of high statistics experiments and new advances in the theoretical predictions. The Constituent Quark Model (CQM) is finally being expanded considering more basic principles of field theory and using discrete calculations of Quantum Chromodynamics (lattice QCD). These new calculations are approaching predictive power for the spectrum of hadronic resonances and decay modes. It will be the task of the new experiments to extract the meson spectrum from the data and compare with those predictions. The goal of this report is to describe one particular technique for extracting resonance information from multiparticle final states. The technique described here, partial wave analysis based on the helicity formalism, has been used at Brookhaven National Laboratory (BNL) using pion beams, and Jefferson Laboratory (JLab) using photon beams. In particular this report broadens this technique to include production experiments using linearly polarized real photons or quasi-real photons. This article is of a didactical nature. We describe the process of analysis, detailing assumptions and formalisms, and is directed towards people interested in starting partial wave analysis.

  9. Strangeness and Charm in Nuclear Matter

    CERN Document Server

    Tolos, Laura; Garcia-Recio, Carmen; Molina, Raquel; Nieves, Juan; Oset, Eulogio; Ramos, Angels; Romanets, Olena; Salcedo, Lorenzo Luis

    2012-01-01

    The properties of strange ($K$, $\\bar K$ and $\\bar K^*$) and open-charm ($D$, $\\bar D$ and $D^*$) mesons in dense matter are studied using a unitary approach in coupled channels for meson-baryon scattering. In the strangeness sector, the interaction with nucleons always comes through vector-meson exchange, which is evaluated by chiral and hidden gauge Lagrangians. For the interaction of charmed mesons with nucleons we extend the SU(3) Weinberg-Tomozawa Lagrangian to incorporate spin-flavor symmetry and implement a suitable flavor symmetry breaking. The in-medium solution for the scattering amplitude accounts for Pauli blocking effects and meson self-energies. On one hand, we obtain the $K$, $\\bar K$ and $\\bar K^*$ spectral functions in the nuclear medium and study their behaviour at finite density, temperature and momentum. We also make an estimate of the transparency ratio of the $\\gamma A \\to K^+ K^{*-} A^\\prime$ reaction, which we propose as a tool to detect in-medium modifications of the $\\bar K^*$ meson....

  10. Heavy mesons spectroscopy and new quarks

    International Nuclear Information System (INIS)

    The spectroscopy of new heavy mesons with masses above 2.8 GeV in the context of the asymptoticallty free gauge theories is analysed. To this end a power -law confinement potential is chosen. It is shown that the charmonium spectroscopy is best described by a potential where the exponent is around 0.5. It is observed that the spin-spin interaction is problematic. A possible interpretation of the γ resonances in the neighbourhood of 10 GeV is also discussed. The possible consequences of the existence of heavy quarks beyond charm with special reference to the processes initiated by neutral currents is also discussed. The present results on processes initiated by neutral current effects does not require introduction of right-handed heavy quarks beyond charm. Inclusion of the sea-quark contribution improves the agreements of the results of the Salam-Weinberg model with the recently observed results from CERN where 'ν anomaly' was not seen. The recently discovered γ resonances probably indicate the existence of heavy quarks probably with left handed coupling. Some preliminary study of this possibility was also carried out. (Author)

  11. Open charm tomography of cold nuclear matter

    CERN Document Server

    Vitev, I; Johnson, M B; Qiu, J W

    2006-01-01

    We study the relative contribution of partonic sub-processes to D meson production and D meson-triggered inclusive di-hadrons to lowest order in perturbative QCD. While gluon fusion dominates the creation of large angle DD-bar pairs, charm on light parton scattering determines the yield of single inclusive D mesons. The distinctly different non-perturbative fragmentation of c quarks into D mesons versus the fragmentation of quarks and gluons into light hadrons results in a strong transverse momentum dependence of anticharm content of the away-side charm-triggered jet. In p+A reactions, we calculate and resum the coherent nuclear-enhanced power corrections from the final state partonic scattering in the medium. We find that single and double inclusive open charm production can be suppressed as much as the yield of neutral pions from dynamical high-twist shadowing. Effects of energy loss in p+A collisions are also investigated phenomenologically and may lead to significantly weaker transverse momentum dependenc...

  12. B decays to open charm

    CERN Document Server

    Haines, Susan Carol

    2016-01-01

    Studies of $B$ meson decays to states involving open charm mesons in data recorded by the LHCb experiment have resulted in first observations of several new decay modes, including $B_s^{0} \\rightarrow D_s^{*\\mp} K^{\\pm}$, $B_s^{0} \\rightarrow \\overline{D}^{0} K_S^{0}$ and $B^{+} \\rightarrow D^{+} K^{+} \\pi^{-}$ decays. An upper limit has been placed on the branching fraction of $B_s^{0} \\rightarrow \\overline{D}^{0} f_0(980)$ decays. Measurements of other branching fractions, such as those of $B_s^{0} \\rightarrow D_s^{(*)+} D_s^{(*)-}$ decays, are the most precise to date. Additionally, amplitude analyses of $B^{0} \\rightarrow \\overline{D}^{0} \\pi^{+} \\pi^{-}$ and $B^{0} \\rightarrow \\overline{D}^{0} K^{+} \\pi^{-}$ decays have been performed, alongside the first $CP$ violation analysis using the Dalitz plot of $B^{0} \\rightarrow D K^{+} \\pi^{-}$ decays.

  13. Meson resonances and glueballs: theoretical review and relevance to PP at LEAR

    International Nuclear Information System (INIS)

    Some theoretical ideas about the meson spectrum are reviewed and lessons which may be learned about it in PP-bar annihilation are considered. Experimental questions which, if answered, would have the largest impact on the present understanding of quark and gluon interactions are noted. Conventional qq-bar mesons as treated in potential models, concentrating on the familiar cc-bar systems, are reviewed. The exciting possibility is discussed of detecting constituent gluons in PP-bar annihilations, in gg states - which may already have been detected in e+e- and PP-bar, as will be seen and in the exotic Jsup(PC) 'hermaphrodite' states qq-bar, for which there is currently no experimental evidence. (author)

  14. Meson resonances and glueballs: Theoretical review and relevance to p-p at LEAR

    International Nuclear Information System (INIS)

    This chapter reviews some theoretical ideas about the meson spectrum and briefly discusses what may be learned about it in p-p annihilation. Conventional q-q mesons as treated in potential models are examined by focusing on the familiar c-c system. The possibility of detecting constituent gluons in p-p annihilation, in gg states (which may already have been detected in e+e- and p-p) and in the exotic J /SUP PC/ ''hermaphrodite'' states q-qg, is investigated. The Low-Energy Antiproton Ring (LEAR) energies could be increased so that c-c production occurs, although there are no plans to study charmonium at LEAR. The c-c models are compared with scalar and vector long-range potentials in order to see which levels best distinguish them. Some theoretical ideas about the gg glueball spectrum, arising from lattices, QCD sum rules, bag models, and potential models, are considered

  15. Measurement of charm fragmentation fractions in photoproduction at HERA

    International Nuclear Information System (INIS)

    The production of D0, D*+, D+, Ds+ and Λc+ charm hadrons and their antiparticles in ep scattering at HERA has been studied with the ZEUS detector, using a total integrated luminosity of 372 pb-1. The fractions of charm quarks hadronising into a particular charm hadron were derived. In addition, the ratio of neutral to charged D-meson production rates, the fraction of charged D mesons produced in a vector state, and the strangeness-suppression factor have been determined. The measurements have been performed in the photoproduction regime. The charm hadrons were reconstructed in the range of transverse momentum pT > 3.8GeV and pseudorapidity vertical stroke η vertical stroke +e- experiments. The data support the hypothesis that fragmentation is independent of the production process.

  16. Photoproduction of pi0-mesons off neutrons in the nucleon resonance region

    OpenAIRE

    Dieterle, M.; Keshelashvili, I.; Ahrens, J; Annand, J. R. M.; Arends, H.J.(Institut für Kernphysik, University of Mainz, Mainz, D-55099, Germany); Bantawa, K.(Kent State University, Kent, OH, 44242, USA); Bartolome, P. A.; Beck, R.; Bekrenev, V.; Braghieri, A.; Branford, D.; Briscoe, W. J.; Brudvik, J.; Cherepnya, S.; Demissie, B.

    2014-01-01

    Precise angular distributions have been measured for the first time for the photoproduction of $\\pi^{0}$-mesons off neutrons bound in the deuteron. The effects from nuclear Fermi motion have been eliminated by a complete kinematic reconstruction of the final state. The influence of final-state-interaction effects has been estimated by a comparison of the reaction cross section for quasi-free protons bound in the deuteron to the results for free protons and then applied as a correction to the ...

  17. Charm and bottom hadronic form factors with QCD sum rules

    International Nuclear Information System (INIS)

    We present a brief review of some calculations of form factors and coupling constants in vertices with charm and bottom mesons in the framework of QCD sum rules. We first discuss the motivation for this work, describing possible applications of these form factors to charm and bottom decays processes. We first make a summarize of the QCD sum rules method. We give special attention to the uncertainties of the method introducing by the intrinsic variation of the parameters. Finally we conclude.

  18. Hyperon and charmed baryon masses and nucleon excited states from lattice QCD

    CERN Document Server

    Alexandrou, Constantia

    2014-01-01

    We discuss the status of current dynamical lattice QCD simulations in connection to the emerging results on the strange and charmed baryon spectrum, excited states of the nucleon and the investigation of the structure of scalar mesons.

  19. Prospects of discovering new physics in rare charm decays

    CERN Document Server

    Fajfer, Svjetlana

    2015-01-01

    The LHCb bounds on the branching ratio of rare decay $D^0 \\to \\mu^+ \\mu^-$ and the constraints on the branching fraction of $D^+ \\to \\pi^+ \\mu^+ \\mu^-$ in the non-resonant regions enable us to improve constraints on new physics contributions. Using the effective Lagrangian approach we determine size of the Wilson coefficients allowed by the existing LHCb bounds on rare charm decays. Then we discuss contributions to rare charm meson decay observables in a specific model: model of extra vector weak triplet boson, leptoquark model, Two Higgs doublets model of type III. Here we complement the discussion by $D^0 - \\bar D^0$ oscillations data. Among considered models, only leptoquarks can significantly modify Wilson coefficients. Assuming that the differential decay width for $D^+ \\to \\pi^+ \\mu^+ \\mu^-$ receives NP contribution, while the differential decay width for $D^+ \\to \\pi^+ e^+ e^-$ is SM-like, we find that lepton flavour universality can be violated and it might be observed at high dilepton invariant mass.

  20. Study of strange mesonic resonance production in K-p interactions at 14.3GeV/c

    International Nuclear Information System (INIS)

    The production of strange S=-1 mesonic resonances in K-p interactions at 14.3GeV/c was studied. The experimental data come from a 1.3 million exposure of the CERN 2 meters hydrogen bubble chamber. The anti-Kπ system from the anti-KπN final state is analysed with emphasis on the comparison between the production mechanisms of the reactions K-p→anti-K*(890)N and K-p→anti-K*(1420)N. Evidence is given for the production of a new K*, the K*(1780) of spin-parity 3- and some of its important parameters are determined. The Triple Regge model predictions are verified for reactions with inclusive K* production: K-p→K*-(890)+X+ and K-p→anti-K*0(890)+X0

  1. Low-energy $DD^{*+}$ Scattering and the Resonance-like Structure $Z_c(3900)$

    CERN Document Server

    Chen, Ying; Lei, Yu-Hong; Li, Ning; Liang, Jian; Liu, Chuan; Liu, Hang; Liu, Jin-Long; Liu, Liuming; Liu, Yong-Fu; Liu, Yu-Bin; Liu, Zhaofeng; Ma, Jian-Ping; Wang, Zhan-Lin; Yang, Yi-Bo; Zhang, Jian-Bo

    2014-01-01

    In this exploratory lattice study, low-energy scattering of $D$ and $D^*$ meson are analyzed using lattice QCD with $N_f=2$ twisted mass fermion configurations with three pion mass values. The calculation is performed within single-channel L\\"uscher's finite-size formalism. The threshold scattering parameters, namely the scattering length $a_0$ and the effective range $r_0$, for the $s$-wave scattering in $J^P=1^+$ channel are extracted. For the cases in our study, the interaction between the two charmed mesons is weakly repulsive. Our lattice results therefore do not support the possibility of a shallow bound state for the two charmed mesons for the pion mass values we studied. This calculation provides some useful information on the nature of the newly discovered resonance-like structure $Z_c(3900)$ by various experimental groups.

  2. Charm photoproduction at 20 GeV

    International Nuclear Information System (INIS)

    Sixty-two events have been observed in an exposure of the SLAC Hybrid Facility to a backward scattered laser beam. Based on 22 neutral and 21 charged decays the charmed meson lifetimes have been measured to be tausub(D)o = (6.8sub(-1.8)sup(+2.3)) x 10-13s, tausub(D)+- = (7.4sub(-2.0)sup(+2.3)) x 10-13s and their ratio tausub(D)+-/tausub(D)o = 1.1sub(-0.3)sup(+0.6). The inclusive charm cross section at a photon energy of 20 GeV has been measured to be (56sub(-23)sup(+24) nb). Evidence is presented for a non D D component to charm production, consistent with 35 +- 20% Λ+sub(c) production and some D*+- production. No unambiguous F decays have been found. (author)

  3. SU(3) flavour symmetry breaking and charmed states

    International Nuclear Information System (INIS)

    By extending the SU(3) flavour symmetry breaking expansion from up, down and strange sea quark masses to partially quenched valence quark masses we propose a method to determine charmed quark hadron masses including possible QCD isospin breaking effects. Initial results for some open charmed pseudoscalar meson states and singly and doubly charmed baryon states are encouraging and demonstrate the potential of the procedure. Essential for the method is the determination of the scale using singlet quantities, and to this end we also give here a preliminary estimation of the recently introduced Wilson flow scales.

  4. SU(3) flavour symmetry breaking and charmed states

    Energy Technology Data Exchange (ETDEWEB)

    Horsley, R. [Edinburgh Univ. (United Kingdom). School of Physics and Astronomy; Najjar, J. [Regensburg Univ. (Germany). Institut fuer Theoretische Physik; Nakamura, Y. [RIKEN Advanced Institute for Computational Science, Hyogo (Japan); Perlt, H.; Schiller, A. [Leipzig Univ. (Germany). Inst. fuer Theoretische Physik; Pleiter, D. [Forschungszentrum Juelich GmbH (Germany). Juelich Supercomputing Centre (JSC); Regensburg Univ. (Germany). Institut fuer Theoretische Physik; Rakow, P.E.L. [Liverpool Univ. (United Kingdom). Theoretical Physics Div.; Schierholz, G. [Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Stueben, H. [Hamburg Univ. (Germany). Regionales Rechenzentrum; Zanotti, J.M. [Adelaide Univ. (Australia). CSSM, School of Chemistry and Physics; Collaboration: QCDSF-UKQCD Collaborations

    2013-11-15

    By extending the SU(3) flavour symmetry breaking expansion from up, down and strange sea quark masses to partially quenched valence quark masses we propose a method to determine charmed quark hadron masses including possible QCD isospin breaking effects. Initial results for some open charmed pseudoscalar meson states and singly and doubly charmed baryon states are encouraging and demonstrate the potential of the procedure. Essential for the method is the determination of the scale using singlet quantities, and to this end we also give here a preliminary estimation of the recently introduced Wilson flow scales.

  5. Generalized charge symmetry and charmed particle decays

    International Nuclear Information System (INIS)

    The charge symmetry operations are introduced within the c, s and p, n quark doublets and its consequences for weak decays proceeding via the GIM current, are studied. Numerous relations between various decays are obtained. Combined with CP an interesting pattern of allowed and suppressed amplitudes for charmed meson and baryon processes is found. The results are compatible with the present meagre experimental information. (Auth.)

  6. New Physics from rare decays of charm

    CERN Document Server

    Petrov, Alexey A

    2016-01-01

    Abundance of charm data in the current and future low energy flavor experiments makes it possible to study rare decays of D-mesons with ever increased precision. I discuss theoretical implications of derived constraints on New Physics models from these transitions. I argue that those constraints could be competitive with results of direct searches for New Physics particles (including Dark Matter) at the Large Hadron Collider.

  7. Production rates of strange vector mesons at the Z{sup 0} resonance

    Energy Technology Data Exchange (ETDEWEB)

    Dima, M.O.

    1997-05-01

    This dissertation presents a study of strange vector meson production, {open_quotes}leading particle{close_quotes} effect and a first direct measurement of the strangeness suppression parameter in hadronic decays of the neutral electroweak boson, Z{sup 0}. The measurements were performed in e{sup +}e{sup -} collisions at the Stanford Linear Accelerator Center (SLAC) with the SLC Large Detector (SLD) experiment. A new generation particle ID system, the SLD Cerenkov Ring Imaging Detector (CRID) is used to discriminate kaons from pions, enabling the reconstruction of the vector mesons over a wide momentum range. The inclusive production rates of {phi} and K*{sup 0} and the differential rates versus momentum were measured and are compared with those of other experiments and theoretical predictions. The high longitudinal polarisation of the SLC electron beam is used in conjunction with the electroweak quark production asymmetries to separate quark jets from antiquark jets. K*{sup 0} production is studied separately in these samples, and the results show evidence for the {open_quotes}leading particle{close_quotes} effect. The difference between K*{sup 0} production rates at high momentum in quark and antiquark jets yields a first direct measurement of strangeness suppression in jet fragmentation.

  8. Production rates of strange vector mesons at the Z0 resonance

    International Nuclear Information System (INIS)

    This dissertation presents a study of strange vector meson production, open-quotes leading particleclose quotes effect and a first direct measurement of the strangeness suppression parameter in hadronic decays of the neutral electroweak boson, Z0. The measurements were performed in e+e- collisions at the Stanford Linear Accelerator Center (SLAC) with the SLC Large Detector (SLD) experiment. A new generation particle ID system, the SLD Cerenkov Ring Imaging Detector (CRID) is used to discriminate kaons from pions, enabling the reconstruction of the vector mesons over a wide momentum range. The inclusive production rates of φ and K*0 and the differential rates versus momentum were measured and are compared with those of other experiments and theoretical predictions. The high longitudinal polarisation of the SLC electron beam is used in conjunction with the electroweak quark production asymmetries to separate quark jets from antiquark jets. K*0 production is studied separately in these samples, and the results show evidence for the open-quotes leading particleclose quotes effect. The difference between K*0 production rates at high momentum in quark and antiquark jets yields a first direct measurement of strangeness suppression in jet fragmentation

  9. Identification of non-ordinary mesons from the dispersive connection between their poles and their Regge trajectories: The f0(500) resonance

    International Nuclear Information System (INIS)

    We show how the Regge trajectory of a resonance can be obtained from its pole in a scattering process and analytic constraints in the complex angular momentum plane. The method is suited for resonances that dominate an elastic scattering amplitude. In particular, from the ρ(770) resonance pole in ππ scattering, we obtain its linear Regge trajectory, characteristic of ordinary quark-antiquark states. In contrast, the f0(500) pole -- the sigma meson -- which dominates scalar isoscalar ππ scattering, yields a nonlinear trajectory with a much smaller slope at the f0(500) mass. Conversely, imposing a linear Regge trajectory for the f0(500), with a slope of typical size, yields an elastic amplitude at odds with the data. This provides strong support for the non-ordinary nature of the sigma meson

  10. Pseudoscalar meson physics with four dynamical quarks

    CERN Document Server

    Bazavov, A; Bouchard, C; DeTar, C; Du, D; El-Khadra, A X; Foley, J; Freeland, E D; Gamiz, E; Gottlieb, Steven; Heller, U M; Hetrick, J E; Kim, J; Kronfeld, A S; Laiho, J; Levkova, L; Lightman, M; Mackenzie, P B; Neil, E T; Oktay, M; Simone, J N; Sugar, R L; Toussaint, D; Van de Water, R S; Zhou, R

    2012-01-01

    We present preliminary results for light, strange and charmed pseudoscalar meson physics from simulations using four flavors of dynamical quarks with the highly improved staggered quark (HISQ) action. These simulations include lattice spacings ranging from 0.15 to 0.06 fm, and sea-quark masses both above and at their physical value. The major results are charm meson decay constants f_D, f_{D_s} and f_{D_s}/f_D and ratios of quark masses. This talk will focus on our procedures for finding the decay constants on each ensemble, the continuum extrapolation, and estimates of systematic error.

  11. Evidence for new meson resonances from the reaction pp - K-K+

    International Nuclear Information System (INIS)

    The differential cross-sections for anti p p → K-K+ provide new evidence for mesons with masses between 2.1 and 2.5 GeV/c2. The zeros of the cross-sections suggest the existence of Jsup(P) = 3- states with both I = 1 and I = 0 at masses between 2.1 and 2.18 GeV/c2. The results also support a Jsup(P) = 4+ state near 2.34 GeV and are consistent with 5- states in both I = 1 and 1 = 0 close to 2.5 GeV. This analysis confirms the I = 1 3-, 5-, and I = 0 4+ states seen previously in anti p p → π-π+ and is in agreement with the existing data for the non-annihilation processes. (author)

  12. CP violation and mixing in charm decays at Belle

    Energy Technology Data Exchange (ETDEWEB)

    Ko, Byeong Rok [Korea University (Korea, Republic of)

    2010-07-01

    We have searched for CP violation of charmed mesons in the decays D {yields} K{sup 0}{sub S} P, where D denotes D{sup 0}, D{sup +} and D{sub s}{sup +}, and P denotes the pseudo-scalar mesons {pi}{sup +}, K{sup +}, {pi}{sup 0}, {eta} and {eta}'. No evidence of CP violation in these decays is observed. We have measured the CP asymmetry difference between the Cabibbo suppressed decay D{sup +} {yields} {phi} {pi}{sup +} and the Cabibbo favored D{sub s}{sup +} {yields} {phi} {pi}{sup +} decays. The measured asymmetry is corrected for the residual asymmetry due to detector effects, and the contributions of both CP and forward-backward asymmetries are determined. We also present a measurement of D{sup 0}-anti-D{sup 0} mixing parameters in three-body D{sup 0} decays using a time-dependent Dalitz plot analysis. These results are obtained on a large data sample collected at and near the {Upsilon}(4S) resonance with the Belle detector operating at the KEKB asymmetric-energy e{sup +} e{sup -} collider. (author)

  13. Modelling duality between bound and resonant meson spectra by means of free quantum motions on the de Sitter space-time dS4

    Science.gov (United States)

    Kirchbach, M.; Compean, C. B.

    2016-07-01

    The real parts of the complex squared energies defined by the resonance poles of the transfer matrix of the Pöschl-Teller barrier, are shown to equal the squared energies of the levels bound within the trigonometric Scarf well potential. By transforming these potentials into parts of the Laplacians describing free quantum motions on the mutually orthogonal open-time-like hyperbolic-, and closed-space-like spherical geodesics on the conformally invariant de Sitter space-time, dS4, the conformal symmetries of these interactions are revealed. On dS4 the potentials under consideration naturally relate to interactions within colorless two-body systems and to cusped Wilson loops. In effect, with the aid of the dS4 space-time as unifying geometry, a conformal symmetry based bijective correspondence (duality) between bound and resonant meson spectra is established at the quantum mechanics level and related to confinement understood as color charge neutrality. The correspondence allows to link the interpretation of mesons as resonance poles of a scattering matrix with their complementary description as states bound by an instantaneous quark interaction and to introduce a conformal symmetry based classification scheme of mesons. As examples representative of such a duality we organize in good agreement with data 71 of the reported light flavor mesons with masses below ˜ 2350 MeV into four conformal families of particles placed on linear f0, π , η , and a0 resonance trajectories, plotted on the ℓ/ M plane. Upon extending the sec2 χ by a properly constructed conformal color dipole potential, shaped after a tangent function, we predict the masses of 12 "missing" mesons. We furthermore notice that the f0 and π trajectories can be viewed as chiral partners, same as the η and a0 trajectories, an indication that chiral symmetry for mesons is likely to be realized in terms of parity doubled conformal multiplets rather than, as usually assumed, only in terms of parity

  14. Calculation of Regge trajectories of strange resonances and identification of the K0*(800) as a non-ordinary meson

    CERN Document Server

    Peláez, J R

    2016-01-01

    We review how the Regge trajectory of an elastic resonance can be obtained just from its pole position and coupling, using a dispersive formalism. This allows us to deal correctly with the finite widths of resonances in Regge trajectories. In this way we can calculate the Regge trajectories for the $K^*(892)$, $K_1(1400)$ and $K^*_0(1430)$, obtaining ordinary linear Regge trajectories, expected for $q \\bar q$ resonances. In contrast, for the $K^*_0(800)$ meson, the resulting Regge trajectory is non-linear and with much smaller slope, strongly supporting its non-ordinary nature.

  15. Charmed tetraquarks T{sub cc} and T{sub cs} from dynamical lattice QCD simulations

    Energy Technology Data Exchange (ETDEWEB)

    Ikeda, Yoichi, E-mail: yikeda@riken.jp [Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198 (Japan); Charron, Bruno [Department of Physics, The University of Tokyo, Tokyo 113-0033 (Japan); Aoki, Sinya [Yukawa Institute of Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan); Center for Computational Sciences, University of Tsukuba, Ibaraki 305-8571 (Japan); Doi, Takumi [Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198 (Japan); Hatsuda, Tetsuo [Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198 (Japan); Kavli IPMU (WPI), The University of Tokyo, Chiba 606-8502 (Japan); Inoue, Takashi [College of Bioresource Science, Nihon University, Kanagawa 252-0880 (Japan); Ishii, Noriyoshi [Center for Computational Sciences, University of Tsukuba, Ibaraki 305-8571 (Japan); Murano, Keiko [Yukawa Institute of Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan); Nemura, Hidekatsu; Sasaki, Kenji [Center for Computational Sciences, University of Tsukuba, Ibaraki 305-8571 (Japan)

    2014-02-05

    Charmed tetraquarks T{sub cc}=(ccu{sup ¯}d{sup ¯}) and T{sub cs}=(csu{sup ¯}d{sup ¯}) are studied through the S-wave meson–meson interactions, D–D, K{sup ¯}–D, D–D{sup ⁎} and K{sup ¯}–D{sup ⁎}, on the basis of the (2+1)-flavor lattice QCD simulations with the pion mass m{sub π}≃410, 570 and 700 MeV. For the charm quark, the relativistic heavy quark action is employed to treat its dynamics on the lattice. Using the HAL QCD method, we extract the S-wave potentials in lattice QCD simulations, from which the meson–meson scattering phase shifts are calculated. The phase shifts in the isospin triplet (I=1) channels indicate repulsive interactions, while those in the I=0 channels suggest attraction, growing as m{sub π} decreases. This is particularly prominent in the T{sub cc}(J{sup P}=1{sup +},I=0) channel, though neither bound state nor resonance are found in the range m{sub π}=410–700 MeV. We make a qualitative comparison of our results with the phenomenological diquark picture.

  16. Exclusive charm production in pbar p collisions at s^1/2 <15 GeV

    CERN Document Server

    Titov, A I

    2008-01-01

    We discuss the open charm production in peripheral reactions $\\bar pp\\to \\bar Y_cY_c$ and $\\bar pp\\to M_c\\bar M_c$, where $Y_c$ and $M_c$ stand for $\\Lambda_c^+,\\Sigma_c^+$ and $D,D^*$, respectively, at $\\sqrt{s}\\lesssim 15$ GeV, which corresponds to the energy range of FAIR. Our consideration is based on the topological decomposition of the planar quark and diquark diagrams which allows to estimate consistently meson and baryon exchange trajectories and energy scale parameters as well. The spin dependence is determined by the effective interaction of lowest exchanged resonance. Unknown parameters are fixed by an independent analysis of open strangeness production in $\\bar pp\\to \\bar YY$ and $\\bar pp\\to \\bar KK$ reactions and of SU(4) symmetry. We present the corresponding cross sections and longitudinal double-spin asymmetries for exclusive binary reactions with open charm mesons and baryons in the final state. The polarization observables have a non-trivial $t$ and $s$ dependence which is sensitive to detai...

  17. Kaons in flavor tagged B meson decays

    International Nuclear Information System (INIS)

    Using the ARGUS detector at the e+e- storage ring DORIS II, measurements of multiplicities of pseudoscalar kaons, of K*(892) and of φ(1020) in B meson decays have been performed through studies of angular and charge correlations between the above particles and high momentum leptons produced in semileptonic B decays. The method has made it possible to measure the multiplicities separately for B-mesons and anti-B-mesons. The excess of like charge lepton-kaon pairs over opposite charge pairs in semileptonic decays was used for estimating the ratio of charmed decays over all decays, and thus also the fraction of charmless decays. A search for an excess of fast neutral kaons from rare B decays was also made. All the results obtained support the assumption that almost all B mesons decay through b → c transitions into charmed hadrons. (66 refs.)

  18. Coupled-channel study of crypto-exotic baryons with charm

    International Nuclear Information System (INIS)

    Identifying a zero-range exchange of vector mesons as the driving force for the s-wave scattering of pseudo-scalar mesons off the baryon ground states, a rich spectrum of molecules is formed. We argue that chiral symmetry and large-Nc considerations determine that part of the interaction which generates the spectrum. A bound state with exotic quantum numbers is predicted at mass 2.78 GeV. It couples strongly to the (D-bar sN),(D-bar Λ),(D-bar Σ) channels. A further charm minus-one system is predicted at mass 2.84 GeV as a result of (D-bar sΛ),(D-bar Ξ) interactions. We suggest the existence of strongly bound crypto-exotic baryons, which contain a charm-anti-charm pair. Such states are narrow since they can decay only via OZI-violating processes. A narrow nucleon resonance is found at mass 3.52 GeV. It is a coupled-channel bound state of the (ηcN),(D-bar Σc) system, which decays dominantly into the (η'N) channel. Furthermore two isospin singlet hyperon states at mass 3.23 and 3.58 GeV are observed as a consequence of coupled-channel interactions of the (D-bar sΛc),(D-bar Ξc) and (ηcΛ),(D-bar Ξc') states. Most striking is the small width of about 1 MeV of the lower state. The upper state may be significantly broader due to a strong coupling to the (η'Λ) state. The spectrum of crypto-exotic charm-zero states is completed with an isospin triplet state at 3.93 GeV and an isospin doublet state at 3.80 GeV. The dominant decay modes involve again the η' meson. The two so far observed s-wave baryons with charm one are recovered. We argue that the Λc(2880) is not a s-wave state. In addition to those states we predict the existence of about ten narrow s-wave baryon states with masses below 3 GeV. A triplet of crypto-exotic states decaying dominantly into channels with an η' is obtained with masses 4.24 and 4.44 GeV. In the charm-two sector we predict in addition to the chiral excitations of the ground states two triplets of bound states formed by channels

  19. Measurement of Charm and Beauty Photoproduction at HERA using D* mu Correlations

    CERN Document Server

    Aktas, A; Anthonis, T; Asmone, A; Babaev, A; Backovic, S; Bähr, J; Baranov, P; Barrelet, E; Bartel, Wulfrin; Baumgartner, S; Becker, J; Beckingham, M; Behnke, O; Behrendt, O; Belousov, A; Berger, C; Berger, N; Berndt, T; Bizot, J C; Böhme, J; Boenig, M O; Boudry, V; Bracinik, J; Brisson, V; Broker, H B; Brown, D P; Bruncko, Dusan; Büsser, F W; Bunyatyan, A; Buschhorn, G; Bystritskaya, L; Campbell, A J; Caron, S; Cassol-Brunner, F; Cerny, K; Chekelian, V; Contreras, J G; Coppens, Y R; Coughlan, J A; Cox, B E; Cozzika, G; Cvach, J; Dainton, J B; Dau, W D; Daum, K; Delcourt, B; Demirchyan, R; de Roeck, A; Desch, Klaus; De Wolf, E A; Diaconu, C; Dingfelder, J; Dodonov, V; Dubak, A; Duprel, C; Eckerlin, G; Efremenko, V; Egli, S; Eichler, R; Eisele, F; Ellerbrock, M; Elsen, E; Erdmann, W; Faulkner, P J W; Favart, L; Fedotov, A; Felst, R; Ferencei, J; Fleischer, M; Fleischmann, P; Fleming, Y H; Flucke, G; Flügge, G; Fomenko, A; Foresti, I; Formánek, J; Franke, G; Frising, G; Gabathuler, Erwin; Gabathuler, K; Garutti, E; Garvey, J; Gayler, J; Gerhards, R; Gerlich, C; Ghazaryan, S; Ginzburgskaya, S; Görlich, L; Gogitidze, N; Gorbounov, S; Grab, C; Grässler, Herbert; Greenshaw, T; Gregori, M; Grindhammer, G; Gwilliam, C; Haidt, D; Hajduk, L; Haller, J; Hansson, M; Heinzelmann, G; Henderson, R C W; Henschel, H; Henshaw, O; Herrera-Corral, G; Herynek, I; Heuer, R D; Hildebrandt, M; Hiller, K H; Hoting, P; Hoffmann, D; Horisberger, R P; Hovhannisyan, A; Ibbotson, M; Ismail, M; Jacquet, M; Janauschek, L; Janssen, X; Jemanov, V; Jönsson, L B; Johnson, D P; Jung, H; Kant, D; Kapichine, M; Karlsson, M; Katzy, J; Keller, N; Kenyon, I R; Kiesling, C; Klein, M; Kleinwort, C; Klimkovich, T; Kluge, T; Knies, G; Knutsson, A; Koblitz, B; Korbel, V; Kostka, P; Koutouev, R; Kropivnitskaya, A; Kroseberg, J; Krüger, K; Kuckens, J; Landon, M P J; Lange, W; Lastoviicka, T; Laycock, P; Lebedev, A; Leiner, B; Lemrani, R; Lendermann, V; Levonian, S; Lindfeld, L; Lipka, K; List, B; Lobodzinska, E; Loktionova, N; López-Fernandez, R; Lubimov, V; Lüders, H; Lüke, D; Lux, T; Lytkin, L; Makankine, A; Malden, N; Malinovskii, E I; Mangano, S; Marage, P; Marks, J; Marshall, R; Martisikova, M; Martyn, H U; Maxfield, S J; Meer, D; Mehta, A; Meier, K; Meyer, A B; Meyer, H; Meyer, J; Mikocki, S; Milcewicz-Mika, I; Milstead, D; Mohamed, A; Moreau, F; Morozov, A; Morris, J V; Mozer, M U; Müller, K; Murn, P; Nagovizin, V; Nankov, K; Naroska, Beate; Naumann, J; Naumann, T; Newman, P R; Niebuhr, C B; Nikiforov, A; Nikitin, D K; Nowak, G; Nozicka, M; Oganezov, R; Olivier, B; Olsson, J E; Ozerov, D; Paramonov, A A; Pascaud, C; Patel, G D; Peez, M; Pérez, E; Perieanu, A; Petrukhin, A; Pitzl, D; Placakyte, R; Pöschl, R; Portheault, B; Povh, B; Raicevic, N; Reimer, P; Reisert, B; Rimmer, A; Risler, C; Rizvi, E; Robmann, P; Roland, B; Roosen, R; Rostovtsev, A; Rurikova, Z; Rusakov, S V; Rybicki, K; Sankey, D P C; Sauvan, E; Schatzel, S; Scheins, J; Schilling, F P; Schleper, P; Schmidt, S; Schmitt, S; Schneider, M; Schoeffel, L; Schöning, A; Schröder, V; Schultz-Coulon, H C; Schwanenberger, C; Sedlak, K; Sefkow, F; Shevyakov, I; Shtarkov, L N; Sirois, Y; Sloan, T; Smirnov, P; Soloviev, Yu; South, D; Spaskov, V; Specka, A; Spitzer, H; Stamen, R; Stella, B; Stiewe, J; Strauch, I; Straumann, U; Tchoulakov, V; Thompson, G; Thompson, P D; Tomasz, F; Traynor, D; Truöl, P; Tsipolitis, G; Tsurin, I; Turnau, J; Tzamariudaki, E; Uraev, A; Urban, M; Usik, A; Utkin, D; Valkár, S; Valkárová, A; Vallée, C; Van Mechelen, P; Van Remortel, N; Vargas-Trevino, A; Vazdik, Ya A; Veelken, C; Vest, A; Vinokurova, S; Volchinski, V; Wacker, K; Wagner, J; Weber, G; Weber, R; Wegener, D; Werner, C; Werner, N; Wessels, M; Wessling, B; Winter, G G; Wissing, C; Woerling, E E; Wolf, R; Wünsch, E; Xella, S M; Yan, W; Yeganov, V; Zaicek, J; Zaleisak, J; Zhang, Z; Zhelezov, A; Zhokin, A; Zohrabyan, H G; Zomer, F

    2005-01-01

    A measurement of charm and beauty photoproduction at the electron proton collider HERA is presented based on the simultaneous detection of a D*^{\\pm} meson and a muon. The correlation between the D* meson and the muon serves to separate the charm and beauty contributions and the analysis provides comparable sensitivity to both. The total and differential experimental cross sections are compared to LO and NLO QCD calculations. The measured charm cross section is in good agreement with QCD predictions including higher order effects while the beauty cross section is higher.

  20. Measurement of charm and beauty photoproduction at HERA using Dμ correlations

    Science.gov (United States)

    H1 Collaboration; Aktas, A.; Andreev, V.; Anthonis, T.; Aplin, S.; Asmone, A.; Astvatsatourov, A.; Babaev, A.; Backovic, S.; Bähr, J.; Baghdasaryan, A.; Baranov, P.; Barrelet, E.; Bartel, W.; Baudrand, S.; Baumgartner, S.; Becker, J.; Beckingham, M.; Behnke, O.; Behrendt, O.; Belousov, A.; Berger, Ch.; Berger, N.; Bizot, J. C.; Boenig, M.-O.; Boudry, V.; Bracinik, J.; Brandt, G.; Brisson, V.; Brown, D. P.; Bruncko, D.; Büsser, F. W.; Bunyatyan, A.; Buschhorn, G.; Bystritskaya, L.; Campbell, A. J.; Caron, S.; Cassol-Brunner, F.; Cerny, K.; Cerny, V.; Chekelian, V.; Contreras, J. G.; Coughlan, J. A.; Cox, B. E.; Cozzika, G.; Cvach, J.; Dainton, J. B.; Dau, W. D.; Daum, K.; Delcourt, B.; Demirchyan, R.; de Roeck, A.; Desch, K.; de Wolf, E. A.; Diaconu, C.; Dodonov, V.; Dubak, A.; Eckerlin, G.; Efremenko, V.; Egli, S.; Eichler, R.; Eisele, F.; Ellerbrock, M.; Elsen, E.; Erdmann, W.; Essenov, S.; Falkewicz, A.; Faulkner, P. J. W.; Favart, L.; Fedotov, A.; Felst, R.; Ferencei, J.; Finke, L.; Fleischer, M.; Fleischmann, P.; Fleming, Y. H.; Flucke, G.; Fomenko, A.; Foresti, I.; Formánek, J.; Franke, G.; Frising, G.; Frisson, T.; Gabathuler, E.; Garutti, E.; Gayler, J.; Gerhards, R.; Gerlich, C.; Ghazaryan, S.; Ginzburgskaya, S.; Glazov, A.; Glushkov, I.; Goerlich, L.; Goettlich, M.; Gogitidze, N.; Gorbounov, S.; Goyon, C.; Grab, C.; Greenshaw, T.; Gregori, M.; Grindhammer, G.; Gwilliam, C.; Haidt, D.; Hajduk, L.; Haller, J.; Hansson, M.; Heinzelmann, G.; Henderson, R. C. W.; Henschel, H.; Henshaw, O.; Herrera, G.; Hildebrandt, M.; Hiller, K. H.; Hoffmann, D.; Horisberger, R.; Hovhannisyan, A.; Ibbotson, M.; Ismail, M.; Jacquet, M.; Janauschek, L.; Janssen, X.; Jemanov, V.; Jönsson, L.; Johnson, D. P.; Jung, H.; Kapichine, M.; Karlsson, M.; Katzy, J.; Keller, N.; Kenyon, I. R.; Kiesling, C.; Klein, M.; Kleinwort, C.; Klimkovich, T.; Kluge, T.; Knies, G.; Knutsson, A.; Korbel, V.; Kostka, P.; Koutouev, R.; Krastev, K.; Kretzschmar, J.; Kropivnitskaya, A.; Krüger, K.; Kückens, J.; Landon, M. P. J.; Lange, W.; Laštovička, T.; Laycock, P.; Lebedev, A.; Leißner, B.; Lendermann, V.; Levonian, S.; Lindfeld, L.; Lipka, K.; List, B.; Lobodzinska, E.; Loktionova, N.; Lopez-Fernandez, R.; Lubimov, V.; Lucaci-Timoce, A.-I.; Lueders, H.; Lüke, D.; Lux, T.; Lytkin, L.; Makankine, A.; Malden, N.; Malinovski, E.; Mangano, S.; Marage, P.; Marshall, R.; Martisikova, M.; Martyn, H.-U.; Maxfield, S. J.; Meer, D.; Mehta, A.; Meier, K.; Meyer, A. B.; Meyer, H.; Meyer, J.; Mikocki, S.; Milcewicz-Mika, I.; Milstead, D.; Mohamed, A.; Moreau, F.; Morozov, A.; Morris, J. V.; Mozer, M. U.; Müller, K.; Murín, P.; Nankov, K.; Naroska, B.; Naumann, J.; Naumann, Th.; Newman, P. R.; Niebuhr, C.; Nikiforov, A.; Nikitin, D.; Nowak, G.; Nozicka, M.; Oganezov, R.; Olivier, B.; Olsson, J. E.; Osman, S.; Ozerov, D.; Palichik, V.; Papadopoulou, T.; Pascaud, C.; Patel, G. D.; Peez, M.; Perez, E.; Perez-Astudillo, D.; Perieanu, A.; Petrukhin, A.; Pitzl, D.; Plačakytė, R.; Portheault, B.; Povh, B.; Prideaux, P.; Raicevic, N.; Reimer, P.; Rimmer, A.; Risler, C.; Rizvi, E.; Robmann, P.; Roland, B.; Roosen, R.; Rostovtsev, A.; Rurikova, Z.; Rusakov, S.; Salvaire, F.; Sankey, D. P. C.; Sauvan, E.; Schätzel, S.; Schilling, F.-P.; Schmidt, S.; Schmitt, S.; Schmitz, C.; Schoeffel, L.; Schöning, A.; Schröder, V.; Schultz-Coulon, H.-C.; Schwanenberger, C.; Sedlák, K.; Sefkow, F.; Sheviakov, I.; Shtarkov, L. N.; Sirois, Y.; Sloan, T.; Smirnov, P.; Soloviev, Y.; South, D.; Spaskov, V.; Specka, A.; Stella, B.; Stiewe, J.; Strauch, I.; Straumann, U.; Tchoulakov, V.; Thompson, G.; Thompson, P. D.; Tomasz, F.; Traynor, D.; Truöl, P.; Tsakov, I.; Tsipolitis, G.; Tsurin, I.; Turnau, J.; Tzamariudaki, E.; Urban, M.; Usik, A.; Utkin, D.; Valkár, S.; Valkárová, A.; Vallée, C.; van Mechelen, P.; van Remortel, N.; Vargas Trevino, A.; Vazdik, Y.; Veelken, C.; Vest, A.; Vinokurova, S.; Volchinski, V.; Vujicic, B.; Wacker, K.; Wagner, J.; Weber, G.; Weber, R.; Wegener, D.; Werner, C.; Werner, N.; Wessels, M.; Wessling, B.; Wigmore, C.; Winter, G.-G.; Wissing, Ch.; Wolf, R.; Wünsch, E.; Xella, S.; Yan, W.; Yeganov, V.; Žáček, J.; Zálešák, J.; Zhang, Z.; Zhelezov, A.; Zhokin, A.; Zimmermann, J.; Zohrabyan, H.; Zomer, F.

    2005-08-01

    A measurement of charm and beauty photoproduction at the electron proton collider HERA is presented based on the simultaneous detection of a D meson and a muon. The correlation between the D meson and the muon serves to separate the charm and beauty contributions and the analysis provides comparable sensitivity to both. The total and differential experimental cross sections are compared to LO and NLO QCD calculations. The measured charm cross section is in good agreement with QCD predictions including higher order effects while the beauty cross section is higher.

  1. Measurement of charm and beauty photoproduction at HERA using D* μ correlations

    Science.gov (United States)

    Aktas, A.; Andreev, V.; Anthonis, T.; Aplin, S.; Asmone, A.; Astvatsatourov, A.; Babaev, A.; Backovic, S.; Bähr, J.; Baghdasaryan, A.; Baranov, P.; Barrelet, E.; Bartel, W.; Baudrand, S.; Baumgartner, S.; Becker, J.; Beckingham, M.; Behnke, O.; Behrendt, O.; Belousov, A.; Berger, Ch.; Berger, N.; Bizot, J. C.; Boenig, M.-O.; Boudry, V.; Bracinik, J.; Brandt, G.; Brisson, V.; Brown, D. P.; Bruncko, D.; Büsser, F. W.; Bunyatyan, A.; Buschhorn, G.; Bystritskaya, L.; Campbell, A. J.; Caron, S.; Cassol-Brunner, F.; Cerny, K.; Cerny, V.; Chekelian, V.; Contreras, J. G.; Coughlan, J. A.; Cox, B. E.; Cozzika, G.; Cvach, J.; Dainton, J. B.; Dau, W. D.; Daum, K.; Delcourt, B.; Demirchyan, R.; De Roeck, A.; Desch, K.; De Wolf, E. A.; Diaconu, C.; Dodonov, V.; Dubak, A.; Eckerlin, G.; Efremenko, V.; Egli, S.; Eichler, R.; Eisele, F.; Ellerbrock, M.; Elsen, E.; Erdmann, W.; Essenov, S.; Falkewicz, A.; Faulkner, P. J. W.; Favart, L.; Fedotov, A.; Felst, R.; Ferencei, J.; Finke, L.; Fleischer, M.; Fleischmann, P.; Fleming, Y. H.; Flucke, G.; Fomenko, A.; Foresti, I.; Formánek, J.; Franke, G.; Frising, G.; Frisson, T.; Gabathuler, E.; Garutti, E.; Gayler, J.; Gerhards, R.; Gerlich, C.; Ghazaryan, S.; Ginzburgskaya, S.; Glazov, A.; Glushkov, I.; Goerlich, L.; Goettlich, M.; Gogitidze, N.; Gorbounov, S.; Goyon, C.; Grab, C.; Greenshaw, T.; Gregori, M.; Grindhammer, G.; Gwilliam, C.; Haidt, D.; Hajduk, L.; Haller, J.; Hansson, M.; Heinzelmann, G.; Henderson, R. C. W.; Henschel, H.; Henshaw, O.; Herrera, G.; Hildebrandt, M.; Hiller, K. H.; Hoffmann, D.; Horisberger, R.; Hovhannisyan, A.; Ibbotson, M.; Ismail, M.; Jacquet, M.; Janauschek, L.; Janssen, X.; Jemanov, V.; Jönsson, L.; Johnson, D. P.; Jung, H.; Kapichine, M.; Karlsson, M.; Katzy, J.; Keller, N.; Kenyon, I. R.; Kiesling, C.; Klein, M.; Kleinwort, C.; Klimkovich, T.; Kluge, T.; Knies, G.; Knutsson, A.; Korbel, V.; Kostka, P.; Koutouev, R.; Krastev, K.; Kretzschmar, J.; Kropivnitskaya, A.; Krüger, K.; Kückens, J.; Landon, M. P. J.; Lange, W.; Laštovička, T.; Laycock, P.; Lebedev, A.; Leißner, B.; Lendermann, V.; Levonian, S.; Lindfeld, L.; Lipka, K.; List, B.; Lobodzinska, E.; Loktionova, N.; Lopez-Fernandez, R.; Lubimov, V.; Lucaci-Timoce, A.-I.; Lueders, H.; Lüke, D.; Lux, T.; Lytkin, L.; Makankine, A.; Malden, N.; Malinovski, E.; Mangano, S.; Marage, P.; Marshall, R.; Martisikova, M.; Martyn, H.-U.; Maxfield, S. J.; Meer, D.; Mehta, A.; Meier, K.; Meyer, A. B.; Meyer, H.; Meyer, J.; Mikocki, S.; Milcewicz-Mika, I.; Milstead, D.; Mohamed, A.; Moreau, F.; Morozov, A.; Morris, J. V.; Mozer, M. U.; Müller, K.; Murín, P.; Nankov, K.; Naroska, B.; Naumann, J.; Naumann, Th.; Newman, P. R.; Niebuhr, C.; Nikiforov, A.; Nikitin, D.; Nowak, G.; Nozicka, M.; Oganezov, R.; Olivier, B.; Olsson, J. E.; Osman, S.; Ozerov, D.; Palichik, V.; Papadopoulou, T.; Pascaud, C.; Patel, G. D.; Peez, M.; Perez, E.; Perez-Astudillo, D.; Perieanu, A.; Petrukhin, A.; Pitzl, D.; Plačakytė, R.; Portheault, B.; Povh, B.; Prideaux, P.; Raicevic, N.; Reimer, P.; Rimmer, A.; Risler, C.; Rizvi, E.; Robmann, P.; Roland, B.; Roosen, R.; Rostovtsev, A.; Rurikova, Z.; Rusakov, S.; Salvaire, F.; Sankey, D. P. C.; Sauvan, E.; Schätzel, S.; Schilling, F.-P.; Schmidt, S.; Schmitt, S.; Schmitz, C.; Schoeffel, L.; Schöning, A.; Schröder, V.; Schultz-Coulon, H.-C.; Schwanenberger, C.; Sedlák, K.; Sefkow, F.; Sheviakov, I.; Shtarkov, L. N.; Sirois, Y.; Sloan, T.; Smirnov, P.; Soloviev, Y.; South, D.; Spaskov, V.; Specka, A.; Stella, B.; Stiewe, J.; Strauch, I.; Straumann, U.; Tchoulakov, V.; Thompson, G.; Thompson, P. D.; Tomasz, F.; Traynor, D.; Truöl, P.; Tsakov, I.; Tsipolitis, G.; Tsurin, I.; Turnau, J.; Tzamariudaki, E.; Urban, M.; Usik, A.; Utkin, D.; Valkár, S.; Valkárová, A.; Vallée, C.; Van Mechelen, P.; Van Remortel, N.; Vargas Trevino, A.; Vazdik, Y.; Veelken, C.; Vest, A.; Vinokurova, S.; Volchinski, V.; Vujicic, B.; Wacker, K.; Wagner, J.; Weber, G.; Weber, R.; Wegener, D.; Werner, C.; Werner, N.; Wessels, M.; Wessling, B.; Wigmore, C.; Winter, G.-G.; Wissing, Ch.; Wolf, R.; Wünsch, E.; Xella, S.; Yan, W.; Yeganov, V.; Žáček, J.; Zálešák, J.; Zhang, Z.; Zhelezov, A.; Zhokin, A.; Zimmermann, J.; Zohrabyan, H.; Zomer, F.; H1 Collaboration

    2005-08-01

    A measurement of charm and beauty photoproduction at the electron proton collider HERA is presented based on the simultaneous detection of a D*± meson and a muon. The correlation between the D* meson and the muon serves to separate the charm and beauty contributions and the analysis provides comparable sensitivity to both. The total and differential experimental cross sections are compared to LO and NLO QCD calculations. The measured charm cross section is in good agreement with QCD predictions including higher order effects while the beauty cross section is higher.

  2. QCD sum rule study of hidden-charm pentaquarks

    CERN Document Server

    Chen, Hua-Xing; Chen, Wei; Steele, T G; Liu, Xiang; Zhu, Shi-Lin

    2016-01-01

    We study the mass spectra of hidden-charm pentaquarks having spin $J = {1\\over2},{3\\over2},{5\\over2}$ and quark contents $uud c \\bar c$. We systematically construct all the relevant local hidden-charm pentaquark currents, and select some of them to perform QCD sum rule analyses. We find that the $P_c(4380)$ and $P_c(4450)$ can be identified as hidden-charm pentaquark states composed of an anti-charmed meson and a charmed baryon. We also find the lowest-lying hidden-charm $J^P = 1/2^-$ pentaquark state of mass $4.33^{+0.17}_{-0.13}$ GeV, while the $J^P = 1/2^+$ mass prediction of 4.7--4.9 GeV is significantly higher. Similarly, the lowest-lying hidden-charm $J^P = 3/2^-$ pentaquark state mass is $4.37^{+0.18}_{-0.13}$ GeV, consistent with the $J^P = 3/2^-$ $P_c(4380)$, while the $J^P = 3/2^+$ is also significantly higher with a mass above 4.6 GeV. The hidden-charm $J^P = 5/2^-$ pentaquark state mass is 4.5--4.6 GeV, slightly larger than the $J^P = 5/2^+$ $P_c(4450)$.

  3. Meson Spectroscopy without Tetraquarks

    CERN Document Server

    Bugg, D V

    2011-01-01

    Data on e+e- -> piplus-piminus-Upsilon(1S,2S,3S) show a large increase in branching fractions near Upsilon(10860). A suggestion of Ali et al. is to interpret this as evidence for a tetraquark, Yb(10890) = b-bbar. However, it may also be interpreted in terms of Upsilon(10860) -> B-B*, B*B* and BsB*s above the open-b threshold, followed by de-excitation processes such as $BB* -> Upsilon (1S,2S,3S). In the charm sector, a hypothesis open to experimental test is that X,Y and Z peaks in the mass range 3872 to 3945 MeV may all be due to regular 3P1 and 3P2 c-cbar states (and perhaps 3P0) mixed with meson-meson.

  4. Photoproduction of pi0-mesons off neutrons in the nucleon resonance region

    CERN Document Server

    Dieterle, M; Ahrens, J; Annand, J R M; Arends, H J; Bantawa, K; Bartolome, P A; Beck, R; Bekrenev, V; Braghieri, A; Branford, D; Briscoe, W J; Brudvik, J; Cherepnya, S; Demissie, B; Downie, E J; Drexler, P; Fil'kov, L V; Fix, A; Glazier, D I; Hamilton, D; Heid, E; Hornidge, D; Howdle, D; Huber, G M; Jaegle, I; Jahn, O; Jude, T C; Kaeser, A; Kashevarov, V L; Kondratiev, R; Korolija, M; Kruglov, S P; Krusche, B; Kulbardis, A; Lisin, V; Livingston, K; MacGregor, I J D; Maghrbi, Y; Mancell, J; Manley, D M; Marinides, Z; Martinez, M; McGeorge, J C; McNicoll, E; Mekterovic, D; Metag, V; Micanovic, S; Middleton, D G; Mushkarenkov, A; Nefkens, B M K; Nikolaev, A; Novotny, R; Oberle, M; Ostrick, M; Oussena, B; Pedroni, P; Pheron, F; Polonski, A; Prakhov, S N; Robinson, J; Rosner, G; Rostomyan, T; Schumann, S; Sikora, M H; Sober, D; Starostin, A; Supek, I; Thiel, M; Thomas, A; Unverzagt, M; Watts, D P; Werthmueller, D; Witthauer, L

    2014-01-01

    Precise angular distributions have been measured for the first time for the photoproduction of $\\pi^{0}$-mesons off neutrons bound in the deuteron. The effects from nuclear Fermi motion have been eliminated by a complete kinematic reconstruction of the final state. The influence of final-state-interaction effects has been estimated by a comparison of the reaction cross section for quasi-free protons bound in the deuteron to the results for free protons and then applied as a correction to the quasi-free neutron data. The experiment was performed at the tagged photon facility of the Mainz Microtron MAMI with the Crystal Ball and TAPS detector setup for incident photon energies between $0.45$~GeV and $1.4$~GeV. The results are compared to the predictions from reaction models and partial-wave analyses based on data from other isospin channels. The model predictions show large discrepancies among each other and the present data will provide much tighter constraints. This is demonstrated by the results of a new ana...

  5. Hadroproduction of charm particles

    International Nuclear Information System (INIS)

    Charm hadroproduction is in its second generation in experiment and theory. There is no recent evidence for the large effects that are not easily explained in QCD models. There is evidence for similarity in the gluon structure functions in pions and kaons, and softer gluon distributions in protons. The fragmentation process for charm quarks appears to be very hard. Topics included in this discussion are a brief history of measurements and theory, a discussion of techniques, QCD theory of charm hadroproduction, recent data on inclusive charm hadroproduction, correlations in the production of charm pairs, and nuclear target dependence. 79 refs., 10 figs., 5 tabs

  6. Inclusive Φ-meson production in electron-positron interactions in the energy region of the γ-resonances

    International Nuclear Information System (INIS)

    We report on a high precision measurement of Φ-meson production in continuum events and in direct decays of the Υ(1S)- and Υ(2S)-mesons. The ratio of the total production rate of Φ-mesons in direct Υ(1S)- and Υ(2S)-decays over that in continuum events is 1.32±0.08±0.09 and 1.07±0.13±0.11 respectively. This is compatible with the corresponding ratio obtained for lighter mesons, but is appreciably smaller than the relative baryon production rate. (orig.)

  7. Charm and beauty measurements at Fermilab fixed target

    International Nuclear Information System (INIS)

    Eighteen months after a successful run of the Fermilab fixed target program, interesting results from several experiments are available. This is the first time that more than one Fermilab fixed target experiment has reported the observation of beauty mesons. In this paper the author reviews recent results from charm and beauty fixed target experiments at Fermilab

  8. Charm and beauty measurements at Fermilab fixed target

    International Nuclear Information System (INIS)

    Eighteen months after a successful run of the Fermilab fixed target program, interesting results from several experiments are available. This is the first time that more than one Fermilab fixed target experiment has reported the observation of beauty mesons. In this paper we review recent results from charm and beauty fixed target experiments at Fermilab

  9. Baryons and Mesons with Beauty

    OpenAIRE

    Goldstein, Gary R.; Wali, Kameshwar C.

    2007-01-01

    Recent experimental findings of several mesons and baryons with "beauty" and "charm" as flavors remind us of the days when strangeness was discovered, and how its inclusion led to SU(3)-flavor symmetry with enormous success in the classification of the "proliferated" states into SU(3) multiplets. One of the key elements was the successful application of the first order perturbation in symmetry breaking, albeit what then appeared to be huge mass differences, and the prediction of new states th...

  10. Open-charm enhancement at FAIR?

    CERN Document Server

    Tolos, L; Stöcker, H; Tolos, Laura; Schaffner-Bielich, Juergen; Stoecker, Horst

    2006-01-01

    We have calculated the D-meson spectral density at finite temperature within a self-consistent coupled-channel approach that generates dynamically the $\\Lambda_c$ (2593) resonance. We find a small mass shift for the D-meson in this hot and dense medium while the spectral density develops a sizeable width. The reduced attraction felt by the D-meson in hot and dense matter together with the large width observed have important consequences for the D-meson production in the future CBM experiment at FAIR.

  11. Measurement of Inclusive Production of eta, eta' and phi Mesons in D0, D+ and Ds+ Decays

    CERN Document Server

    Huang, G S; Adams, G S; Alexander, J P; Anderson, M; Aquines, O; Artuso, M; Asner, D M; Athar, S B; Berkelman, K; Besson, D; Blusk, S; Bonvicini, G; Briere, R A; Butt, J; Cassel, D G; Cawlfield, C; Chen, J; Cinabro, D; Coan, T E; Cronin-Hennessy, D; Csorna, S E; Cummings, J P; Danko, I; Dobbs, S; Duboscq, J E; Dubrovin, M; Dytman, S A; Ecklund, K M; Edwards, K W; Ehrlich, R; Eisenstein, B I; Ernst, J; Ferguson, T; Fields, L; Galik, R S; Gao, K Y; Gao, Y S; Gibbons, L; Gray, R; Gray, S W; Hartill, D L; He, Q; Heltsley, B K; Hertz, D; Hietala, J; Insler, J; Jones, C D; Kandaswamy, J; Karliner, I; Kim, D; Klein, T; Kreinick, D L; Kubota, Y; Kuznetsov, V E; Lang, B W; Li, J; Li, Z; Lincoln, A; Love, W; Lowrey, N; López, A; Mahlke-Krüger, H; Mehrabyan, S S; Menaa, N; Metreveli, Z V; Miller, D H; Mitchell, R E; Mountain, R; Muramatsu, H; Méndez, H; Naik, P; Napolitano, J; Nisar, S; Onyisi, P U E; Park, C S; Patel, R; Patterson, J R; Pavlunin, V; Pedlar, T K; Peterson, D; Pivarski, J; Poling, R; Potlia, V; Ramírez, J; Randrianarivony, K; Riley, D; Rosner, J L; Rubin, P; Ryd, A; Sadoff, A J; Sanghi, B; Savinov, V; Schwarthoff, H; Scott, A W; Sedlack, C; Selen, M; Seth, K K; Severini, H; Shepherd, M R; Shi, X; Shipsey, I P J; Sia, R; Skwarnicki, T; Smith, A; Stone, S; Stroiney, S; Sun, W M; Tatishvili, G T; Thorndike, E H; Tomaradze, A G; Vogel, H; Wang, J C; Watkins, M E; Weinberger, M; White, E J; Wilksen, T; Wiss, J; Xin, B; Yang, F; Yelton, J; Zhang, K; Zweber, P; al, et

    2006-01-01

    We measure the inclusive branching fractions of charm mesons into three mesons with large s-anti-s content, namely the eta, eta' and phi. Data were accumulated with the CLEO-c detector. For D0 and D+ rates, we use 281/pb taken on the psi(3770) resonance, and for Ds+ rates, we use 195/pb taken at 4170 MeV. We find that the production rates of these particles are larger in Ds+ decays than in D0 and D+ decays. The phi rate, in particular, is 15 times greater. These branching fractions can be used to measure Bs yields either at the Upsilon(5S) resonance or at hadron colliders.

  12. Electroproduction of Eta Mesons in the S11(1535) Resonance Region at High Momentum Transfer

    Energy Technology Data Exchange (ETDEWEB)

    Dalton, Mark; Adams, Gary; Ahmidouch, Abdellah; Angelescu, Tatiana; Arrington, John; Asaturyan, Razmik; Baker, Keith; Benmouna, Nawal; Bertoncini, Crystal; Boeglin, Werner; Bosted, Peter; Breuer, Herbert; Christy, Michael; Connell, S.; Cui, Y.; Danagoulian, Samuel; Day, Donal; Dodario, T.; Dunne, James; Dutta, Dipangkar; Khayari, N.El; Ent, R.; Fenker, Howard; Frolov, Valera; Gan, Liping; Gaskell, David; Hafidi, Kawtar; Hinton, Wendy; Holt, Roy; Horn, Tanja; Huber, Garth; Hungerford, Ed; Jiang, Xiaodong; Jones, Mark; Joo, Kyungseon; Kalantarians, Narbe; Kelly, J.J.; Keppel, Cynthia; Koubarovski, Valeri; Kubarovsky, Valery; Kubarovsky, Valery; Kubarovsky, Valery; Li, Y.; Liang, Y.; Malace, S.; Markowitz, Pete; McKee, Paul; Meekins, David; Mkrtchyan, Hamlet; Moziak, B.; Navasardyan, Tigran; Niculescu, Gabriel; Niculescu, Maria-Ioana; Opper, Allena; Ostapenko, Tanya; Reimer, Paul; Reinhold, Joerg; Roche, Julie; ROCK, S.E.; Schulte, Elaine; Segbefia, Edwin; Smith, C.; Smith, Gregory; Stoler, Paul; Tadevosyan, Vardan; Tang, Liguang; Tvaskis, Vladas; Ungaro, Maurizio; Uzzle, Alicia; Vidakovic, S.; Villano, A.; Vulcan, William; WANG, M.; Warren, Glen; Wesselmann, Frank; Wojtsekhowski, Bogdan; Wood, Stephen; Xu, C.; Yuan, Lulin; Zheng, Xiaochao; Guo Zhu, Hong

    2009-01-01

    The differential cross-section for the process p(e,e'p)eta has been measured at Q2 ~ 5.7 and 7.0 (GeV/c)2 for centre-of-mass energies from threshold to 1.8 GeV, encompassing the S11(1535) resonance, which dominates the channel. This is the highest momentum transfer measurement of this exclusive process to date. The helicity-conserving transition amplitude A_1/2, for the production of the S11(1535) resonance, is extracted from the data. This quantity appears to begin scaling as 1/Q3, a predicted signal of the dominance of perturbative QCD, at Q2 ~ 5 (GeV/c)2.

  13. Resonant behaviour in double charge exchange reaction of π+-mesons on the nuclear photoemulsion

    International Nuclear Information System (INIS)

    The invariant-mass spectra of the ppπ- and pp systems produced in the double charge exchange (DCX) of positively charged pions on photoemulsion are analysed. A pronounced peak is observed in the ppπ- invariant-mass spectrum, while the Mpp spectrum exhibits a strong Migdal-Watson effect of the proton-proton final-state interaction. These findings are in favor of the NN-decoupled NN π pseudoscalar resonance with T=0 called d'

  14. Lattice investigation of heavy meson interactions

    OpenAIRE

    Wagenbach, Björn; Bicudo, Pedro; Wagner, Marc

    2014-01-01

    We report on a lattice investigation of heavy meson interactions and of tetraquark candidates with two very heavy quarks. These two quarks are treated in the static limit, while the other two are up, down, strange or charm quarks of finite mass. Various isospin, spin and parity quantum numbers are considered.

  15. D-meson production by muons in the COMPASS experiment at CERN

    Energy Technology Data Exchange (ETDEWEB)

    Zvyagin, Alexander

    2011-01-21

    One of the physics goals of the COMPASS experiment at CERN was to measure the contribution of gluons to the nucleon spin. To achieve this, it was proposed to scatter polarized 160 GeV/c muons on a polarized deuteron target and to detect D mesons in the final state. The underlying process in this D meson production is supposed to be the Photon-Gluon Fusion (PGF), where a virtual photon emitted by the muon interacts with a gluon from the target nucleon, producing a charm-anticharm quark pair. Fragmentation of a charm (anticharm) quark leads with high probability to the creation of a D{sup 0} or D{sup *} meson, which COMPASS detects via the D{sup 0}{yields}K{pi} and D{sup *}{yields}D{sup 0}{pi}{yields}K{pi}{pi} decay modes. From the longitudinal cross section spin asymmetries of the D meson production and theoretical predictions for the PGF cross section, the gluon contribution to the nucleon spin has been measured by the COMPASS experiment. The results presented in the thesis are the following. Based on data from the year 2004 a total visible cross section of 1.8{+-}0.4 nb, for the D{sup *} meson production, has been measured, with the error being dominated by systematic effects. It is validated that the D mesons are indeed produced through the PGF process, by comparison of measured D meson kinematic distributions to the ones predicted by a theory (AROMA generator). A good agreement was found for the distribution shapes, which confirms that PGF plays a major role. However, a 20% difference was found in the number of produced D{sup 0} and D{sup 0} mesons (and for the D{sup *+} and D{sup *-} mesons as well) which is significantly larger than predicted by AROMA. Kinematic distributions of D{sup 0} and D{sup *} mesons were compared with the background and also with the nearby K{sup *}{sub 2}(1430){sup 0} resonance, using all longitudinal data taken in 2002-2006. The particle-antiparticle asymmetry has been studied as a function of several kinematic variables. The 20

  16. The hidden-charm pentaquark and tetraquark states

    Science.gov (United States)

    Chen, Hua-Xing; Chen, Wei; Liu, Xiang; Zhu, Shi-Lin

    2016-06-01

    In the past decade many charmonium-like states were observed experimentally. Especially those charged charmonium-like Zc states and bottomonium-like Zb states cannot be accommodated within the naive quark model. These charged Zc states are good candidates of either the hidden-charm tetraquark states or molecules composed of a pair of charmed mesons. Recently, the LHCb Collaboration discovered two hidden-charm pentaquark states, which are also beyond the quark model. In this work, we review the current experimental progress and investigate various theoretical interpretations of these candidates of the multiquark states. We list the puzzles and theoretical challenges of these models when confronted with the experimental data. We also discuss possible future measurements which may distinguish the theoretical schemes on the underlying structures of the hidden-charm multiquark states.

  17. Bottom-strange mesons in hyperonic matter

    OpenAIRE

    Pathak, Divakar; Mishra, Amruta

    2014-01-01

    The in-medium behavior of bottom-strange pseudoscalar mesons in hot, isospin asymmetric and dense hadronic environment is studied using a chiral effective model. The same was recently generalized to the heavy quark sector and employed to study the behavior of open-charm and open-bottom mesons. The heavy quark (anti-quark) is treated as frozen and all medium modifications of these bottom-strange mesons are due to their strange anti-quark (quark) content. We observe a pronounced dependence of t...

  18. Exclusive and inclusive decays of B mesons into Ds mesons

    International Nuclear Information System (INIS)

    We have studied the production of Ds mesons in the decays of B mesons at the Υ(4S) resonance. We report on the first observation of exclusive B-meson decays B→Ds-D*+, B→Ds-D+, and B→Ds-D0. We also present a new measurement of the branching ratio and the momentum spectrum for the inclusive decay B→DsX

  19. Charm production in two-photon collisions

    International Nuclear Information System (INIS)

    The analysis focuses on the production of charmonium resonances ηc, χ0 and χ2 in two-photon interactions. The measurement of the inclusive production of charged D* mesons is described. 97 refs.; 54 figs.; 15 tabs

  20. Recent results from Fermilab E-687, charm particle decays, lifetimes and photoproduction dynamics: A compilation results presented at DPF 1994

    Energy Technology Data Exchange (ETDEWEB)

    E687 Collaboration

    1994-10-01

    This report contains papers on the following topics: Recent results on the semi-leptonic decay Decay D{sup 0} {yields} K{sup {minus}}{mu}{sup +}{nu}{sub {mu}}; charmed mesons; observation of the Decay {Omega}{sub c}{sup 0}{Sigma}{sup +}K{sup {minus}}K{sup {minus}}{phi}{sup +}; the physics of charm lifetimes; and photoproduction of charmed hadrons. These papers have been cataloged separately.

  1. Measurement of D*±, D± and Ds± meson production cross sections in pp collisions at √{ s} = 7 TeV with the ATLAS detector

    Science.gov (United States)

    Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O.; Aben, R.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Abreu, R.; Abulaiti, Y.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Adelman, J.; Adomeit, S.; Adye, T.; Affolder, A. A.; Agatonovic-Jovin, T.; Aguilar-Saavedra, J. A.; Ahlen, S. P.; Ahmadov, F.; Aielli, G.; Akerstedt, H.; Åkesson, T. P. A.; Akimoto, G.; Akimov, A. V.; Alberghi, G. L.; Albert, J.; Albrand, S.; Alconada Verzini, M. J.; Aleksa, M.; Aleksandrov, I. N.; Alexa, C.; Alexander, G.; Alexopoulos, T.; Alhroob, M.; Alimonti, G.; Alio, L.; Alison, J.; Alkire, S. P.; Allbrooke, B. M. M.; Allport, P. P.; Aloisio, A.; Alonso, A.; Alonso, F.; Alpigiani, C.; Altheimer, A.; Alvarez Gonzalez, B.; Álvarez Piqueras, D.; Alviggi, M. G.; Amadio, B. T.; Amako, K.; Amaral Coutinho, Y.; Amelung, C.; Amidei, D.; Amor Dos Santos, S. P.; Amorim, A.; Amoroso, S.; Amram, N.; Amundsen, G.; Anastopoulos, C.; Ancu, L. S.; Andari, N.; Andeen, T.; Anders, C. F.; Anders, G.; Anders, J. K.; Anderson, K. J.; Andreazza, A.; Andrei, V.; Angelidakis, S.; Angelozzi, I.; Anger, P.; Angerami, A.; Anghinolfi, F.; Anisenkov, A. V.; Anjos, N.; Annovi, A.; Antonelli, M.; Antonov, A.; Antos, J.; Anulli, F.; Aoki, M.; Aperio Bella, L.; Arabidze, G.; Arai, Y.; Araque, J. P.; Arce, A. T. H.; Arduh, F. A.; Arguin, J.-F.; Argyropoulos, S.; Arik, M.; Armbruster, A. J.; Arnaez, O.; Arnal, V.; Arnold, H.; Arratia, M.; Arslan, O.; Artamonov, A.; Artoni, G.; Asai, S.; Asbah, N.; Ashkenazi, A.; Åsman, B.; Asquith, L.; Assamagan, K.; Astalos, R.; Atkinson, M.; Atlay, N. B.; Auerbach, B.; Augsten, K.; Aurousseau, M.; Avolio, G.; Axen, B.; Ayoub, M. K.; Azuelos, G.; Baak, M. A.; Baas, A. E.; Bacci, C.; Bachacou, H.; Bachas, K.; Backes, M.; Backhaus, M.; Bagiacchi, P.; Bagnaia, P.; Bai, Y.; Bain, T.; Baines, J. T.; Baker, O. K.; Balek, P.; Balestri, T.; Balli, F.; Banas, E.; Banerjee, Sw.; Bannoura, A. A. E.; Bansil, H. S.; Barak, L.; Barberio, E. L.; Barberis, D.; Barbero, M.; Barillari, T.; Barisonzi, M.; Barklow, T.; Barlow, N.; Barnes, S. L.; Barnett, B. M.; Barnett, R. M.; Barnovska, Z.; Baroncelli, A.; Barone, G.; Barr, A. J.; Barreiro, F.; Barreiro Guimarães da Costa, J.; Bartoldus, R.; Barton, A. E.; Bartos, P.; Basalaev, A.; Bassalat, A.; Basye, A.; Bates, R. L.; Batista, S. J.; Batley, J. R.; Battaglia, M.; Bauce, M.; Bauer, F.; Bawa, H. S.; Beacham, J. B.; Beattie, M. D.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Becker, K.; Becker, M.; Becker, S.; Beckingham, M.; Becot, C.; Beddall, A. J.; Beddall, A.; Bednyakov, V. A.; Bee, C. P.; Beemster, L. J.; Beermann, T. A.; Begel, M.; Behr, J. K.; Belanger-Champagne, C.; Bell, W. H.; Bella, G.; Bellagamba, L.; Bellerive, A.; Bellomo, M.; Belotskiy, K.; Beltramello, O.; Benary, O.; Benchekroun, D.; Bender, M.; Bendtz, K.; Benekos, N.; Benhammou, Y.; Benhar Noccioli, E.; Benitez Garcia, J. A.; Benjamin, D. P.; Bensinger, J. R.; Bentvelsen, S.; Beresford, L.; Beretta, M.; Berge, D.; Bergeaas Kuutmann, E.; Berger, N.; Berghaus, F.; Beringer, J.; Bernard, C.; Bernard, N. R.; Bernius, C.; Bernlochner, F. U.; Berry, T.; Berta, P.; Bertella, C.; Bertoli, G.; Bertolucci, F.; Bertsche, C.; Bertsche, D.; Besana, M. I.; Besjes, G. J.; Bessidskaia Bylund, O.; Bessner, M.; Besson, N.; Betancourt, C.; Bethke, S.; Bevan, A. J.; Bhimji, W.; Bianchi, R. M.; Bianchini, L.; Bianco, M.; Biebel, O.; Biedermann, D.; Bieniek, S. P.; Biglietti, M.; Bilbao De Mendizabal, J.; Bilokon, H.; Bindi, M.; Binet, S.; Bingul, A.; Bini, C.; Black, C. W.; Black, J. E.; Black, K. M.; Blackburn, D.; Blair, R. E.; Blanchard, J.-B.; Blanco, J. E.; Blazek, T.; Bloch, I.; Blocker, C.; Blum, W.; Blumenschein, U.; Bobbink, G. J.; Bobrovnikov, V. S.; Bocchetta, S. S.; Bocci, A.; Bock, C.; Boehler, M.; Bogaerts, J. A.; Bogavac, D.; Bogdanchikov, A. G.; Bohm, C.; Boisvert, V.; Bold, T.; Boldea, V.; Boldyrev, A. S.; Bomben, M.; Bona, M.; Boonekamp, M.; Borisov, A.; Borissov, G.; Borroni, S.; Bortfeldt, J.; Bortolotto, V.; Bos, K.; Boscherini, D.; Bosman, M.; Boudreau, J.; Bouffard, J.; Bouhova-Thacker, E. V.; Boumediene, D.; Bourdarios, C.; Bousson, N.; Boveia, A.; Boyd, J.; Boyko, I. R.; Bozic, I.; Bracinik, J.; Brandt, A.; Brandt, G.; Brandt, O.; Bratzler, U.; Brau, B.; Brau, J. E.; Braun, H. M.; Brazzale, S. F.; Breaden Madden, W. D.; Brendlinger, K.; Brennan, A. J.; Brenner, L.; Brenner, R.; Bressler, S.; Bristow, K.; Bristow, T. M.; Britton, D.; Britzger, D.; Brochu, F. M.; Brock, I.; Brock, R.; Bronner, J.; Brooijmans, G.; Brooks, T.; Brooks, W. K.; Brosamer, J.; Brost, E.; Brown, J.; Bruckman de Renstrom, P. A.; Bruncko, D.; Bruneliere, R.; Bruni, A.; Bruni, G.; Bruschi, M.; Bruscino, N.; Bryngemark, L.; Buanes, T.; Buat, Q.; Buchholz, P.; Buckley, A. G.; Buda, S. I.; Budagov, I. A.; Buehrer, F.; Bugge, L.; Bugge, M. K.; Bulekov, O.; Bullock, D.; Burckhart, H.; Burdin, S.; Burghgrave, B.; Burke, S.; Burmeister, I.; Busato, E.; Büscher, D.; Büscher, V.; Bussey, P.; Butler, J. M.; Butt, A. I.; Buttar, C. M.; Butterworth, J. M.; Butti, P.; Buttinger, W.; Buzatu, A.; Buzykaev, A. R.; Cabrera Urbán, S.; Caforio, D.; Cairo, V. M.; Cakir, O.; Calafiura, P.; Calandri, A.; Calderini, G.; Calfayan, P.; Caloba, L. P.; Calvet, D.; Calvet, S.; Camacho Toro, R.; Camarda, S.; Camarri, P.; Cameron, D.; Caminada, L. M.; Caminal Armadans, R.; Campana, S.; Campanelli, M.; Campoverde, A.; Canale, V.; Canepa, A.; Cano Bret, M.; Cantero, J.; Cantrill, R.; Cao, T.; Capeans Garrido, M. D. M.; Caprini, I.; Caprini, M.; Capua, M.; Caputo, R.; Cardarelli, R.; Cardillo, F.; Carli, T.; Carlino, G.; Carminati, L.; Caron, S.; Carquin, E.; Carrillo-Montoya, G. D.; Carter, J. R.; Carvalho, J.; Casadei, D.; Casado, M. P.; Casolino, M.; Castaneda-Miranda, E.; Castelli, A.; Castillo Gimenez, V.; Castro, N. F.; Catastini, P.; Catinaccio, A.; Catmore, J. R.; Cattai, A.; Caudron, J.; Cavaliere, V.; Cavalli, D.; Cavalli-Sforza, M.; Cavasinni, V.; Ceradini, F.; Cerio, B. C.; Cerny, K.; Cerqueira, A. S.; Cerri, A.; Cerrito, L.; Cerutti, F.; Cerv, M.; Cervelli, A.; Cetin, S. A.; Chafaq, A.; Chakraborty, D.; Chalupkova, I.; Chang, P.; Chapleau, B.; Chapman, J. D.; Charlton, D. G.; Chau, C. C.; Chavez Barajas, C. A.; Cheatham, S.; Chegwidden, A.; Chekanov, S.; Chekulaev, S. V.; Chelkov, G. A.; Chelstowska, M. A.; Chen, C.; Chen, H.; Chen, K.; Chen, L.; Chen, S.; Chen, X.; Chen, Y.; Cheng, H. C.; Cheng, Y.; Cheplakov, A.; Cheremushkina, E.; Cherkaoui El Moursli, R.; Chernyatin, V.; Cheu, E.; Chevalier, L.; Chiarella, V.; Childers, J. T.; Chiodini, G.; Chisholm, A. S.; Chislett, R. T.; Chitan, A.; Chizhov, M. V.; Choi, K.; Chouridou, S.; Chow, B. K. B.; Christodoulou, V.; Chromek-Burckhart, D.; Chudoba, J.; Chuinard, A. J.; Chwastowski, J. J.; Chytka, L.; Ciapetti, G.; Ciftci, A. 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B.; Vivarelli, I.; Vives Vaque, F.; Vlachos, S.; Vladoiu, D.; Vlasak, M.; Vogel, M.; Vokac, P.; Volpi, G.; Volpi, M.; von der Schmitt, H.; von Radziewski, H.; von Toerne, E.; Vorobel, V.; Vorobev, K.; Vos, M.; Voss, R.; Vossebeld, J. H.; Vranjes, N.; Vranjes Milosavljevic, M.; Vrba, V.; Vreeswijk, M.; Vuillermet, R.; Vukotic, I.; Vykydal, Z.; Wagner, P.; Wagner, W.; Wahlberg, H.; Wahrmund, S.; Wakabayashi, J.; Walder, J.; Walker, R.; Walkowiak, W.; Wang, C.; Wang, F.; Wang, H.; Wang, H.; Wang, J.; Wang, J.; Wang, K.; Wang, R.; Wang, S. M.; Wang, T.; Wang, X.; Wanotayaroj, C.; Warburton, A.; Ward, C. P.; Wardrope, D. R.; Warsinsky, M.; Washbrook, A.; Wasicki, C.; Watkins, P. M.; Watson, A. T.; Watson, I. J.; Watson, M. F.; Watts, G.; Watts, S.; Waugh, B. M.; Webb, S.; Weber, M. S.; Weber, S. W.; Webster, J. S.; Weidberg, A. R.; Weinert, B.; Weingarten, J.; Weiser, C.; Weits, H.; Wells, P. S.; Wenaus, T.; Wengler, T.; Wenig, S.; Wermes, N.; Werner, M.; Werner, P.; Wessels, M.; Wetter, J.; Whalen, K.; Wharton, A. M.; White, A.; White, M. J.; White, R.; White, S.; Whiteson, D.; Wickens, F. J.; Wiedenmann, W.; Wielers, M.; Wienemann, P.; Wiglesworth, C.; Wiik-Fuchs, L. A. M.; Wildauer, A.; Wilkens, H. G.; Williams, H. H.; Williams, S.; Willis, C.; Willocq, S.; Wilson, A.; Wilson, J. A.; Wingerter-Seez, I.; Winklmeier, F.; Winter, B. T.; Wittgen, M.; Wittkowski, J.; Wollstadt, S. J.; Wolter, M. W.; Wolters, H.; Wosiek, B. K.; Wotschack, J.; Woudstra, M. J.; Wozniak, K. W.; Wu, M.; Wu, M.; Wu, S. L.; Wu, X.; Wu, Y.; Wyatt, T. R.; Wynne, B. M.; Xella, S.; Xu, D.; Xu, L.; Yabsley, B.; Yacoob, S.; Yakabe, R.; Yamada, M.; Yamaguchi, Y.; Yamamoto, A.; Yamamoto, S.; Yamanaka, T.; Yamauchi, K.; Yamazaki, Y.; Yan, Z.; Yang, H.; Yang, H.; Yang, Y.; Yao, W.-M.; Yasu, Y.; Yatsenko, E.; Yau Wong, K. H.; Ye, J.; Ye, S.; Yeletskikh, I.; Yen, A. L.; Yildirim, E.; Yorita, K.; Yoshida, R.; Yoshihara, K.; Young, C.; Young, C. J. S.; Youssef, S.; Yu, D. R.; Yu, J.; Yu, J. M.; Yu, J.; Yuan, L.; Yurkewicz, A.; Yusuff, I.; Zabinski, B.; Zaidan, R.; Zaitsev, A. M.; Zalieckas, J.; Zaman, A.; Zambito, S.; Zanello, L.; Zanzi, D.; Zeitnitz, C.; Zeman, M.; Zemla, A.; Zengel, K.; Zenin, O.; Ženiš, T.; Zerwas, D.; Zhang, D.; Zhang, F.; Zhang, H.; Zhang, J.; Zhang, L.; Zhang, R.; Zhang, X.; Zhang, Z.; Zhao, X.; Zhao, Y.; Zhao, Z.; Zhemchugov, A.; Zhong, J.; Zhou, B.; Zhou, C.; Zhou, L.; Zhou, L.; Zhou, N.; Zhu, C. G.; Zhu, H.; Zhu, J.; Zhu, Y.; Zhuang, X.; Zhukov, K.; Zibell, A.; Zieminska, D.; Zimine, N. I.; Zimmermann, C.; Zimmermann, S.; Zinonos, Z.; Zinser, M.; Ziolkowski, M.; Živković, L.; Zobernig, G.; Zoccoli, A.; zur Nedden, M.; Zurzolo, G.; Zwalinski, L.

    2016-06-01

    The production of D*±, D± and Ds± charmed mesons has been measured with the ATLAS detector in pp collisions at √{ s} = 7 TeV at the LHC, using data corresponding to an integrated luminosity of 280 nb-1. The charmed mesons have been reconstructed in the range of transverse momentum 3.5 phase space, the strangeness-suppression factor in charm fragmentation, the fraction of charged non-strange D mesons produced in a vector state, and the total cross section of charm production at √{ s} = 7 TeV were derived.

  2. Non-leptonic decays of charmed and beautiful particles

    International Nuclear Information System (INIS)

    By fitting simultaneously the values of ξ=1/Nc and αs(mc2) on the inclusive rates of the Cabibbo allowed decays D, F→PP and D→PV, which are independent of the final state interactions, we find ξ=0 and αs(mc2)=0.44. In order to explain the rescattering of the final states produced in the non-leptonic decays of charmed D-particles and to make theoretical predictions for all the exclusive channels, we propose a rescattering model based on the production of resonances in SU(3)-symmetry. In the PP sector we predict a new multiplet of meson resonances 0+ which allows us with few free parameters, to obtain a satisfactory agreement between theoretical predictions and experimental data. Unfortunately, such an agreement cannot be obtained in the PV sector, for which the presence of other rescattering effects is needed to balance the exotic channel D+→PV. In the PV sector we do not use any free parameter. Finally, we also make predicitions for the Cabibbo allowed decay channels B→PP, PV, without considering in this case the final state interactions, because of the high energy of the decay products. (orig.)

  3. Non-leptonic decays of charmed and beautiful particles

    Energy Technology Data Exchange (ETDEWEB)

    Buccella, F.; Forte, M. (Naples Univ. (Italy). Ist. di Fisica Teorica); Miele, G. (Naples Univ. (Italy). Dipt. di Scienze Fisiche Istituto Nazionale di Fisica Nucleare, Naples (Italy)); Ricciardi, G. (Scuola Normale Superiore, Pisa (Italy) Istituto Nazionale di Fisica Nucleare, Pisa (Italy))

    1990-09-01

    By fitting simultaneously the values of {xi}=1/N{sub c} and {alpha}{sub s}(m{sub c}{sup 2}) on the inclusive rates of the Cabibbo allowed decays D, F{yields}PP and D{yields}PV, which are independent of the final state interactions, we find {xi}=0 and {alpha}{sub s}(m{sub c}{sup 2})=0.44. In order to explain the rescattering of the final states produced in the non-leptonic decays of charmed D-particles and to make theoretical predictions for all the exclusive channels, we propose a rescattering model based on the production of resonances in SU(3)-symmetry. In the PP sector we predict a new multiplet of meson resonances 0{sup +} which allows us with few free parameters, to obtain a satisfactory agreement between theoretical predictions and experimental data. Unfortunately, such an agreement cannot be obtained in the PV sector, for which the presence of other rescattering effects is needed to balance the exotic channel D{sup +}{yields}PV. In the PV sector we do not use any free parameter. Finally, we also make predicitions for the Cabibbo allowed decay channels B{yields}PP, PV, without considering in this case the final state interactions, because of the high energy of the decay products. (orig.).

  4. Open charm measurement with HFT at STAR

    Science.gov (United States)

    Kapitán, Jan

    2011-01-01

    Thermalization is one of the key questions in understanding the matter created in Au+Au collisions at RHIC. Heavy-flavor quark collectivity could be used to indicate the degree of thermalization of the light-flavor quarks. Heavy quark energy loss could give important information on color charge density of the medium. Direct reconstruction of open charm hadrons is essential for these measurements. The Heavy Flavor Tracker (HFT) is a proposed upgrade of the STAR experiment. Full GEANT simulation of tracking with HFT was performed, showing its excellent capability to reconstruct open charm hadrons in broad p_T range at midrapidity. Estimated errors on measurement of D0 meson v_2 and R_{CP} are presented.

  5. The properties of charmonium and charm particles

    International Nuclear Information System (INIS)

    An impressive amount of data has been accumulated over the past three years which support strongly the idea that elementary particles are composed of four quarks instead of three. All the predictions based on the existence of the fourth, the charm quark, have in principal been born out by experiments and from detailed investigations very interesting results could be obtained for the strong and the weak interaction. Most of these results have been obtained with electron-positron storage rings, and only these will be discussed in this report. Additional data from hadronic or neutrino interactions are in general agreement with the e+e- data and will not be discussed here. This series of lectures will be entirely devoted to a discussion of mesons, i.e. quark-antiquark systems. Although some indications have been found for the existence of charmed baryons, these data are still rather scanty. In the last chapter we shall also discuss the upsilon particle. (orig.)

  6. Open charm measurement with HFT at STAR

    CERN Document Server

    Kapitan, Jan

    2008-01-01

    Thermalization is one of the key questions in understanding the matter created in Au+Au collisions at RHIC. Heavy-flavor quark collectivity could be used to indicate the degree of thermalization of the light-flavor quarks. Heavy quark energy loss could give important information on color charge density of the medium. Direct reconstruction of open charm hadrons is essential for these measurements. The Heavy Flavor Tracker (HFT) is a proposed upgrade of the STAR experiment. Full GEANT simulation of tracking with HFT was performed, showing its excellent capability to reconstruct open charm hadrons in broad p_T range at midrapidity. Estimated errors on measurement of D0 meson v_2 and R_{CP} are presented.

  7. A U(4)r x U(4)l linear sigma model with (axial-)vector mesons

    International Nuclear Information System (INIS)

    We present a linear sigma model with U(4)r x U(4)l global chiral symmetry, which in addition to scalar and pseudoscalar mesons also includes vector and axial-vector mesons. Apart from three new parameters pertaining to the charm degree of freedom, the parameters of the model are fixed from the Nf = 3 flavor sector. Our results for the charmed meson masses and weak decay constants are in surprisingly good agreement with experimental data, with the marked exception of the scalar degrees of freedom, providing an indication that these states may not adhere to the standard quark-antiquark picture of a meson.

  8. Dynamically generated baryon resonances

    CERN Document Server

    Lutz, M F M

    2005-01-01

    Identifying a zero-range exchange of vector mesons as the driving force for the s-wave scattering of pseudo-scalar mesons off the baryon ground states, a rich spectrum of molecules is formed. We argue that chiral symmetry and large-$N_c$ considerations determine that part of the interaction which generates the spectrum. We suggest the existence of strongly bound crypto-exotic baryons, which contain a charm-anti-charm pair. Such states are narrow since they can decay only via OZI-violating processes. A narrow nucleon resonance is found at mass 3.52 GeV. It is a coupled-channel bound state of the $(\\eta_c N), (\\bar D \\Sigma_c)$ system, which decays dominantly into the $(\\eta' N)$ channel. Furthermore two isospin singlet hyperon states at mass 3.23 GeV and 3.58 GeV are observed as a consequence of coupled-channel interactions of the $(\\bar D_s \\Lambda_c), (\\bar D \\Xi_c)$ and $(\\eta_c \\Lambda),(\\bar D \\Xi_c')$ states. Most striking is the small width of about 1 MeV of the lower state. The upper state may be signi...

  9. New Spectroscopy with Charm and Beauty Multiquark States

    CERN Document Server

    Maiani, Luciano

    2015-01-01

    Exotic charmonium and bottonomium resonances recently discovered are discussed and interpreted as diquark-antidiquark states containing a pair of charm quarks and a pair of light, up and down, quarks. Successes, shortcomings and predictions of the model are illustrated.

  10. Evidence for B Semileptonic Decays into the Lambda_c Charm Baryon

    Energy Technology Data Exchange (ETDEWEB)

    Aubert, Bernard; Bona, M.; Karyotakis, Y.; Lees, J.P.; Poireau, V.; Prencipe, E.; Prudent, X.; Tisserand, V.; /Annecy, LAPP; Garra Tico, J.; Grauges, E.; /Barcelona U., ECM; Lopez, L.; Palano, Antimo; Pappagallo, M.; /Bari U. /INFN, Bari; Eigen, G.; Stugu, Bjarne; Sun, L.; /Bergen U.; Abrams, G.S.; Battaglia, M.; Brown, D.N.; Cahn, Robert N.; Jacobsen, R.G.; /LBL, Berkeley /Birmingham U. /Ruhr U., Bochum /Bristol U. /British Columbia U. /Brunel U. /Novosibirsk, IYF /UC, Irvine /UCLA /UC, Riverside /UC, San Diego /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /Ferrara U. /INFN, Ferrara /Frascati /Genoa U. /INFN, Genoa /Harvard U. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa U. /Iowa State U. /Johns Hopkins U. /Orsay, LAL /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /Consorzio Milano Ricerche /INFN, Milan /Mississippi U. /Montreal U. /Mt. Holyoke Coll. /Napoli Seconda U. /INFN, Naples /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U. /Oregon U. /Padua U. /INFN, Padua /Paris U., VI-VII /Pennsylvania U. /Perugia U. /INFN, Perugia /INFN, Pisa /Princeton U. /Banca di Roma /Frascati /Rostock U. /Rutherford /DAPNIA, Saclay /South Carolina U. /SLAC /Stanford U., Phys. Dept. /SUNY, Albany /Tennessee U. /Texas U. /Texas U., Dallas /Turin U. /INFN, Turin /Trieste U. /INFN, Trieste /Valencia U., IFIC /Victoria U. /Warwick U. /Wisconsin U., Madison

    2008-11-05

    We present the first evidence for B semileptonic decays into the charmed baryon {Lambda}{sub c}{sup +} based on 420 fb{sup -1} of data collected at the {Upsilon}(4S) resonance with the BABAR detector at the PEP-II e{sup +}e{sup -} storage rings. Events are tagged by fully reconstructing one of the B mesons in a hadronic decay mode. We measure the relative branching fraction {Beta}({bar B} {yields} {Lambda}{sub c}{sup +} X{ell}{sup -}{bar {nu}}{sub {ell}})/{Beta}({bar B} {yields} {Lambda}{sub c}{sup +}/{bar {Lambda}}{sub c}{sup -}X) = (3.2 {+-} 0.9{sub stat.} {+-} 0.9{sub syst.})%. The significance of the signal including the systematic uncertainty is 4.9 standard deviations.

  11. Exotic meson spectroscopy with CLAS

    Energy Technology Data Exchange (ETDEWEB)

    Adams, G.; Napolitano, J. [Rensselaer Polytechnic Inst., Troy, NY (United States)

    1994-04-01

    The identification and study of mesons with explicit gluonic degrees of freedom will provide major constraints on nonperturbative QCD and models thereof. CLAS will provide a unique opportunity for studying these resonances by measuring photoproduction of multi-meson final states.

  12. Masses of light and heavy mesons in a $U(4)_r \\times U(4)_l$ linear sigma model

    CERN Document Server

    Eshraim, Walaa I

    2014-01-01

    We extend the three-flavor linear sigma model with (axial-)vector mesons to four flavors. We compute the masses of (pseudo)scalar and (axial-)vector mesons including open and hidden charmed mesons as well as weak decay constants. The results are in good agreement with experimental data.

  13. Measurement of charm fragmentation fractions in photoproduction at HERA

    Energy Technology Data Exchange (ETDEWEB)

    Abramowicz, H. [Tel Aviv Univ. (Israel). School of Physics; Max-Planck-Institute for Physics, Munich (Germany); Abt, I. [Max-Planck-Institute for Physics, Muinch (Germany); Adamczyk, L. [AGH-Univ. of Science and Technology, Krakow (Poland). Faculty of Physics and Applied Computer Science] [and others; Collaboration: ZEUS Collaboration

    2013-06-15

    The production of D{sup 0}, D{sup *+}, D{sup +}, D{sub s}{sup +} and {Lambda}{sub c}{sup +} charm hadrons and their antiparticles in ep scattering at HERA has been studied with the ZEUS detector, using a total integrated luminosity of 372 pb{sup -1}. The fractions of charm quarks hadronising into a particular charm hadron were derived. In addition, the ratio of neutral to charged D-meson production rates, the fraction of charged D mesons produced in a vector state, and the strangeness-suppression factor have been determined. The measurements have been performed in the photoproduction regime. The charm hadrons were reconstructed in the range of transverse momentum p{sub T} > 3.8GeV and pseudorapidity vertical stroke {eta} vertical stroke <1.6. The charm fragmentation fractions are compared to previous results from HERA and from e{sup +}e{sup -} experiments. The data support the hypothesis that fragmentation is independent of the production process.

  14. The melting and abundance of open charm hadrons

    Directory of Open Access Journals (Sweden)

    A. Bazavov

    2014-10-01

    Full Text Available Ratios of cumulants of conserved net charge fluctuations are sensitive to the degrees of freedom that are carriers of the corresponding quantum numbers in different phases of strong interaction matter. Using lattice QCD with 2+1 dynamical flavors and quenched charm quarks we calculate second and fourth order cumulants of net charm fluctuations and their correlations with other conserved charges such as net baryon number, electric charge and strangeness. Analyzing appropriate ratios of these cumulants we probe the nature of charmed degrees of freedom in the vicinity of the QCD chiral crossover region. We show that for temperatures above the chiral crossover transition temperature, charmed degrees of freedom can no longer be described by an uncorrelated gas of hadrons. This suggests that the dissociation of open charm hadrons and the emergence of deconfined charm states sets in just near the chiral crossover transition. Till the crossover region we compare these lattice QCD results with two hadron resonance gas models—including only the experimentally established charmed resonances and also including additional states predicted by quark model and lattice QCD calculations. This comparison provides evidence for so far unobserved charmed hadrons that contribute to the thermodynamics in the crossover region.

  15. Open charm and beauty production at HERA

    International Nuclear Information System (INIS)

    Selected new results from the H1 and ZEUS collaborations on ep interactions at 300-318 GeV centre-of-mass energy are presented. The full pre-upgrade integrated luminosity of HERA of 110 pb-1 is used. Charm cross sections are measured up to high values of xB and Q2 and are found to be well described by NLO QCD in the 3 flavour scheme. Orbitally excited D mesons are observed; radial excitations are searched for, but are not seen. The first b cross section measurement is confirmed with a lifetime based method, establishing the excess over NLO QCD. (author)

  16. Open charm and beauty production in hadron reactions

    Energy Technology Data Exchange (ETDEWEB)

    Lykasov, G.I.; Lyubushkin, V.V.; Bednyakov, V.A. [Joint Institute for Nuclear Research, 141980, Dubna, Moscow region (Russian Federation)

    2010-01-15

    The production of charmed and beauty hadrons in proton-proton and proton-antiproton collisions at high energies is analyzed within the modified quark-gluon string model (QGSM) including the internal motion of quarks in colliding hadrons. It is shown that using both the QGSM and NLO QCD one can describe these experimental data rather successfully in a wide region of transverse momenta. We also present some predictions for the future experiments on the beauty baryon production in pp collisions at LHC energies and on the charmed meson production in p-bar p reactions at GSI energies.

  17. Measurement of the inclusive spectra of π0 and η mesons in the energy range of the Υ resonances with the ARGUS detector

    International Nuclear Information System (INIS)

    In the framework of this thesis the inclusive π0 and η spectra from decays of Υ resonances as well as from e+e- events in the continuum at 10.4 GeV were measured. η spectra could for the first time be measured both from gluonic decays of the Υ(1S) meson and from qanti q reactions in the continuum over a wide z range. Both the π0 and the η distribution agree in the framework of their measurement errors well with the predictions of the LUND fragmentation model and the parton shower model of Webber whereby they prefer at high z values the former slightly. From the spectra the production rates of π0 and η mesons in hadronic events were determined. Because especially at η mesons high momenta it can be assumed that they result from primary partons by this differences between the fragmentation of gluons and quarks can be studied. The ratio of the mean η multiplicity in 3-gluon decays to that in continuum events is compatible in the framework of the measurement errors with 1. The same is valid for π0 mesons although this statement has lower weight because those result with essentially lower frequency from the direct fragmentation chain but are more frequently the decay products of heavy hadrons. The measured η multiplicities are in contradiction to a model of the gluon fragmentation of Peterson and Walsh which predicts a drastically increased production of isoscalar neutral particles in gluon jets in comparison to quark jets. This model could by this be distinctly disproved. (orig./HSI)

  18. Hadronic resonances enhanced by thresholds

    CERN Document Server

    Caramés, T F

    2016-01-01

    We present a neat example of a meson--baryon system where the vicinity of two different thresholds enhances the binding of a hadronic resonance, a pentaquark. As a consequence the pattern of states may change when moving among different flavor sectors, what poses a warning on naive extrapolations to heavy flavor sectors based on systematic expansions. For this purpose we simultaneously analyze the $N\\bar D$ and $NB$ two-hadron systems looking for possible bound states or resonances. When a resonance is controlled by a coupled-channel effect, going to a different flavor sector may enhance or diminish the binding. This effect may, for example, generate significant differences between the charmonium and bottomonium spectra above open-flavor thresholds or pentaquark states in the open-charm and open-bottom sectors.

  19. Measurement of Charmed Particle Production in Hadronic Reactions

    CERN Multimedia

    2002-01-01

    The aim of the experiment is to measure the production cross-section for charmed particles in hadronic reactions, study their production mechanism, and search for excited charmed hadrons.\\\\ \\\\ Charmed Mesons and Baryons will be measured in @p and p interactions on Beryllium between 100 and 200 GeV/c. The trigger will be on an electron from the leptonic decay of one charmed particle by signals from the Cerenkov counter (Ce), the electron trigger calorimeter (eCal), scintillation counters, and proportional wire chambers. The accompanying charmed particle will be measured via its hadronic decay in a two-stage magnetic spectrometer with drift chambers (arms 2, 3a, 3b, 3c), two large-area multicell Cerenkov counters (C2, C3) and a large-area shower counter (@g-CAL). The particles which can be measured and identified include @g, e, @p@+, @p|0, K@+, p, @* so that a large number of hadronic decay modes of charmed particles can be studied. \\\\ \\\\ A silicon counter telescope with 5 @mm spatial resolution will measure se...

  20. Exotic nuclei with charm and bottom flavor

    Directory of Open Access Journals (Sweden)

    Yasui S.

    2010-04-01

    Full Text Available We discuss the possibility of existence of exotic nuclei containing charm and bottom mesons. We study the interaction between $ar{D}$ (B mesons and nucleons from view of heavy quark symmetry, and derive the one pion exchange potentials. We apply these potentials to the two body system of $ar{D}$ (B meson and nucleon N , and find there are possible stable bound states with spin JP = 1/2− and isospin I = 0. We find that the tensor interaction mixing $ar{D}$N and $ar{D}$*N (BN and B*N plays an important role. We also qualitatively discuss the possible bound states of $ar{D}$ (B meson and two nucleons.

  1. Charm production in Pb + Pb collisions at energies available at the CERN Large Hadron Collider

    Science.gov (United States)

    Song, Taesoo; Berrehrah, Hamza; Cabrera, Daniel; Cassing, Wolfgang; Bratkovskaya, Elena

    2016-03-01

    We study charm production in Pb +Pb collisions at √{sN N}=2.76 TeV in the parton-hadron-string-dynamics (PHSD) transport approach and the charm dynamics in the partonic and hadronic medium. The charm quarks are produced through initial binary nucleon-nucleon collisions by using the pythia event generator, taking into account the (anti-)shadowing incorporated in the eps09 package. The produced charm quarks interact with off-shell massive partons in the quark-gluon plasma and are hadronized into D mesons through coalescence or fragmentation close to the critical energy density, and then interact with hadrons in the final hadronic stage with scattering cross sections calculated in an effective Lagrangian approach with heavy-quark spin symmetry. The PHSD results show a reasonable RAA and elliptic flow of D mesons in comparison to the experimental data for Pb +Pb collisions at √{sN N}=2.76 TeV from the ALICE Collaboration. We also study the effect of temperature-dependent off-shell charm quarks in relativistic heavy-ion collisions. We find that the scattering cross sections are only moderately affected by off-shell charm degrees of freedom. However, the position of the peak of RAA for D mesons depends on the strength of the scalar partonic forces which also have an impact on the D meson elliptic flow. The comparison with experimental data on the RAA suggests that the repulsive force is weaker for off-shell charm quarks as compared to that for light quarks. Furthermore, the effects from radiative charm energy loss appear to be low compared to the collisional energy loss up to transverse momenta of ˜15 GeV/c .

  2. Exotic meson challenges rules

    International Nuclear Information System (INIS)

    A heavy particle with an unusual decay pattern discovered by the Belle experiment at KEK in Japan is the latest addition to the meson family tree. If we had to name a modern-day Mendeleev, his name would surely be Murray Gell-Mann. In the 1960s, faced with a bewildering array of particles called hadrons that had been turning up in high-energy experiments around the world, Gell-Mann proposed that the particles were combinations of a few fundamental entities called quarks. This idea brought order into the hadronic chaos, a feat for which Gell-Man was awarded the 1969 Nobel Prize for Physics. Ever since the quark model was introduced, physicists have wanted to find out how the six different types of quarks - up (u), down (d), strange (s), charm (c), bottom (b) and top (t) - combine to form the hadrons we observe. The simple hadronic structures that we see are easy to define: mesons such as pions and kaons consist of a quark and an antiquark pair, while baryons such as protons and neutrons are made up of three quarks or three antiquarks. But the theory that describes quarks, quantum chromodynamics (QCD), also permits particles containing four or more quarks. Indeed, a meson can be more generally defined as a hadron that has an integer value of intrinsic angular momentum in quantum units, while baryons have half-integer multiples of spin. Discovering such exotic hadrons, particularly mesons with more than the minimal quark-antiquark structure, would therefore provide crucial information for our understanding of the strong force. In fact, physicists thought they had glimpsed a five-quark state called a 'pentaquark' in 2003. Sadly this excitement looks as if it was misplaced, since the latest results from dedicated experimental searches suggest that pentaquarks are a purely statistical phenomenon (see Physics World May p7: print edition only). (U.K.)

  3. Measurements of prompt charm production cross-sections in $pp$ collisions at $ \\sqrt{s}=13 $ TeV

    OpenAIRE

    Abellán Beteta, Carlos; Adeva, Bernardo; Adinolfi, Marco; Affolder, Anthony; Ajaltouni, Ziad,; Akar, Simon; Albrecht, Johannes; Alessio, Federico; Alexander, Michael; Ali, Suvayu; Alkhazov, Georgy; Alvarez Cartelle, Paula; Alves Jr, Antonio Au; Amato, Sandra; Amerio, Silvia

    2016-01-01

    Production cross-sections of prompt charm mesons are measured with the first data from $pp$ collisions at the LHC at a centre-of-mass energy of $13\\,\\mathrm{TeV}$. The data sample corresponds to an integrated luminosity of $4.98 \\pm 0.19\\,\\mathrm{pb}^{-1}$ collected by the LHCb experiment. The production cross-sections of $D^{0}$, $D^{+}$, $D_{s}^{+}$, and $D^{*+}$ mesons are measured in bins of charm meson transverse momentum, $p_{\\mathrm{T}}$, and rapidity, $y$, and cover the range $0

  4. Hidden-charm molecular pentaquarks and their charm-strange partners

    CERN Document Server

    Chen, Rui; Zhu, Shi-Lin

    2016-01-01

    In the framework of one-pion-exchange (OPE) model, we study the hidden-charm and charm-strange molecular pentauqark systems composed of a heavy baryon $(\\Sigma_c, \\Sigma_c^*)$ and a vector meson $(\\bar{K}^*, \\bar{D}^*)$. We take into account the S-D mixing in our calculation and explain the observed $P_c(4380)$ and $P_c(4450)$ as the $\\Sigma_c\\bar{D}^*$ molecular state with $(I=1/2,J=3/2)$ and the $\\Sigma_c^*\\bar{D}^*$ molecular state with $(I=1/2,J=5/2)$, respectively. Moreover, we predict two other hidden-charm molecular pentaquarks with configurations $\\Sigma_c\\bar{D}^*$ $(I=3/2, J=1/2)$ and $\\Sigma_c^*\\bar{D}^*$ $(I=3/2, J=1/2)$ and two charm-strange molecular pentaquarks $P_{cs}(3340)$ and $P_{cs}(3400)$ corresponding to the $\\Sigma_c\\bar{K}^*$ configuration with $I(J^P)=\\frac{1}{2}(\\frac{3}{2}^-)$ and the $\\Sigma_c^*\\bar{K}^*$ configuration with $I(J^P)=\\frac{1}{2}(\\frac{5}{2}^-)$, respectively. Additionally, we also predict some hidden-bottom $\\Sigma_b^{(*)}B^*$ and $B_c$-like $\\Sigma_c^{(*)}B^*/\\Sigma...

  5. Modelling duality between bound and resonant meson spectra by means of free quantum motions on the de Sitter space time dS4

    CERN Document Server

    Kirchbach, M

    2016-01-01

    We seek for a pair of a well and barrier potentials such that the real parts of the complex energies of the resonances transmitted through the barrier equal the energies of the states bound within the well and find the hyperbolic Poeschl-Teller barrier, ~sech^2\\rho, and the trigonometric Scarf well, ~ \\sec^2\\chi. The potentials are shown to be conformally symmetric by the aid of the de Sitter space time, dS4, related to flat conformal space time by a conformal map. Namely, we transform the quantum mechanical wave equations with the above potentials to free quantum motions on the respective open time like hyperbolic and the closed space like hyper spherical, S3, geodesics of dS4, the former by itself is related to Minkowski space time by a conformal map.We formulate a conformal symmetry respecting classification scheme for mesons seen either as resonances in scattering, or as states bound within a potential, according to trajectories in which the total spin of the meson, l-depends linearly on the first power o...

  6. Masses of heavy-light mesons in Regge phenomenology

    International Nuclear Information System (INIS)

    The masses of some orbitally and radially excited heavy-light mesons are calculated in Regge phenomenology. The results are in reasonable agreement with the experimental data and those given in many other theoretical approaches. Based on the calculation, we suggest that the recently observed D(2550), D(2600) and D(2760) can be assigned as the charmed members of the 21S0, 23S1 and 13D1 multiplets, respectively. Ds*1(2700)± may be assigned as the charm-strange member of the 23S1 state. The results may be helpful in understanding the nature of current and future experimentally observed heavy-light mesons. (authors)

  7. Two-body modes of charm

    International Nuclear Information System (INIS)

    Final state interaction in resonant and exotic channels as well as the annihilation diagrams are necessary tools to obtain a satisfactory description of final states containing 2 pseudo-scalar mesons (PP) or 1 pseudo-scalar and 1 vector mesons (PV).Preliminary results will be presented of the attempts to extend the description to 2 vector mesons (VV) final states. The improved agreement of the updated data with the Cabibbo forbidden final states for PP and PV strongly encourages the continuation of the study. (author)

  8. Two-body modes of charm

    Energy Technology Data Exchange (ETDEWEB)

    Buccella, F. [Univ. Di Montesantangelo Napoli (Italy)

    2002-07-01

    Final state interaction in resonant and exotic channels as well as the annihilation diagrams are necessary tools to obtain a satisfactory description of final states containing 2 pseudo-scalar mesons (PP) or 1 pseudo-scalar and 1 vector mesons (PV).Preliminary results will be presented of the attempts to extend the description to 2 vector mesons (VV) final states. The improved agreement of the updated data with the Cabibbo forbidden final states for PP and PV strongly encourages the continuation of the study. (author)

  9. An investigation of narrow meson resonance production in antiproton-proton and antiproton-neutron interactions at 6.1 and 8.9 GeV/c

    International Nuclear Information System (INIS)

    The authors made a comprehensive search for narrow meson resonance production in reactions of the type p-barN → π+-sub(fast)X and p-barN → psub(fast)(sub(n-bar)sup(p-bar)X at 6.1 and 8.9 GeV.c in a triggered bubble chamber experiment at the SLAC Hybrid Facility. From a study of all accessible inclusive, semi-inclusive and exclusive states, upper limits are given for production of non-strange resonances with width 2. The authors find two further peaks of statistical significance in excess of 4 standard deviations with masses in the M approx. 2 GeV/c2 region, and one further multipion peak with mass approx. 1.54 GeV/c2. (author)

  10. Correlated D-meson decays competing against thermal QGP dilepton radiation

    CERN Document Server

    Lang, Thomas; Steinheimer, Jan; Bleicher, Marcus

    2013-01-01

    The QGP that might be created in ultrarelativistic heavy-ion collisions is expected to radiate thermal dilepton radiation. However, this thermal dilepton radiation interferes with dileptons originating from hadron decays. In the invariant mass region between the $\\phi$ and $J/\\Psi$ peak ($1\\,$GeV$\\lesssim M_{\\ell^+ \\ell^-} \\lesssim 3 \\,$GeV) the most substantial background of hadron decays originates from correlated D$\\bar{\\mathrm{D}}$-meson decays. We evaluate this background using a Langevin simulation for charm quarks. As background medium we utilize the well-tested UrQMD-hybrid model. The required drag and diffusion coefficients are taken from a resonance approach. The decoupling of the charm quarks from the hot medium is performed at a temperature of $130\\,$MeV and as hadronization mechanism a coalescence approach is chosen. This model for charm quark interactions with the medium has already been successfully applied to the study of the medium modification and the elliptic flow at FAIR, RHIC and LHC ener...

  11. Measurement of |Vcb| through exclusive semileptonic B → DIν decays with a tagged fully reconstructed B meson at the Belle experiment

    International Nuclear Information System (INIS)

    Full text: The weak transition of quarks into each other is determined by the CKM matrix. In order to measure the entry Vcb, which governs decays of bottom quarks to charm quarks, we study the decay B → Dlν (l = e, μ) at the Y(4S) resonance at the Belle experiment. Y(4S), being only slightly above two masses of B, grants high numbers of events with B meson pairs. To highly reduce the background of our study we reconstruct not only the signal, but the second B as well. Through a fit of the decay rate for different kinematic regions we determine |Vcb|. (author)

  12. Charm mixing in the framework of HQE

    Energy Technology Data Exchange (ETDEWEB)

    Bobrowski, Markus; Lenz, Alexander [Universitaet Regensburg (Germany)

    2010-07-01

    In this talk we issue the quark-level analysis of meson-antimeson mixing in the charm system. Although a naive application of the heavy-quark-expansion (HQE) approach to D{sup 0} mesons fails to reproduce the experimental width differences by orders of magnitude, we argue that currently there seem to be no indications for a complete breakdown of HQE-based techniques in the leading dimensions 6 and 7. The smallness of current quark-level based theory predictions can be understood as a result of efficient GIM interference between numerically rather large diagrams; any mechanism, which helps to lift this suppression, could possibly serve as a solution to this problem: This may be new physics modifications of CKM couplings or enhancement of SU(3){sub F} symmetry breaking. Within the Standard Model, GIM lifting is sometimes supposed to come along with the cutting of internal quark loops in dimension 9 and 12 of the HQE. Reliable results for the quark-level expectation could finally provide a test of quark-hadron duality in the charm sector.

  13. Charm production in antiproton-proton annihilation

    CERN Document Server

    Haidenbauer, J

    2010-01-01

    We study the production of charmed mesons (D) and baryons (Lambda_c) in antiproton-proton (app) annihilation close to their respective production thresholds. The elementary charm production process is described by either baryon/meson exchange or by quark/gluon dynamics. Effects of the interactions in the initial and final states are taken into account rigorously. The calculations are performed in close analogy to our earlier study on app -> antiLambda-Lambda and app -> antiK-K by connecting the processes via SU(4) flavor symmetry. Our predictions for the antiLambda_c-Lambda_c production cross section are in the order of 1 to 7 mb, i.e. a factor of around 10-70 smaller than the corresponding cross sections for antiLambda-Lambda However, they are 100 to 1000 times larger than predictions of other model calculations in the literature. On the other hand, the resulting cross sections for antiD-D production are found to be in the order of 10^{-2} -- 10^{-1} microbarn and they turned out to be comparable to those ob...

  14. $B$ flavour tagging using charm decays at the LHCb experiment

    CERN Document Server

    Aaij, Roel; Adinolfi, Marco; Affolder, Anthony; Ajaltouni, Ziad; Akar, Simon; Albrecht, Johannes; Alessio, Federico; Alexander, Michael; Ali, Suvayu; Alkhazov, Georgy; Alvarez Cartelle, Paula; Alves Jr, Antonio Augusto; Amato, Sandra; Amerio, Silvia; Amhis, Yasmine; An, Liupan; Anderlini, Lucio; Anderson, Jonathan; Andreassi, Guido; Andreotti, Mirco; Andrews, Jason; Appleby, Robert; Aquines Gutierrez, Osvaldo; Archilli, Flavio; d'Argent, Philippe; Artamonov, Alexander; Artuso, Marina; Aslanides, Elie; Auriemma, Giulio; Baalouch, Marouen; Bachmann, Sebastian; Back, John; Badalov, Alexey; Baesso, Clarissa; Baldini, Wander; Barlow, Roger; Barschel, Colin; Barsuk, Sergey; Barter, William; Batozskaya, Varvara; Battista, Vincenzo; Bay, Aurelio; Beaucourt, Leo; Beddow, John; Bedeschi, Franco; Bediaga, Ignacio; Bel, Lennaert; Bellee, Violaine; Belloli, Nicoletta; Belyaev, Ivan; Ben-Haim, Eli; Bencivenni, Giovanni; Benson, Sean; Benton, Jack; Berezhnoy, Alexander; Bernet, Roland; Bertolin, Alessandro; Bettler, Marc-Olivier; van Beuzekom, Martinus; Bien, Alexander; Bifani, Simone; Billoir, Pierre; Bird, Thomas; Birnkraut, Alex; Bizzeti, Andrea; Blake, Thomas; Blanc, Frédéric; Blouw, Johan; Blusk, Steven; Bocci, Valerio; Bondar, Alexander; Bondar, Nikolay; Bonivento, Walter; Borghi, Silvia; Borsato, Martino; Bowcock, Themistocles; Bowen, Espen Eie; Bozzi, Concezio; Braun, Svende; Britsch, Markward; Britton, Thomas; Brodzicka, Jolanta; Brook, Nicholas; Buchanan, Emma; Bursche, Albert; Buytaert, Jan; Cadeddu, Sandro; Calabrese, Roberto; Calvi, Marta; Calvo Gomez, Miriam; Campana, Pierluigi; Campora Perez, Daniel; Capriotti, Lorenzo; Carbone, Angelo; Carboni, Giovanni; Cardinale, Roberta; Cardini, Alessandro; Carniti, Paolo; Carson, Laurence; Carvalho Akiba, Kazuyoshi; Casse, Gianluigi; Cassina, Lorenzo; Castillo Garcia, Lucia; Cattaneo, Marco; Cauet, Christophe; Cavallero, Giovanni; Cenci, Riccardo; Charles, Matthew; Charpentier, Philippe; Chefdeville, Maximilien; Chen, Shanzhen; Cheung, Shu-Faye; Chiapolini, Nicola; Chrzaszcz, Marcin; Cid Vidal, Xabier; Ciezarek, Gregory; Clarke, Peter; Clemencic, Marco; Cliff, Harry; Closier, Joel; Coco, Victor; Cogan, Julien; Cogneras, Eric; Cogoni, Violetta; Cojocariu, Lucian; Collazuol, Gianmaria; Collins, Paula; Comerma-Montells, Albert; Contu, Andrea; Cook, Andrew; Coombes, Matthew; Coquereau, Samuel; Corti, Gloria; Corvo, Marco; Couturier, Benjamin; Cowan, Greig; Craik, Daniel Charles; Crocombe, Andrew; Cruz Torres, Melissa Maria; Cunliffe, Samuel; Currie, Robert; D'Ambrosio, Carmelo; Dall'Occo, Elena; Dalseno, Jeremy; David, Pieter; Davis, Adam; De Bruyn, Kristof; De Capua, Stefano; De Cian, Michel; De Miranda, Jussara; De Paula, Leandro; De Simone, Patrizia; Dean, Cameron Thomas; Decamp, Daniel; Deckenhoff, Mirko; Del Buono, Luigi; Déléage, Nicolas; Demmer, Moritz; Derkach, Denis; Deschamps, Olivier; Dettori, Francesco; Dey, Biplab; Di Canto, Angelo; Di Ruscio, Francesco; Dijkstra, Hans; Donleavy, Stephanie; Dordei, Francesca; Dorigo, Mirco; Dosil Suárez, Alvaro; Dossett, David; Dovbnya, Anatoliy; Dreimanis, Karlis; Dufour, Laurent; Dujany, Giulio; Dupertuis, Frederic; Durante, Paolo; Dzhelyadin, Rustem; Dziurda, Agnieszka; Dzyuba, Alexey; Easo, Sajan; Egede, Ulrik; Egorychev, Victor; Eidelman, Semen; Eisenhardt, Stephan; Eitschberger, Ulrich; Ekelhof, Robert; Eklund, Lars; El Rifai, Ibrahim; Elsasser, Christian; Ely, Scott; Esen, Sevda; Evans, Hannah Mary; Evans, Timothy; Falabella, Antonio; Färber, Christian; Farinelli, Chiara; Farley, Nathanael; Farry, Stephen; Fay, Robert; Ferguson, Dianne; Fernandez Albor, Victor; Ferrari, Fabio; Ferreira Rodrigues, Fernando; Ferro-Luzzi, Massimiliano; Filippov, Sergey; Fiore, Marco; Fiorini, Massimiliano; Firlej, Miroslaw; Fitzpatrick, Conor; Fiutowski, Tomasz; Fohl, Klaus; Fol, Philip; Fontana, Marianna; Fontanelli, Flavio; Forty, Roger; Francisco, Oscar; Frank, Markus; Frei, Christoph; Frosini, Maddalena; Fu, Jinlin; Furfaro, Emiliano; Gallas Torreira, Abraham; Galli, Domenico; Gallorini, Stefano; Gambetta, Silvia; Gandelman, Miriam; Gandini, Paolo; Gao, Yuanning; García Pardiñas, Julián; Garra Tico, Jordi; Garrido, Lluis; Gascon, David; Gaspar, Clara; Gauld, Rhorry; Gavardi, Laura; Gazzoni, Giulio; Gerick, David; Gersabeck, Evelina; Gersabeck, Marco; Gershon, Timothy; Ghez, Philippe; Gianelle, Alessio; Gianì, Sebastiana; Gibson, Valerie; Girard, Olivier Göran; Giubega, Lavinia-Helena; Gligorov, Vladimir; Göbel, Carla; Golubkov, Dmitry; Golutvin, Andrey; Gomes, Alvaro; Gotti, Claudio; Grabalosa Gándara, Marc; Graciani Diaz, Ricardo

    2015-01-01

    An algorithm is described for tagging the flavour content at production of neutral $B$ mesons in the LHCb experiment. The algorithm exploits the correlation of the flavour of a $B$ meson with the charge of a reconstructed secondary charm hadron from the decay of the other $b$ hadron produced in the proton-proton collision. Charm hadron candidates are identified in a number of fully or partially reconstructed Cabibbo-favoured decay modes. The algorithm is calibrated on the self-tagged decay modes $B^+ \\to J/\\psi \\, K^+$ and $B^0 \\to J/\\psi \\, K^{*0}$ using $3.0\\mathrm{\\,fb}^{-1}$ of data collected by the LHCb experiment at $pp$ centre-of-mass energies of $7\\mathrm{\\,TeV}$ and $8\\mathrm{\\,TeV}$. Its tagging power on these samples of $B \\to J/\\psi \\, X$ decays is $(0.30 \\pm 0.01 \\pm 0.01) \\%$.

  15. A measurement of the charmed quark asymmetry in e sup + e sup - annihilation

    Energy Technology Data Exchange (ETDEWEB)

    Ould-Saada, F.; Greenshaw, T.; Hagemann, J.; Heinzelmann, G.; Kleinwort, C.; Kuhlen, M.; Schneekloth, U.; Warming, P.; Weber, G. (Hamburg Univ. (Germany, F.R.). 2. Inst. fuer Experimentalphysik); Allison, J.; Barlow, R.J.; Chrin, J.; Duerdoth, I.P.; Loebinger, F.K.; Macbeth, A.A.; Murphy, P.G.; Stephens, K. (Manchester Univ. (UK)); Ambrus, K.; Bethke, S.; Dieckmann, A.; Eckerlin, G.; Elsen, E.; Heintze, J.; Hellenbrand, K.H.; Komamiya, S.; Krogh, J. von; Rieseberg, H.; Smolik, L.; Spitzer, J.; Wagner, A.; Zimmer, M. (Heidelberg Univ. (Germany, F.R.). Physikalisches Inst.); Bartel, W.; Felst, R.; Haidt, D.; Hill, P.; Kado, H.; Knies, G.; Krehbiel, H.; Magnussen, N.; Meinke, R.; Naroska, B.; Olsson, J.; Ramcke, R.; Schmidt, D.; Steffen, P. (Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany, F.R.)); Bowdery, C.K.; Finch, A.J.; Foster, F.; Hughes, G.; Nye, J.M.; Walker, I.W. (Lancaster Univ. (UK)); Cartwright, S.L.; Clarke, D.; Marshall, R.; Middleton, R.P. (Rutherford Appleto; JADE Collaboration

    1989-11-01

    The charmed quark charge asymmetry has been measured at the average centre of mass energy of 35 GeV with the JADE detector at the e{sup +}e{sup -} storage ring PETRA. Charmed quarks were identified by D{sup *+-} tagging using the {Delta}M technique. D{sup *+-} mesons were reconstructed through their decay into D{sup 0} mesons resulting in (K{pi}){pi} and (K{pi}{pi}{pi}){pi} final states. The measured charge asymmetry A=-0.149+-0.067 is in agreement with the expectation from the electroweak interference effect in quantum flavour dynamics (QFD). (orig.).

  16. New results on CLEO's heavy quarks - bottom and charm

    International Nuclear Information System (INIS)

    While the top quark is confined to virtual reality for CLEO, the increased luminosity of the Cornell Electron Storage Ring (CESR) and the improved photon detection capabilities of the CLEO's open-quotes heavyclose quotes quarks - bottom and charm. I will describe new results in the B meson sector including the first observation of exclusive b → ulv decays, upper limits on gluonic penguin decay rates, and precise measurements of semileptonic and hadronic b → c branching fractions. The charmed hadron results that are discussed include the observation of isospin violation in Ds*+ decays, an update on measurements of the Ds+ decay constant, and the observation of a new excited Ξc charmed baryon. These measurements have had a large impact on our understanding of heavy quark physics

  17. Measurement of the D*± meson cross section and extraction of the charm contribution, Fc2(x, Q2), to the proton structure in deep inelastic ep scattering with the H1 detector at HERA

    International Nuclear Information System (INIS)

    Inclusive production of D* mesons in deep inelastic scattering at HERA is studied using data taken with the H1 detector in the years 2004 to 2007 corresponding to an integrated luminosity of 347 pb-1. The measurement covers the region 522 in photon virtuality and the increased region 0.02* meson is restricted in transverse momentum and pseudorapidity to pT(D*)>1.5 GeV and vertical stroke η(D*) vertical stroke c2 (x,Q2), to the proton structure in different QCD evolution schemes is derived from the D* cross sections and compared to next-to-leading order perturbative QCD predictions. This Fc2 measurement is performed using a factor of 18 more data compared to the previous H1 publication. The present thesis additionally describes a successfully completed hardware project: The commissioning and optimisation of the third level of the H1 Fast Track Trigger (FTT), which was fully operational from 2006 onwards. The FTT is integrated in the first three levels of the H1 trigger system and provides enhanced selectivity for events with charged particles. The third trigger level of the FTT performs a track-based event reconstruction within a latency of about 100 μs. The third trigger level of the FTT is realised by a farm of PowerPC boards. Furthermore, the FTT simulation is now incorporated into the H1 trigger simulation. (orig.)

  18. Effect of quark gluon plasma on charm quark produced in relativistic heavy ion collision

    International Nuclear Information System (INIS)

    Charm quarks are produced mainly in the pre-equilibrium stage of heavy ion collision and serve as excellent probes entering the thermalized medium. They come out with altogether different momenta and energies and fragments into D-mesons and decay into non-photonic electrons which are observed experimentally. Here we present the effect of QGP on charm quark production using two different models: first one based on Wang-Huang-Sarcevic model of multiple scattering of partons and the second one is based on Parton Cascade Model with Boltzmann transport equation used for charm quark evolution in QGP

  19. Beauty and charm production from Fermilab experiment 789

    International Nuclear Information System (INIS)

    Experiment 789 is a fixed-target experiment at Fermilab designed to study low-multiplicity decays of charm and beauty. During the 1991 run. E789 collected ∼ 109 events using an 800 GeV proton beam incident upon gold and beryllium targets. Analyses of these data include searches for b → J/ψ+Χ decays and Α- dependence measurements of neutral D meson production. Preliminary results from the 1991 run are presented in this paper

  20. Penta-quark states with hidden charm and beauty

    CERN Document Server

    Zou, Bing-Song

    2011-01-01

    More and more hadron states are found to be difficult to be accommodated by the quenched quark models which describe baryons as 3-quark states and mesons as antiquark-quark states. Dragging out an antiquark-quark pair from the gluon field in hadrons should be an important excitation mechanism for hadron spectroscopy. Our recent progress on the penta-quark states with hidden charm and beauty is reviewed.

  1. Sub-threshold charm production in nuclear collisions

    CERN Document Server

    Steinheimer, J; Bleicher, M

    2016-01-01

    We present the first predictions for sub-threshold open charm and charmonium production in nuclear collisions. The production mechanism is driven by multi-step scatterings of nucleons and their resonance states, accumulating sufficient energy for the production of $J/\\Psi$ and $\\Lambda_c + \\bar{D}$. Our results are of particular importance for the CBM experiment at FAIR, as they indicate that already at the SIS100 accelerator one can expect a significant number of charmed hadrons to be produced. This opens new possibilities to explore chram dynamics and the formation of charm (super-) nuclei.

  2. CP violation searches in the charm sector at LHCb

    CERN Document Server

    CERN. Geneva

    2016-01-01

    LHCb has collected the world's largest sample of charmed hadrons, thus enabling measurements of direct and indirect CP violation parameters of D^0 mesons to be made with unprecedented precision. The difference in CP asymmetries between the singly Cabibbo-suppressed (SCS) D^0 -> K+K- and D^0 -> pi+pi- decays (Delta A_CP) has emerged as a powerful observable to search for direct CPV in the charm sector. By taking the difference between the two modes, most of the asymmetries induced by the detector or coming from the production mechanism are cancelled. The measurement of Delta A_CP done at LHCb is the most precise measurement of a time-integrated CP asymmetry in the charm sector from a single experiment, with a precision reaching the sub-permille level. Two independent measurements of Delta A_CP based on complementary data sets will be presented. Related 2-body searches and searches for direct CP violation in multi-body decays of the D^0 mesons will be discussed. Indirect CP violation in charm is measured throug...

  3. Bottom-strange mesons in hyperonic matter

    CERN Document Server

    Pathak, Divakar

    2014-01-01

    The in-medium behavior of bottom-strange pseudoscalar mesons in hot, isospin asymmetric and dense hadronic environment is studied using a chiral effective model. The same was recently generalized to the heavy quark sector and employed to study the behavior of open-charm and open-bottom mesons. The heavy quark (anti-quark) is treated as frozen and all medium modifications of these bottom-strange mesons are due to their strange anti-quark (quark) content. We observe a pronounced dependence of their medium mass on baryonic density and strangeness content of the medium. Certain aspects of these in-medium interactions are similar to those observed for the strange-charmed mesons in a preceding investigation, such as the lifting of mass-degeneracy of $B_S^0$ and ${\\bar B}_S^0$ mesons in hyperonic matter, while the same is respected in vacuum as well as in nuclear matter. In general, however, there is a remarkable distinction between the two species, even though the formalism predicts a completely analogous in-medium...

  4. Unraveling the pattern of the $XYZ$ mesons

    CERN Document Server

    Vijande, J

    2015-01-01

    We present a plausible mechanism for the origin of the $XYZ$ mesons in the heavy meson spectra within a standard quark-model picture. We discuss the conditions required for the existence of four--quark bound states or resonances contributing to the heavy meson spectra, being either compact or molecular. We concentrate on charmonium and bottomonium spectra, where several new states, difficult to understand as simple quark-antiquark pairs, have been reported by different experimental collaborations. The pivotal role played by entangled meson-meson thresholds is emphasized.

  5. First Observation of Inclusive B Decays to the Charmed Strange Baryons Ξ0c and Ξ+c

    International Nuclear Information System (INIS)

    Using data collected in the region of the Υ(4S) resonance with the CLEO II detector operating at the Cornell Electron Storage Ring (CESR), we present the first observation of B mesons decaying into the charmed strange baryons Ξ0c and Ξ+c . We find 79±27 Ξ0c and 125±28 Ξ+c candidates from B decays, leading to product branching fractions of B(bar B→Ξ0cX)B(Ξ0c→Ξ-π+)= (0.144±0.048 ±0.021) x10-3 and B(bar B→Ξ+cX)B(Ξ+C→ Ξ-π+π+) =(0.453± 0.096+0.085-0.065)x 10-3 . copyright 1997 The American Physical Society

  6. ...tau and charm

    International Nuclear Information System (INIS)

    The Standard Model of particle physics has six quarks, grouped in three pairs (up/down, charm/strange, top/beauty), each pair being partnered with a lepton and its corresponding neutrino - respectively electron, muon, and tau. Probing the Standard Model in depth to see what makes it work means peering into all quark/lepton corners. While B physics, with its potential at proton and electron-positron machines, is being pushed hard (see previous article), other physicists underline the need for complementary information from other sectors. Essential experimental tools for exploring out-of-the-ordinary particles are a Tau-Charm Factory and a Beauty Factory. These machines address similar basic questions in the Standard Model, but in complementary ways: the Beauty Factory is optimized for beauty particles and CP violation in B decays; and the TCF is optimized for the tau lepton, charm particles, and the spectroscopy of hidden charm states and light hadrons. In early June about 100 physicists - theorists, experimentalists and accelerator physicists - from Europe and beyond gathered in Marbella, Spain, for the 3rd Workshop on the Tau-Charm Factory (TCF). The workshop aimed to reassess the TCF physics potential in the light of recent progress, to develop further the designs of the machine and the detector, and to discuss the experimental programme

  7. Photographic emulsion versus bubble chambers in charm and beauty searches

    International Nuclear Information System (INIS)

    This chapter discusses the use of visual detectors in the search for charm and other flavors. The photographic emulsion and the bubble chamber techniques are compared. The main difficulties encounted in searching for charmed and beautiful hadrons are related to the short lifetimes of these particles and to their small production cross-sections, even at SPS energies. Resolution, visibility, the data analysis rate, and exposure time are considered. Most of the charmed hadrons present a large variety of decay modes of which only a fraction has been identified to date. First results from CESR indicate that the average charged particle multiplicity in the hadronic decay of beautiful hadrons is as high as 6.31 + or - 0.35; no B meson decay has yet been kinematically reconstructed. The case of hadronic charmed particle production at SPS energies is examined. The data show that 1) the bubble chamber technique (high resolution or holographic optics) is well suited to the study of charmed hadrons with lifetimes in the range 10-13 to 10-12 s; 2) searches for beautiful hadrons remain presently a domain for triggered emulsion experiments due to the smallness of the production cross-sections (provided the lifetime is not much shorter than 10-14 s); and 3) for particles of lifetimes shorter than a few times 10-14 s the emulsion technique is still without competitor

  8. Measurement of the D{sup *{+-}} meson cross section and extraction of the charm contribution, F{sup c}{sub 2}(x, Q{sup 2}), to the proton structure in deep inelastic ep scattering with the H1 detector at HERA

    Energy Technology Data Exchange (ETDEWEB)

    Jung, Andreas Werner

    2009-01-15

    Inclusive production of D{sup *} mesons in deep inelastic scattering at HERA is studied using data taken with the H1 detector in the years 2004 to 2007 corresponding to an integrated luminosity of 347 pb{sup -1}. The measurement covers the region 5meson is restricted in transverse momentum and pseudorapidity to p{sub T}(D{sup *})>1.5 GeV and vertical stroke {eta}(D{sup *}) vertical stroke < 1.5. The present measurement is based on an eightfold increased statistics compared to the previous H1 publication and provides a significantly reduced systematic error. Single and double-differential cross sections are compared to leading and next-to-leading order perturbative QCD predictions. The charm contribution, F{sup c}{sub 2} (x,Q{sup 2}), to the proton structure in different QCD evolution schemes is derived from the D{sup *} cross sections and compared to next-to-leading order perturbative QCD predictions. This F{sup c}{sub 2} measurement is performed using a factor of 18 more data compared to the previous H1 publication. The present thesis additionally describes a successfully completed hardware project: The commissioning and optimisation of the third level of the H1 Fast Track Trigger (FTT), which was fully operational from 2006 onwards. The FTT is integrated in the first three levels of the H1 trigger system and provides enhanced selectivity for events with charged particles. The third trigger level of the FTT performs a track-based event reconstruction within a latency of about 100 {mu}s. The third trigger level of the FTT is realised by a farm of PowerPC boards. Furthermore, the FTT simulation is now incorporated into the H1 trigger simulation. (orig.)

  9. Charmed Bottom Baryon Spectroscopy

    Energy Technology Data Exchange (ETDEWEB)

    Brown, Zachary S; Detmold, William; Meinel, Stefan; Orginos, Kostas

    2014-11-01

    The spectrum of doubly and triply heavy baryons remains experimentally unexplored to a large extent. Although the detection of such heavy particle states may lie beyond the reach of exper- iments for some time, it is interesting compute this spectrum from QCD and compare results between lattice calculations and continuum theoretical models. Several lattice calculations ex- ist for both doubly and triply charmed as well as doubly and triply bottom baryons. Here, we present preliminary results from the first lattice calculation of doubly and triply heavy baryons including both charm and bottom quarks. We use domain wall fermions for 2+1 flavors (up down and strange) of sea and valence quarks, a relativistic heavy quark action for the charm quarks, and non-relativistic QCD for the heavier bottom quarks. We present preliminary results for the ground state spectrum.

  10. Resonance catalyzed CP asymmetries in D --> P l+ l-

    CERN Document Server

    Fajfer, Svjetlana

    2012-01-01

    Recently observed increase of direct CP asymmetry in charm meson nonleptonic decays is difficult to explain within the SM. If this effect is induced by new physics, this might be investigated in other charm processes. We propose to investigate new CP violating effects in rare decays $D \\to P \\ell^+ \\ell^-$, which arise due to the interference of resonant part of the long distance contribution and the new physics affected short distance contribution. Performing a model independent analysis, we identify as appropriate observables the differential direct CP asymmetry and partial decay width CP asymmetry. We find that in the most promising decays $D^+ \\to \\pi^+ \\ell^+ \\ell^-$ and $D_s^+ \\to K^+ \\ell^+ \\ell^-$ the "peak-symmetric" and "peak-antisymmetric" CP asymmetries are strong phase dependent and can be of the order 1 % and 10 %, respectively.

  11. Test input of radio-frequency power into the resonator mockup to the second part of the linear accelerator of a meson factory

    International Nuclear Information System (INIS)

    On the experimental stand of the Radio Engineering Institute of the Academy of Sciences of the USSR the accelerating structures for the second portion of the ''meson factory'' are researched. The test power input into the models of of the accelerating structures is accomplished from a powerful pulse klystron generator with external excitation and operating frequency of 991 MHz. The pulse duration of 140 μ s can be diminished as required during ageing of the resonator. The power is adjusted within wide limits. The wave-guide feeders measuring 220 104 terminate in the can-type sealing ports incorporating fused quartz discs and matching diaphragms. The standing wave coefficient in the feeder does not exceed 1.4. The temperature of the cooling water at the resonator input is kept stable. Under nominal conditions the average intensity of the electric field on the axis is 36 kV/cm, the pulse power of the r-f losses in the resonator is equal to 0.9 MW, the average power amounts to 11 kW

  12. $\\pi$ and $\\pi\\pi$ Decays of Excited D Mesons

    CERN Document Server

    Lähde, T A

    2002-01-01

    The $\\pi$ and $\\pi\\pi$ decay widths of the excited charm mesons are calculated using a Hamiltonian model within the framework of the covariant Blankenbecler-Sugar equation. The pion-light constituent quark coupling is described by the chiral pseudovector Lagrangian.

  13. Pi and PiPi Decays of Excited D Mesons

    OpenAIRE

    Lahde, T. A.; Riska, D. O.

    2001-01-01

    The $\\pi$ and $\\pi\\pi$ decay widths of the excited charm mesons are calculated using a Hamiltonian model within the framework of the covariant Blankenbecler-Sugar equation. The pion-light constituent quark coupling is described by the chiral pseudovector Lagrangian.

  14. Charm production in SIBYLL

    Directory of Open Access Journals (Sweden)

    Riehn F.

    2015-01-01

    Full Text Available SIBYLL 2.1 is an event generator for hadron interactions at the highest energies. It is commonly used to analyze and interpret extensive air shower measurements. In light of the first detection of PeV neutrinos by the IceCube collaboration the inclusive fluxes of muons and neutrinos in the atmosphere have become very important. Predicting these fluxes requires understanding of the hadronic production of charmed particles since these contribute significantly to the fluxes at high energy through their prompt decay. We will present an updated version of SIBYLL that has been tuned to describe LHC data and extended to include the production of charmed hadrons.

  15. A time-dependent measurement of charm CP violation at LHCb

    CERN Multimedia

    Smith, M

    2014-01-01

    A time dependent analysis of CP violation in charm mesons is presented through the measurement of the observable $A_{\\Gamma}$. This observable involves precise measurements of the D0 lifetime as it decays to a CP eigenstate. The results presented are the most precise to date. No CP violation is observed.

  16. Status of the Tau-Charm Facility and highlights of its physics program

    International Nuclear Information System (INIS)

    In this paper I will first discuss the history and current status of the Tau-Charm Facility. I will then focus on the unique aspects of the heavy meson and tau physics program of such a facility, which motivates its construction and operation in the mid-1090's

  17. Measurement of the Semileptonic Branching Ratio of Charm Hadrons Produced in $Z^{0} \\to c\\bar{c}$ Decays

    CERN Document Server

    Abbiendi, G; Alexander, Gideon; Allison, J; Altekamp, N; Anderson, K J; Anderson, S; Arcelli, S; Asai, S; Ashby, S F; Axen, D A; Azuelos, Georges; Ball, A H; Barberio, E; Barlow, R J; Bartoldus, R; Batley, J Richard; Baumann, S; Bechtluft, J; Behnke, T; Bell, K W; Bella, G; Bellerive, A; Bentvelsen, Stanislaus Cornelius Maria; Bethke, Siegfried; Betts, S; Biebel, O; Biguzzi, A; Bird, S D; Blobel, Volker; Bloodworth, Ian J; Bobinski, M; Bock, P; Böhme, J; Bonacorsi, D; Boutemeur, M; Braibant, S; Bright-Thomas, P G; Brigliadori, L; Brown, R M; Burckhart, Helfried J; Burgard, C; Bürgin, R; Capiluppi, P; Carnegie, R K; Carter, A A; Carter, J R; Chang, C Y; Charlton, D G; Chrisman, D; Ciocca, C; Clarke, P E L; Clay, E; Cohen, I; Conboy, J E; Cooke, O C; Couyoumtzelis, C; Coxe, R L; Cuffiani, M; Dado, S; Dallavalle, G M; Davis, R; De Jong, S; del Pozo, L A; de Roeck, A; Desch, Klaus; Dienes, B; Dixit, M S; Dubbert, J; Duchovni, E; Duckeck, G; Duerdoth, I P; Eatough, D; Estabrooks, P G; Etzion, E; Evans, H G; Fabbri, Franco Luigi; Fanti, M; Faust, A A; Fiedler, F; Fierro, M; Fleck, I; Folman, R; Fürtjes, A; Futyan, D I; Gagnon, P; Gary, J W; Gascon, J; Gascon-Shotkin, S M; Gaycken, G; Geich-Gimbel, C; Giacomelli, G; Giacomelli, P; Gibson, V; Gibson, W R; Gingrich, D M; Glenzinski, D A; Goldberg, J; Gorn, W; Grandi, C; Gross, E; Grunhaus, Jacob; Gruwé, M; Hanson, G G; Hansroul, M; Hapke, M; Harder, K; Hargrove, C K; Hartmann, C; Hauschild, M; Hawkes, C M; Hawkings, R; Hemingway, Richard J; Herndon, M; Herten, G; Heuer, R D; Hildreth, M D; Hill, J C; Hillier, S J; Hobson, P R; Höcker, Andreas; Homer, R James; Honma, A K; Horváth, D; Hossain, K R; Howard, R; Hüntemeyer, P; Igo-Kemenes, P; Imrie, D C; Ishii, K; Jacob, F R; Jawahery, A; Jeremie, H; Jimack, Martin Paul; Jones, C R; Jovanovic, P; Junk, T R; Karlen, D A; Kartvelishvili, V G; Kawagoe, K; Kawamoto, T; Kayal, P I; Keeler, Richard K; Kellogg, R G; Kennedy, B W; Klier, A; Kluth, S; Kobayashi, T; Kobel, M; Koetke, D S; Kokott, T P; Kolrep, M; Komamiya, S; Kowalewski, R V; Kress, T; Krieger, P; Von Krogh, J; Kühl, T; Kyberd, P; Lafferty, G D; Lanske, D; Lauber, J; Lautenschlager, S R; Lawson, I; Layter, J G; Lazic, D; Lee, A M; Lellouch, Daniel; Letts, J; Levinson, L; Liebisch, R; List, B; Littlewood, C; Lloyd, A W; Lloyd, S L; Loebinger, F K; Long, G D; Losty, Michael J; Ludwig, J; Liu, D; Macchiolo, A; MacPherson, A L; Mader, W F; Mannelli, M; Marcellini, S; Markopoulos, C; Martin, A J; Martin, J P; Martínez, G; Mashimo, T; Mättig, P; McDonald, W J; McKenna, J A; McKigney, E A; McMahon, T J; McPherson, R A; Meijers, F; Menke, S; Merritt, F S; Mes, H; Meyer, J; Michelini, Aldo; Mihara, S; Mikenberg, G; Miller, D J; Mir, R; Mohr, W; Montanari, A; Mori, T; Nagai, K; Nakamura, I; Neal, H A; Nellen, B; Nisius, R; O'Neale, S W; Oakham, F G; Odorici, F; Ögren, H O; Oreglia, M J; Orito, S; Pálinkás, J; Pásztor, G; Pater, J R; Patrick, G N; Patt, J; Pérez-Ochoa, R; Petzold, S; Pfeifenschneider, P; Pilcher, J E; Pinfold, James L; Plane, D E; Poffenberger, P R; Polok, J; Przybycien, M B; Rembser, C; Rick, Hartmut; Robertson, S; Robins, S A; Rodning, N L; Roney, J M; Roscoe, K; Rossi, A M; Rozen, Y; Runge, K; Runólfsson, O; Rust, D R; Sachs, K; Saeki, T; Sahr, O; Sang, W M; Sarkisyan-Grinbaum, E; Sbarra, C; Schaile, A D; Schaile, O; Scharf, F; Scharff-Hansen, P; Schieck, J; Schmitt, B; Schmitt, S; Schöning, A; Schröder, M; Schumacher, M; Schwick, C; Scott, W G; Seuster, R; Shears, T G; Shen, B C; Shepherd-Themistocleous, C H; Sherwood, P; Siroli, G P; Sittler, A; Skuja, A; Smith, A M; Snow, G A; Sobie, Randall J; Söldner-Rembold, S; Sproston, M; Stahl, A; Stephens, K; Steuerer, J; Stoll, K; Strom, D; Ströhmer, R; Surrow, B; Talbot, S D; Tanaka, S; Taras, P; Tarem, S; Teuscher, R; Thiergen, M; Thomson, M A; Von Törne, E; Torrence, E; Towers, S; Trigger, I; Trócsányi, Z L; Tsur, E; Turcot, A S; Turner-Watson, M F; Van Kooten, R; Vannerem, P; Verzocchi, M; Voss, H; Wäckerle, F; Wagner, A; Ward, C P; Ward, D R; Watkins, P M; Watson, A T; Watson, N K; Wells, P S; Wermes, N; White, J S; Wilson, G W; Wilson, J A; Wyatt, T R; Yamashita, S; Yekutieli, G; Zacek, V; Zer-Zion, D

    1999-01-01

    The inclusive charm hadron semileptonic branching fractions B(c to e) and B(c to mu) in Z to ccbar events have been determined using 4.4 million hadronic Z decays collected with the OPAL detector at LEP. A charm-enriched sample is obtained by selecting events with reconstructed D*+- mesons. Using leptons found in the hemisphere opposite that of the D*+- mesons, the semileptonic branching fractions of charm hadrons are measured to be B(c to e) = 0.103 +-0.009 +0.009 -0.008 and B(c to mu) = 0.090 +-0.007 +0.007 -0.006 where the first errors are in each case statistical and the others systematic. Combining these measurements, an inclusive semileptonic branching fraction of charm hadrons of B(c to l) = 0.095 +-0.006 +0.007 -0.006 is obtained.

  18. Charm physics at LHCb

    CERN Document Server

    Di Canto, A

    2015-01-01

    An overview of the latest LHCb’s measurements in the charm physics sector is presented. This includes searches for rare decays, measurements of direct and indirect CP -violating observables and precise determination of mixing parame- ters using “wrong-sign” D 0 → K + π − decays

  19. Onia, open heavy flavours, meson decays and combinatorial effects in muon pairs measurements, in ALICE at LHC

    International Nuclear Information System (INIS)

    The ALICE collaboration has proposed to build a detector dedicated to nucleus-nucleus collisions at LHC. The aim is to study strongly interacting matter at extreme energy densities and particularly to search for evidence of the predicted QCD phase transition to quark-gluon plasma (QGP). The suppression of heavy quark resonances, J/ψ and υ, is one of the most promising signatures of the quark-gluon plasma. This work gives out results of a simulation of signals and backgrounds in muon pairs measurements with a forward spectrometer, including the dimuon production from resonances, open charm, open beauty and meson decay in Pb-Pb, Ca-Ca and P-P collisions. The effect of the nature of the absorber on the mass resolution is discussed, and a comparison with measurement in the central region is also made. (author)

  20. Measurement of Charm Production Cross Sections in e^+e^- Annihilation at Energies between 3.97 and 4.26 GeV

    CERN Document Server

    Cronin-Hennessy, D; Hietala, J; Kubota, Y; Klein, T; Lang, B W; Poling, R; Scott, A W; Zweber, P; Dobbs, S; Metreveli, Z; Seth, K K; Tomaradze, A G; Libby, J; Powell, A; Wilkinson, G; Ecklund, K M; Love, W; Savinov, V; López, A; Méndez, H; Ramírez, J; Ge, J Y; Miller, D H; Shipsey, I P J; Xin, B; Adams, G S; Anderson, M; Cummings, J P; Danko, I; Hu, D; Moziak, B; Napolitano, J; He, Q; Insler, J; Muramatsu, H; Park, C S; Thorndike, E H; Yang, F; Artuso, M; Blusk, S; Khalil, S; Li, J; Mountain, R; Nisar, S; Randrianarivony, K; Sultana, N; Skwarnicki, T; Stone, S; Wang, J C; Zhang, L M; Bonvicini, G; Cinabro, D; Dubrovin, M; Lincoln, A; Rademacker, J; Asner, D M; Edwards, K W; Naik, P; Reed, J; Briere, R A; Ferguson, T; Tatishvili, G; Vogel, H; Watkins, M E; Rosner, J L; Alexander, J P; Cassel, D G; Duboscq, J E; Ehrlich, R; Fields, L; Gibbons, L; Gray, R; Gray, S W; Hartill, D L; Heltsley, B K; Hertz, D; Jones, C D; Kandaswamy, J; Kreinick, D L; Kuznetsov, V E; Mahlke-Krüger, H; Mohapatra, D; Onyisi, P U E; Patterson, J R; Peterson, D; Riley, D; Ryd, A; Sadoff, A J; Shi, X; Stroiney, S; Sun, W M; Wilksen, T; Athar, S B; Patel, R; Yelton, J; Rubin, P; Eisenstein, B I; Karliner, I; Mehrabyan, S; Lowrey, N; Selen, M; White, E J; Wiss, J; Mitchell, R E; Shepherd, M R; Besson, D; Pedlar, T K

    2008-01-01

    Using the CLEO-c detector at the Cornell Electron Storage Ring, we have measured inclusive and exclusive cross sections for the production of D+, D0 and Ds+ mesons in e+e- annihilations at thirteen center-of-mass energies between 3.97 and 4.26 GeV. Exclusive cross sections are presented for final states consisting of two charm mesons (DD, D*D, D*D*, Ds+Ds-, Ds*+Ds-, and Ds*+Ds*-) and for processes in which the charm-meson pair is accompanied by a pion. No enhancement in any final state is observed at the energy of the Y(4260).

  1. Masses and decay widths of radially excited Bottom mesons

    CERN Document Server

    Gupta, Pallavi

    2016-01-01

    Inspired from the experimental information coming from LHC [2,3] and Babar [4] for radially higher excited charmed mesons, we predict the masses and decays of the n=2 S-wave and P- wave bottom mesons using the effective lagrangian approach. Using heavy quark effective theory approach, non-perturbative parameters (?, ?1 and ?2) are fitted using the available experimental and theoretical informations on charm masses. Using heavy quark symmetry and the values of these fitted parameters, the masses of radially excited even and odd parity bottom mesons with and without strangness are predicted. These predicted masses led in constraining the decay widths of these 12 states, and also shed light on the unknown values of the higher hadronic coupling constants eeg 2 SH and eeg 2 TH. Studying the properties like masses, decays of 2S and 2P states and some hadronic couplings would help forthcoming experiments to look into these states in future.

  2. $O(1/M^{3})$ effects for heavy-light mesons in lattice NRQCD

    CERN Document Server

    Lewis, R; Lewis, Randy

    1998-01-01

    The masses of spin-singlet and spin-triplet S-wave mesons containing a single heavy quark are computed in the quenched approximation. The light quark action and gauge field action are both classically-improved and tadpole-improved, and the couplings to the heavy quark are organized by the 1/M expansion of tadpole-improved NRQCD. At each of two lattice spacings, near 0.22fm and 0.26fm, meson masses are obtained for heavy quarks spanning the region between charmed and bottom mesons. Results up to O(1/M), O(1/M^2) and O(1/M^3) are displayed separately, so that the convergence of the heavy quark expansion can be discussed. Also, the effect of each term in the O(1/M^3) contribution is computed individually. For bottom mesons the 1/M-expansion appears to be satisfactory, but the situation for charmed mesons is less favorable.

  3. O(1/M3) effects for heavy-light mesons in lattice NRQCD

    International Nuclear Information System (INIS)

    The masses of spin-singlet and spin-triplet S-wave mesons containing a single heavy quark are computed in the quenched approximation. The light quark action and gauge field action are both classically-improved and tadpole-improved, and the couplings to the heavy quark are organized by the 1/M expansion of tadpole-improved NRQCD. At each of two lattice spacings, near 0.22fm and 0.26fm, meson masses are obtained for heavy quarks spanning the region between charmed and bottom mesons. Results up to O(1/M), O(1/M2)and O(1/M3) are displayed separately, so that the convergence of the heavy quark expansion can be discussed. Also, the effect of each term in the O(1/M3) contribution is computed individually. For bottom mesons the 1/M-expansion appears to be satisfactory, but the situation for charmed mesons is less clear

  4. Strange and charm baryon masses with two flavors of dynamical twisted mass fermions

    International Nuclear Information System (INIS)

    The masses of the low-lying strange and charm baryons are evaluated using two degenerate flavors of twisted mass sea quarks for pion masses in the range of about 260 MeV to 450 MeV. The strange and charm valence quark masses are tuned to reproduce the mass of the kaon and D-meson at the physical point. The tree-level Symanzik improved gauge action is employed. We use three values of the lattice spacing, corresponding to β=3.9, β=4.05 and β=4.2 with r0/a=5.22(2), r0/a=6.61(3) and r0/a=8.31(5) respectively. We examine the dependence of the strange and charm baryons on the lattice spacing and strange and charm quark masses. The pion mass dependence is studied and physical results are obtained using heavy baryon chiral perturbation theory to extrapolate to the physical point.

  5. Charm mixing and $CP$ violation at LHCb

    CERN Document Server

    Pearce, Alex

    2016-01-01

    LHCb collected the world's largest sample of open charm decays during Run 1 of the Large Hadron Collider. This has permitted many precision measurements of charm mixing and $CP$ violation parameters, the most precise of which being $\\Delta A_{CP}$, a measurement of the relative strength of direct, time-integrated $CP$ asymmetries between two singly-Cabibbo suppressed $D^{0}$ decays. This measurement has recently been updated using promptly-produced $D^{0}$ mesons with the full Run 1 dataset, and has a precision below the per mille level. In addition, LHCb has recently made the first observation of $D^{0}$ mixing in a multi-body $D^{0}$ decay, also measuring associated coherence parameters which can be used as input to measurements of the CKM angle $\\gamma$. LHCb has also measured the mixing parameters $x$ and $y$ with a model-independent analysis of $D^{0} \\to K_{S}^{0}\\pi^{+}\\pi^{-}$ decays, and the size of direct $CP$ violation in $D^{0} \\to K_{S}^{0}K_{S}^{0}$ decays. These four analyses will be presen...

  6. Multibaryons with strangeness, charm and bottom

    Energy Technology Data Exchange (ETDEWEB)

    Kopeliovich, V.B. [Rossijskaya Akademiya Nauk, Moscow (Russian Federation). Inst. Yadernykh Issledovanij; Durham Univ. (United Kingdom). Dept. of Mathematical Sciences; Zakrzewski, W.J. [Durham Univ. (United Kingdom). Dept. of Mathematical Sciences

    2000-12-01

    The spectra of baryonic systems with strangeness, charm and bottom are considered within a ''rigid oscillator'' version of the bound state soliton model. The static properties of multiskyrmions, of baryon number up to B=8, are calculated using the recently suggested rational map ansaetze as starting field configurations. The property of binding of flavoured mesons by an SU(2) skyrmion is proved rigorously within this model. Binding energy estimates are made of the states with largest isospin which can appear as negatively charged nuclear fragments and for states with zero isospin - fragments of ''flavoured'' nuclear matter. It is shown that for all types of flavour and for vertical stroke F vertical stroke {<=}2 the isoscalar baryonic systems have a better chance to be stable against strong and electromagnetic interactions than those with nonzero isospin. Baryonic systems with charm or bottom quantum numbers are found to be bound more than strange baryonic systems. (orig.)

  7. Sigma meson in heavy ion collision

    International Nuclear Information System (INIS)

    We want to present a short theoretical prediction of the behaviour of the sigma meson in heavy ion collisions. It is considered that the sigma meson is a pion-pion correlation, resulting from the decay of the N*(1440) resonance. There will be presented some QMD simulations. (authors)

  8. Study of the machine background induced by the PEP-II collider with a mini-TPC. Study of the doubly-charmed decay of the B meson with the detector BaBar

    International Nuclear Information System (INIS)

    The work presented in this thesis is divided into two parts. The first one deals with the machine background induced by the PEP-II collider. This study has been performed with a mini-TPC before the start of the BaBar experiment. The second part concerns the measurements of the branching ratio of the decay modes B0 → D*-D(*)0K+ and of the inclusive branching ratio Br(B0 → K±X). These measurements have been obtained with the first BaBar data. During the commissioning of the PEP-II collider, the charged tracks rate close to the interaction point has been measured with the mini-TPC. This study has pointed to the fact that the machine background was much higher than predicted by the simulation. These bad background conditions were due to the poor quality of the vacuum in the rings. This relatively high pressure in the rings produces electro-magnetic showers at the interaction point due to beam gas interactions. The potential risks for the BaBar detector due to the machine backgrounds have been clearly pointed out by the studies performed for this thesis. The addition of some collimators and a deep understanding of the machine have greatly reduced the background. Nevertheless, the radiation level in BaBar is continuously monitored in order to protect the detector. The study of the b → cc-bar channel is an important point for the understanding of the overall picture of the B meson decay. With an integrated luminosity of 17.3 fb-1 recorded by the BaBar detector the following branching ratio using exclusive reconstruction technique have been measured: Br(B0 → D*-D0K+) = (0.29 ± 0.06 (stat) ± (syst)) % Br(B0 → D*-D*0K+) = (1.16 ± 0.15 (stat) ± 0.16 (syst)) % A partial reconstruction has also been developed. With an integrated luminosity of 8.9 fb-1, the branching ratio of B0 into D*-D0K+ has been measured: Br(B0 → D*-D0K+) = (0.45 ± 0.12 (stat) ± 0.25 (syst)) % This result is in good agreement with the value obtained by the exclusive analysis. Inclusive

  9. eta' meson production in proton-proton collisions

    OpenAIRE

    K Nakayama; Arellano, H. F.; Durso, J.W.; Speth, J.(Institut für Kernphysik, Forschungszentrum Jülich, Jülich, D-52425, Germany)

    1999-01-01

    The pp -> pp eta' reaction is investigated within a relativistic meson-exchange model of hadronic interactions. We explore the role of nucleonic and mesonic, as well as the N* resonance currents, in producing eta' mesons. In order to learn more about the production mechanisms, new measurements in the energy region far from the threshold are required.

  10. Photoproduction of charmed baryons

    International Nuclear Information System (INIS)

    The results of a search for the photoproduction of charmed baryons in the broad-band neutral beam at Fermi National Accelerator Laboratory are reported. The lowest lying charmed baryon (Λ/sub c/+) is observed through its decay to p-anti K0. The cross section times branching ratio of γ + C → Λ/sub c/+ + X, γ + C → p + anti K0 is measured to be sigma B = 3 nanobarns/nucleon. The total error on this measurement is estimated to be -20% to +40%. The mass of the Λ/sub c/+ is found to be 2.284 +- 0.001 GeV/c2, in good agreement with the Mark II result from SPEAR. Upper limits (90% confidence level) are set on sigma B for the modes Λ0π, Λ0πππ, pKπ

  11. Hadroproduction of Charm and Beauty

    OpenAIRE

    Karchin, Paul E.

    1997-01-01

    Recent results on the hadroproduction of charm and beauty are discussed in the context of the current theoretical and experimental status. The areas covered include production of open charm and beauty particles and charm and beauty quarkonia. Experimental results from both fixed target and colliding beam experiments are presented and compared to theoretical predictions. Predictions based on QCD perturbation theory are generally successful in explaining the shapes of differential cross section...

  12. The total charm cross section

    OpenAIRE

    R. Vogt

    2007-01-01

    We assess the theoretical uncertainties on the total charm cross section. We discuss the importance of the quark mass, the scale choice and the parton densities on the estimate of the uncertainty. We conclude that due to the small charm quark mass, which amplifies the effect of the other parameters in the calculation, the uncertainty on the total charm cross section is difficult to quantify.

  13. The decay of charmed particles

    International Nuclear Information System (INIS)

    The paper deals with the current state of knowledge of some of the properties of the charmed quark - one of the five known quarks. Two types of measurement are used to illustrate what can be learnt about the properties of charmed particles and via them charmed quarks. These two types of measurements -lifetimes and branching ratios -are briefly described using as illustrations recent experiments. Finally, conclusions as to the validity of current theoretical models are drawn. (author)

  14. Penta-quark States with Strangeness, Hidden Charm and Beauty

    CERN Document Server

    Wu, Jia-Jun

    2015-01-01

    The classical quenched quark models with three constituent quarks provide a good description for the baryon spatial ground states, but fail to reproduce the spectrum of baryon excited states. More and more evidences suggest that unquenched effects with multi-quark dynamics are necessary ingredients to solve the problem. Several new hyperon resonances reported recently could fit in the picture of penta-quark states. Based on this picture, some new hyperon excited states were predicted to exist; meanwhile with extension from strangeness to charm and beauty, super-heavy narrow $N^*$ and $\\Lambda^*$ resonances with hidden charm or beauty were predicted to be around 4.3 and 11 GeV, respectively. Recently, two of such $N^*$ with hidden charm might have been observed by the LHCb experiment. More of those states are expected to be observed in near future. This opens a new window in order to study hadronic dynamics for the multi-quark states.

  15. Penta-Quark States with Strangeness, Hidden Charm and Beauty

    Science.gov (United States)

    Wu, Jia-Jun; Zou, Bing-Song

    The classical quenched quark models with three constituent quarks provide a good description for the baryon spatial ground states, but fail to reproduce the spectrum of baryon excited states. More and more evidences suggest that unquenched effects with multi-quark dynamics are necessary ingredients to solve the problem. Several new hyperon resonances reported recently could fit in the picture of penta-quark states. Based on this picture, some new hyperon excited states were predicted to exist; meanwhile with extension from strangeness to charm and beauty, super-heavy narrow N* and Λ* resonances with hidden charm or beauty were predicted to be around 4.3 and 11 GeV, respectively. Recently, two of such N* with hidden charm might have been observed by the LHCb experiment. More of those states are expected to be observed in near future. This opens a new window in order to study hadronic dynamics for the multi-quark states.

  16. Searches for CP violation in charm decays at BABAR

    CERN Document Server

    Neri, Nicola

    2013-01-01

    In the Standard Model \\CP violation in charm decays is expected to be very small, at the level of 0.1% or less. A significant excess of \\CP violation with respect to the Standard Model predictions would be a signature of new physics. We report on recent searches for \\CP violation in charm meson decays at \\babar, using a data sample corresponding to an integrated luminosity of about 470 \\invfb. In particular, we report on searches for \\CPV in the 3-body $\\Dp\\to\\Kp\\Km\\pip$ decay and for decay modes with a \\KS in the final state, such as $\\Dp\\to\\KS\\Kp$, $\\Ds\\to\\KS\\Kp$, $\\Ds\\to\\KS\\pip$. A lifetime ratio analysis of $\\Dz\\to\\Kp\\Km, \\pip\\pim$ with respect to $\\Dz\\to\\Km\\pip$ decays, which is sensitive to \\Dz-\\Dzb mixing and \\CP violation, is also presented here.

  17. The neutron EDM vs up and charm flavour violation

    CERN Document Server

    Sala, Filippo

    2014-01-01

    We derive a strong bound on the chromo-electric dipole moment of the charm quark, and we quantify its impact on models that allow for a sizeable flavour violation in the up quark sector. In particular we show how the constraints coming from the charm and up CEDMs limit the size of new physics contributions to direct flavour violation in D meson decays. We also specialize our analysis to the cases of split-families Supersymmetry and composite Higgs models. The results we expose motivate an increase in experimental sensitivity to fundamental hadronic dipoles, and a further exploration of the SM contribution to both flavour violating D decays and nuclear electric dipole moments.

  18. Status of light scalar mesons as non-ordinary mesons

    International Nuclear Information System (INIS)

    In this talk I briefly review the status of the f0(500) and f0(980) together with the other light scalar resonances, as well as the emerging picture of a non-ordinary light meson multiplet, paying particular attention to unitarized Chiral Perturbation Theory, large Nc, semilocal duality and Regge theory arguments

  19. A direct measurement of meson-baryon contributions to the electroexcitation of the $N(1675){\\frac{5}{2}}^-$ nucleon resonance

    CERN Document Server

    Aznauryan, I G

    2014-01-01

    We report on the determination of the electrocouplings for the transition from the proton to the $N^+(1675){\\frac{5}{2}}^-$ resonance state using new differential cross section data on $e p \\rightarrow e\\pi^+ n$ by the CLAS collaboration at $1.8 \\le Q^2 < 4.5$GeV$^2$. The special feature of this state, namely, the strong suppression of its excitation through a quark transition, is used to directly determine the non-quark contributions to this process. The data have been analyzed using two different approaches, the unitary isobar model and fixed-t dispersion relations. The extracted $\\gamma^* p\\rightarrow N(1675){\\frac{5}{2}}^-$ helicity amplitudes show significant coupling through the $A^p_{1/2}$ amplitude for $Q^2 \\le 4$GeV$^2$, while $A^p_{3/2}$ drops much faster and at $Q^2 \\ge 1.8$GeV$^2$ is already much smaller than $A^p_{1/2}$. Both results are consistent with the meson-baryon contributions from the dynamical coupled-channel model.

  20. Study of no-charmed semi-leptonic decays of B mesons and measurement of the V{sub ub} term of the CKM matrix in the experiment BABAR; Etude des desintegrations semi-leptoniques non charmees des mesons B et mesure de l'element V{sub ub} de la matrice CKM dans l'experience BABAR

    Energy Technology Data Exchange (ETDEWEB)

    Serfass, B

    2001-09-01

    The aim of this work is to improve the accuracy of the measurement of the |V{sub ub}| term of the Cabibbo-Kobayashi-Maskawa matrix. |V{sub ub}| has been determined from the branching ratio of the decay: B{sup 0} {yields} {rho}{sup -}l{sup +}{nu} and experimental data from 22 millions BB-bar pairs has been used. We propose: branching ratio = (3.79{+-}0.41{sub -0.64}{sup +0.53}{+-}0.41).10{sup -4} and |V{sub ub}| = (3.83{+-}0.20{sub -0.34}{sup +0.26}{+-}0.60).10{sup -3}. The first part of this work explains how an accurate value of |V{sub ub}| can allow the standard model to be tested. The second part gives a description of the PEP-II collider and of the BABAR detector. The measurement of |V{sub ub}| is based on semi-leptonic decays, so an appropriate identification of leptons is required. This identification is made by the electromagnetic calorimeter and by the instrumented flux return (IFR) for electrons and muons respectively. The third part presents the analysis of exclusive semi-leptonic decays and the extraction of |V{sub ub}|. 5 modes of decay have been selected, the main difficulties rise from the presence of a neutrino that can not be detected and from the decay: b {yields} cl{nu} for which the branching ratio is about 100 times greater than that of decay: b {yields} ul{nu}. The quark c being heavier than the quark u, this implies the existence of an energy range for leptons that is not accessible to charmed decays. (A.C.)

  1. The Role and Detectability of the Charm Contribution to Ultra High Energy Neutrino Fluxes

    CERN Document Server

    Gandhi, Raj; Watanabe, Atsushi

    2009-01-01

    It is widely believed that charm meson production and decay may play an important role in high energy astrophysical sources of neutrinos, especially those that are baryon-rich, providing an environment conducive to pp interactions. Using slow-jet supernovae (SJS) as an example of such a source, we study the detectability of high-energy neutrinos, paying particular attention to those produced from charmed-mesons. We highlight important distinguishing features in the ultra-high energy neutrino flux which would act as markers for the role of charm in the source. In particular, charm leads to significant event rates at higher energies, after the conventional (pi, K) neutrino fluxes fall off. We calculate event rates both for a nearby single source and for diffuse SJS fluxes for an IceCube-like detector. By comparing muon event rates for the conventional and prompt fluxes in different energy bins, we demonstrate the striking energy dependence in the rates induced by the presence of charm. We also show that it lead...

  2. Charm production in Pb+Pb collisions at the Large Hadron Collider energy

    CERN Document Server

    Song, Taesoo; Cabrera, Daniel; Cassing, Wolfgang; Bratkovskaya, Elena

    2015-01-01

    We study charm production in Pb+Pb collisions at $\\sqrt{s_{\\rm NN}}=$2.76 TeV in the Parton-Hadron-String-Dynamics transport approach and the charm dynamics in the partonic and hadronic medium. The charm quarks are produced through initial binary nucleon-nucleon collisions by using the PYTHIA event generator taking into account the (anti-)shadowing incorporated in the EPS09 package. The produced charm quarks interact with off-shell massive partons in the quark-gluon plasma and are hadronized into $D$ mesons through coalescence or fragmentation close to the critical energy density, and then interact with hadrons in the final hadronic stage with scattering cross sections calculated in an effective Lagrangian approach with heavy-quark spin symmetry. The PHSD results show a reasonable $R_{\\rm AA}$ and elliptic flow of $D$ mesons in comparison to the experimental data for Pb+Pb collisions at $\\sqrt{s_{NN}}$ = 2.76 TeV from the ALICE Collaboration. We also study the effect of temperature-dependent off-shell charm q...

  3. Mass Spectra of Heavy-Light Mesons in Heavy Hadron Chiral Perturbation Theory

    CERN Document Server

    Alhakami, Mohammad H

    2016-01-01

    We study the masses of the low-lying charm and bottom mesons within the framework of heavy- hadron chiral perturbation theory. We work to third order in the chiral expansion, where meson loops contribute. In contrast to previous approaches, we use physical meson masses in evaluating these loops. This ensures that their imaginary parts are consistent with the observed widths of the D-mesons. The lowest odd- and even-parity, strange and nonstrange charm mesons provide enough constraints to determine only certain linear combinations of the low-energy constants (LECs) in the effective Lagrangian. We comment on how lattice QCD could provide further information to disentangle these constants. Then we use the results from the charm sector to predict the spectrum of odd- and even-parity of the bottom mesons. The predicted masses from our theory are in good agreement with experimentally measured masses for the case of the odd-parity sector. For the even-parity sector, the B-meson states have not yet been observed; thu...

  4. Studies of correlations between D and ${\\bar D}$ mesons in high energy photoproduction

    CERN Document Server

    Link, J M; Anjos, J C; Bediaga, I; Göbel, C; Magnin, J; Massafferri, A; De Miranda, J M; Pepe, I M; Polycarpo, E; Dos Reis, A C; Carrillo, S; Casimiro, E; Cuautle, E; Sánchez-Hernández, A; Uribe, C; Vázquez, F; Agostino, L; Cinquini, L; Cumalat, J P; O'Reilly, B; Segoni, I; Wahl, M; Butler, J N; Cheung, H W K; Chiodini, G; Gaines, I; Garbincius, P H; Garren, L A; Gottschalk, E E; Kasper, P H; Kreymer, A E; Kutschke, R; Wang, M; Benussi, L; Bertani, M; Bianco, S; Fabbri, Franco Luigi; Zallo, A; Reyes, M; Cawlfield, C; Kim, D Y; Rahimi, A; Wiss, J; Gardner, R; Kryemadhi, A; Chung, Y S; Kang, J S; Ko, B R; Kwak, J W; Lee, K B; Cho, K; Park, H; Alimonti, G; Barberis, S; Boschini, M; Cerutti, A; D'Angelo, P; Di Corato, M; Dini, P; Edera, L; Erba, S; Giammarchi, M; Inzani, P; Leveraro, F; Malvezzi, S; Menasce, D; Mezzadri, M; Moroni, L; Pedrini, D; Pontoglio, C; Prelz, F; Rovere, M; Sala, S; Davenport, T F; Arena, V; Boca, G; Bonomi, G; Gianini, G; Liguori, G; Lopes-Pegna, D; Merlo, M M; Pantea, D; Ratti, S P; Riccardi, C; Vitulo, P; Hernández, H; López, A M; Luiggi, E; Méndez, H; Paris, A; Quinones, J; Ramírez, J E; Zhang, Y; Wilson, J R; Handler, T; Mitchell, R; Engh, D; Hosack, M; Johns, W E; Nehring, M S; Sheldon, P D; Stenson, K; Vaandering, E W; Webster, M; Sheaff, M

    2003-01-01

    Studies of $D{\\bar D}$ correlations for a large sample of events containing fully and partially reconstructed pairs of charmed $D$ mesons recorded by the Fermilab photoproduction experiment FOCUS (FNAL-E831) are presented. Correlations between $D$ and ${\\bar D}$ mesons are used to study heavy quark production dynamics. We present results for fully and partially reconstructed charm pairs and comparisons to a recent version of \\textsc{Pythia} with default parameter settings. We also comment on the production of $\\psi(3770)$ in our data.

  5. Measurement of D mesons production in deep inelastic scattering at HERA

    International Nuclear Information System (INIS)

    Charm production in deep inelastic scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 82 pb-1. Charm has been tagged by reconstructing D*+, D0, D+ and D+s (+c.c.) charm mesons. The charm hadrons were measured in the kinematic range pT(D*+,D0,D+)>3 GeV, pT(D+s)>2 GeV and vertical stroke η(D) vertical stroke 22 and 0.02T(D) and η(D) in order to determine the open-charm contribution, Fcantic2(x,Q2), to the proton structure function F2. (orig.)

  6. Open charm analysis for energy loss studies with ALICE at LHC

    International Nuclear Information System (INIS)

    In high energy Pb-Pb collisions at LHC a deconfined QCD medium is expected to be produced. The open charm and beauty mesons are a powerful probe to investigate the medium properties and its effects on particle production since they experience all the deconfined phase. The ALICE experiment is well suited to perform open charm analysis thanks to the excellent tracking system, its high resolution secondary vertex reconstruction capabilities and particle identification performance. In this proceeding the status of the analysis of p-p collisions at √S = 7 TeV and the perspectives for Pb-Pb measurements will be presented. (author)

  7. Open and Hidden Charm Production in 920 GeV Proton-Nucleus Collisions

    CERN Document Server

    Husemann, U; Albrecht, H; Aleksandrov, A; Amaral, V S; Amorim, A; Aplin, S J; Aushev, V; Bagaturia, Yu S; Balagura, V; Bargiotti, M; Barsukova, O; Bastos, J; Batista, J; Bauer, C; Bauer, T S; Belkov, A A; Bertin, A; Bobchenko, B M; Böcker, M; Bogatyrev, A; Böhm, G; Brauer, M; Bruinsma, M; Bruschi, M; Buchholz, P; Büchler, M C; Buran, T; Carvalho, J; Conde, P; Cruse, C; Dam, M; Danielsen, K M; Danilov, M; De Castro, S; Deppe, H; Dong, X; Dreis, H B; Egorytchev, V; Ehret, K; Eisele, F; Emeliyanov, D; Essenov, S; Fabbri, Franco Luigi; Faccioli, P; Feuerstack-Raible, M; Flammer, J; Fominykh, B A; Funcke, M; Garrido, L; Giacobbe, B; Glass, J; Goloubkov, D; Golubkov, Yu A; Golutvin, A; Golutvin, I A; Gorbounov, I; Gorisek, A; Gouchtchine, O; Goulart, D C; Gradl, S; Gradl, W; Grimaldi, F; Guilitsky, Yu; Hansen, J D; Harr, R; Hernández, J M; Hofmann, W; Hott, T; Hulsbergen, W D; Husemann, U; Igonkina, O; Ispiryan, M; Jagla, T; Jiang, C; Kapitza, H; Karabekyan, S; Karchin, P; Karpenko, N; Keller, S; Kessler, J; Khasanov, F M; Kiryushin, Yu T; Knöpfle, K T; Kolanoski, H; Korpar, S; Krauss, C; Kreuzer, P; Krizan, P; Krücker, D; Kupper, S; Kvaratskheliia, T; Lanyov, A V; Lau, K; Lewendel, B; Lohse, T; Lomonosov, B N; Männer, R; Masciocchi, S; Massa, I; Matchikhilian, I; Medin, G; Medinnis, M; Mevius, M; Michetti, A; Mikhailov, Yu; Mizuk, R; Muresan, R; Nam, S; Zur Nedden, M; Negodaev, M A; Nörenberg, M; Nowak, S; Núñez-Pardo de Vera, M T; Ouchrif, M; Ould-Saada, F; Padilla, C; Peralta, D; Pernack, R; Pestotnik, R; Piccinini, M; Pleier, M A; Poli, M; Popov, V; Pose, A; Pose, D; Prystupa, S; Pugatch, V; Pylypchenko, Y; Pyrlik, J; Reeves, K; Ressing, D; Rick, H; Riu, I; Robmann, P; Rybnikov, V; Sánchez, F; Sbrizzi, A; Schmelling, M; Schmidt, B; Schreiner, A T; Schröder, H; Schwartz, A J; Schwarz, A S; Schwenninger, B; Schwingenheuer, B; Sciacca, F; Semprini-Cesari, N; Shiu, J; Shuvalov, S M; Silva, L; Smirnov, K V; Sozuer, L; Solunin, S A; Somov, A; Somov, S; Spengler, J; Spighi, R; Spiridonov, A A; Stanovnik, A; Staric, M; Stegmann, C; Subramanian, H S; Symalla, M; Tikhomirov, I; Titov, M; Tsakov, I; Uwer, U; Van Eldik, C; Vasilev, Yu; Villa, M; Vitale, A; Vukotic, I; Wahlberg, H; Walenta, Albert H; Walter, M; Wang, J J; Wegener, D; Werthenbach, U; Wolters, H; Wurth, R; Wurz, A; Zaitsev, Yu; Zavertyaev, M V; Zeuner, T; Zhelezov, A; Zheng, Z; Zimmermann, R; Zivko, T; Zoccoli, A

    2006-01-01

    The HERA-B collaboration has studied the production of charmonium and open charm states in collisions of 920 GeV protons with wire targets of different materials. The acceptance of the HERA-B spectrometer covers negative values of xF up to xF=-0.3 and a broad range in transverse momentum from 0.0 to 4.8 GeV/c. The studies presented in this paper include J/psi differential distributions and the suppression of J/psi production in nuclear media. Furthermore, production cross sections and cross section ratios for open charm mesons are discussed.

  8. Measurement of the D_s Decay Constant f_Ds and Observation of New Charm Resonances Decaying to D^(*)\\pi

    Energy Technology Data Exchange (ETDEWEB)

    Benitez, Jose

    2012-03-15

    The absolute branching fractions for the decays D{sub s}{sup -} {yields} {ell}{sup -}{bar {nu}}{sub {ell}} ({ell} = e, {mu}, or {tau}) are measured using a data sample corresponding to an integrated luminosity of 521 fb{sup -1} collected at center of mass energies near 10.58 GeV with the BABAR detector at the PEPII e{sup +}e{sup -} collider at SLAC. The number of D{sub s}{sup -} mesons is determined by reconstructing the recoiling system DKX{gamma} in events of the type e{sup +}e{sup -} {yields} DKXD*{sub s}{sup -}, where D*{sub s}{sup -} {yields} D{sub s}{sup -} {gamma} and X represents additional pions from fragmentation. The D{sub s}{sup -} {yields} {ell}{sup -}{nu}{sub {ell}} events are detected by full or partial reconstruction of the recoiling system DKX{gamma}{ell}. The following results are obtained: {Beta}(D{sub s}{sup -} {yields} {mu}{sup -}{nu}) = (6.02 {+-} 0.38 {+-} 0.34) x 10{sup -3}, {Beta}(D{sub s}{sup -} {yields} {tau}{sup -}{nu}) = (5.00 {+-} 0.35 {+-} 0.49) x 10{sup -2}, and B(D{sub s}{sup -} {yields} e{sup -}{nu}) < 2.8 x 10{sup -4} at 90% C.L., where the first uncertainty is statistical and the second is systematic. The branching fraction measurements are combined to determine the D{sub s}{sup -} decay constant f{sub D{sub s}} = (258.6 {+-} 6.4 {+-} 7.5) MeV. In addition, a study has been performed of the D{sup +}{pi}{sup -}, D{sup 0}{pi}{sup +}, and D*{sup +}{pi}{sup -} systems in inclusive e{sup +}e{sup -} {yields} c{bar c} interactions in a search for excited D meson states. The dataset used consists of {approx}454 fb{sup -1}. The mass spectra for these systems show, for the first time, candidates for the radial excitations of the D{sup 0}, D*{sup 0}, and D*{sup +}, as well as the L = 2 excited states of the D{sup 0} and D{sup +}, where L is the orbital angular momentum of the quarks. Finally, a prototype of a next generation Detector of Internally Reflected Cherenkov radiation (Focusing DIRC) has been tested using a 10 GeV electron beam at

  9. Search for rare B meson decays into Ds+ mesons

    International Nuclear Information System (INIS)

    A search has been performed for rare B meson decays into Ds+ mesons arising from b→u transitions, W exchange modes, B+ annihilation processes, and decays where the Ds+ is not produced via a W→c anti s quark pair coupling, using the ARGUS detector operating on the Y(4S) resonance at the e+e- storage ring DORIS II. Upper limits for individual decay modes are obtained. In addition, from a study of Ds+l- correlations an upper limit of BR(B→Ds+l-X)<1.2%(90% CL) is determined. (orig.)

  10. Charm photoproduction via fragmentation

    International Nuclear Information System (INIS)

    The next-to-leading open charm production in γp collisions is calculated within the perturbative fragmentation functions formalism, to allow resummation of αslog(p2T/m2) terms. In the large pT region (pT>m) the result is consistent with the fixed order NLO calculation, small discrepancies being found for very large differ in the definition and the relative contribution of the direct and resolved terms, but essentially agree on their sum. The resummation is found to lead a reduced sensitivity to the choice of the renormalization/ factorization scale

  11. Microstrip gas detectors development for the CMS tracker and branching fractions measurement of hadronic B decays with the BaBar experiment; Developpement de detecteur gazeux a micropistes pour le trajectographe de l'experience CMS et mesures de rapports d'embranchement de desintegrations hadroniques du meson B dans l'experience BaBar

    Energy Technology Data Exchange (ETDEWEB)

    Zghiche, A

    2007-01-15

    The Compact Muon Solenoid (CMS) is one of the two detectors, designed for the search of the Higgs boson at the Large Hadron Collider (LHC), to operate late 2007 at CERN. Micro Strip Gas Counters (MSGC) have been extensively studied to qualify as part of the CMS tracker. When exposed to highly ionizing particles and to high rates of incident particles, MSGCs have shown a good behavior allowing them to cope with the LHC environment. Similar micro pattern gaseous detectors such as Gas Electron Multiplier (GEM) and Micro Mesh gas detectors (MicroMegas) are developed to be used in high energy physics. BaBar, the detector for the Slac PEP-II asymmetric e{sup +}e{sup -} B Factory operating at the Y(4S) resonance, was designed to allow comprehensive studies of CP-violation in B-meson decays. First observation of CP violation has been realized in 2001. Since then an impressive amount of B decays measurements has been performed. Among those, we present here the branching fraction measurements of charged and neutral B decays to D{pi}{sup -}, D{sup *}{pi}{sup -}, and D{sup **}{pi}{sup -} with a missing mass method, based on a sample of 231 million Y(4S) {yields} BB-bar pairs. In order to do this, one of the B mesons is fully reconstructed and the 'recoil' one decays into a reconstructed charged pion and a companion charmed meson identified by its recoil mass, inferred by kinematics. The same sample is used to reconstruct charmed mesons (D, Ds) and baryons ({lambda}{sub c}) in the 'recoil side' allowing the measurement of the charm number in the B decays. (author)

  12. The phi-meson and Chiral-mass-meson production in heavy-ion collisions as potential probes of quark-gluon-plasma and Chiral symmetry transitions

    Science.gov (United States)

    Takahashi, Y.; Eby, P. B.

    1985-01-01

    Possibilities of observing abundances of phi mesons and narrow hadronic pairs, as results of QGP and Chiral transitions, are considered for nucleus-nucleus interactions. Kinematical requirements in forming close pairs are satisfied in K+K decays of S(975) and delta (980) mesons with small phi, and phi (91020) mesons with large PT, and in pi-pi decays of familiar resonance mesons only in a partially restored chiral symmetry. Gluon-gluon dominance in QGP can enhance phi meson production. High hadronization rates of primordial resonance mesons which form narrow hadronic pairs are not implausible. Past cosmic ray evidences of anomalous phi production and narrow pair abundances are considered.

  13. Recent charm measurements through hadronic decay channels with STAR at RHIC in 200 GeV Cu+Cu collisions

    Energy Technology Data Exchange (ETDEWEB)

    Baumgart, Stephen [Yale University, Department of Physics, New Haven, CT (United States)

    2009-07-15

    We report on the measurements of D{sup 0} and D{sub s} meson production in 200 GeV Cu+Cu collisions at the STAR at RHIC experiment. Results are discussed with reference to pQCD predictions of the open charm cross-section as well as the statistical hadronization model. (orig.)

  14. Recent charm measurements through hadronic decay channels with STAR at RHIC in 200 GeV Cu+Cu collisions

    International Nuclear Information System (INIS)

    We report on the measurements of D0 and Ds meson production in 200 GeV Cu+Cu collisions at the STAR at RHIC experiment. Results are discussed with reference to pQCD predictions of the open charm cross-section as well as the statistical hadronization model. (orig.)

  15. Charm studies in emulsion

    CERN Document Server

    Kalinin, Sergey

    Neutrino-nucleon scattering is an effective way to investigate the inner structure of the nucleon, to extract the Standard Model parameters and to explore heavy quarks production dynamics. In the last decades, several experiments have been constructed to study weak interactions of neutrinos with nucleons. One of them was CERN-WA95 experiment operated by the CHORUS collaboration. It is based on a hybrid detector with nuclear emulsion as a target followed by electronic devices. Nuclear emulsion provides three dimensional spatial information with an outstanding resolution of the order of one micron. Therefore, it is ideal to detect short-lived particles. A special technique has been developed to reconstruct events in the emulsion which allows to perform a detailed investigation of events such as charmed hadrons production by neutrinos. As a result, the backround in the selected charm sample is up to six times lower compared to similar experiments. Such a method also permits to make direct measurements of some qu...

  16. Azimuthal anisotropy of D -meson production in Pb-Pb collisions at sNN =2.76 TeV

    NARCIS (Netherlands)

    Abelev, B.; Adam, J.; Adamová, D.; Aggarwal, M. M.; Agnello, M.; Agostinelli, A.; Agrawal, N.; Ahammed, Z.; Ahmad, N.; Ahmed, I.; Ahn, S. U.; Ahn, S. A.; Aimo, I.; Aiola, S.; Ajaz, M.; Akindinov, A.; Alam, S. N.; Aleksandrov, D.; Alessandro, B.; Alexandre, D.; Alici, A.; Alkin, A.; Alme, J.; Alt, T.; Altinpinar, S.; Altsybeev, I.; Alves Garcia Prado, C.; Andrei, C.; Andronic, A.; Anguelov, V.; Anielski, J.; Antičić, T.; Antinori, F.; Antonioli, P.; Aphecetche, L.; Appelshäuser, H.; Arcelli, S.; Armesto, N.; Arnaldi, R.; Aronsson, T.; Arsene, I. C.; Arslandok, M.; Augustinus, A.; Averbeck, R.; Awes, T. C.; Azmi, M. D.; Bach, M.; Badalà, A.; Baek, Y. W.; Bagnasco, S.; Bailhache, R.; Bala, R.; Baldisseri, A.; Baltasar Dos Santos Pedrosa, F.; Baral, R. C.; Barbera, R.; Barile, F.; Barnaföldi, G. G.; Barnby, L. S.; Barret, V.; Bartke, J.; Basile, M.; Bastid, N.; Basu, S.; Bathen, B.; Batigne, G.; Batista Camejo, A.; Batyunya, B.; Batzing, P. C.; Baumann, C.; Bearden, I. G.; Beck, H.; Bedda, C.; Behera, N. K.; Belikov, I.; Bellini, F.; Bellwied, R.; Belmont-Moreno, E.; Belmont, R.; Belyaev, V.; Bencedi, G.; Beole, S.; Berceanu, I.; Bercuci, A.; Berdnikov, Y.; Berenyi, D.; Berger, M. E.; Bertens, R. A.; Berzano, D.; Betev, L.; Bhasin, A.; Bhat, I. R.; Bhati, A. K.; Bhattacharjee, B.; Bhom, J.; Bianchi, L.; Bianchi, N.; Bianchin, C.; Bielčík, J.; Bielčíková, J.; Bilandzic, A.; Bjelogrlic, S.; Blanco, F.; Blau, D.; Blume, C.; Bock, F.; Bogdanov, A.; Bøggild, H.; Bogolyubsky, M.; Böhmer, F. V.; Boldizsár, L.; Bombara, M.; Book, J.; Borel, H.; Borissov, A.; Bossú, F.; Botje, M.; Botta, E.; Böttger, S.; Braun-Munzinger, P.; Bregant, M.; Breitner, T.; Broker, T. A.; Browning, T. A.; Broz, M.; Bruna, E.; Bruno, G. E.; Budnikov, D.; Buesching, H.; Bufalino, S.; Buncic, P.; Busch, O.; Buthelezi, Z.; Caffarri, D.; Cai, X.; Caines, H.; Calero Diaz, L.; Caliva, A.; Calvo Villar, E.; Camerini, P.; Carena, F.; Carena, W.; Castillo Castellanos, J.; Casula, E. A R; Catanescu, V.; Cavicchioli, C.; Ceballos Sanchez, C.; Cepila, J.; Cerello, P.; Chang, B.; Chapeland, S.; Charvet, J. L.; Chattopadhyay, S.; Chattopadhyay, S.; Chelnokov, V.; Cherney, M.; Cheshkov, C.; Cheynis, B.; Chibante Barroso, V.; Chinellato, D. D.; Chochula, P.; Chojnacki, M.; Choudhury, S.; Christakoglou, P.; Christensen, C. H.; Christiansen, P.; Chujo, T.; Chung, S. U.; Cicalo, C.; Cifarelli, L.; Cindolo, F.; Cleymans, J.; Colamaria, F.; Colella, D.; Collu, A.; Colocci, M.; Conesa Balbastre, G.; Conesa Del Valle, Z.; Connors, M. E.; Contreras, J. G.; Cormier, T. M.; Corrales Morales, Y.; Cortese, P.; Cortés Maldonado, I.; Cosentino, M. R.; Costa, F.; Crochet, P.; Cruz Albino, R.; Cuautle, E.; Cunqueiro, L.; Dainese, A.; Dang, R.; Danu, A.; Das, D.; Das, I.; Das, K.; Das, S.; Dash, A.; Dash, S.; De, S.; Delagrange, H.; Deloff, A.; Dénes, E.; D'Erasmo, G.; De Caro, A.; De Cataldo, G.; De Cuveland, J.; De Falco, A.; De Gruttola, D.; De Marco, N.; De Pasquale, S.; De Rooij, R.; Diaz Corchero, M. A.; Dietel, T.; Dillenseger, P.; Divià, R.; Di Bari, D.; Di Liberto, S.; Di Mauro, A.; Di Nezza, P.; Djuvsland, O.; Dobrin, A.; Dobrowolski, T.; Domenicis Gimenez, D.; Dönigus, B.; Dordic, O.; Dørheim, S.; Dubey, A. K.; Dubla, A.; Ducroux, L.; Dupieux, P.; Dutta Majumdar, A. K.; Hilden, T. E.; Ehlers, R. J.; Elia, D.; Engel, H.; Erazmus, B.; Erdal, H. A.; Eschweiler, D.; Espagnon, B.; Esposito, M.; Estienne, M.; Esumi, S.; Evans, D.; Evdokimov, S.; Fabris, D.; Faivre, J.; Falchieri, D.; Fantoni, A.; Fasel, M.; Fehlker, D.; Feldkamp, L.; Felea, D.; Feliciello, A.; Feofilov, G.; Ferencei, J.; Fernández Téllez, A.; Ferreiro, E. 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H.; Haake, R.; Haaland, O.; Hadjidakis, C.; Haiduc, M.; Hamagaki, H.; Hamar, G.; Hanratty, L. D.; Hansen, A.; Harris, J. W.; Hartmann, H.; Harton, A.; Hatzifotiadou, D.; Hayashi, S.; Heckel, S. T.; Heide, M.; Helstrup, H.; Herghelegiu, A.; Herrera Corral, G.; Hess, B. A.; Hetland, K. F.; Hippolyte, B.; Hladky, J.; Hristov, P.; Huang, M.; Humanic, T. J.; Hussain, N.; Hutter, D.; Hwang, D. S.; Ilkaev, R.; Ilkiv, I.; Inaba, M.; Innocenti, G. M.; Ionita, C.; Ippolitov, M.; Irfan, M.; Ivanov, M.; Ivanov, V.; Jachołkowski, A.; Jacobs, P. M.; Jahnke, C.; Jang, H. J.; Janik, M. A.; Jayarathna, P. H S Y; Jena, C.; Jena, S.; Jimenez Bustamante, R. T.; Jones, P. G.; Jung, H.; Jusko, A.; Kadyshevskiy, V.; Kalcher, S.; Kalinak, P.; Kalweit, A.; Kamin, J.; Kang, J. H.; Kaplin, V.; Kar, S.; Karasu Uysal, A.; Karavichev, O.; Karavicheva, T.; Karpechev, E.; Kebschull, U.; Keidel, R.; Keijdener, D. L D; Khan, M. M.; Khan, P.; Khan, S. A.; Khanzadeev, A.; Kharlov, Y.; Kileng, B.; Kim, B.; Kim, D. 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A.; Pshenichnov, I.; Puddu, G.; Pujahari, P.; Punin, V.; Putschke, J.; Qvigstad, H.; Rachevski, A.; Raha, S.; Rak, J.; Rakotozafindrabe, A.; Ramello, L.; Raniwala, R.; Raniwala, S.; Räsänen, S. S.; Rascanu, B. T.; Rathee, D.; Rauf, A. W.; Razazi, V.; Read, K. F.; Real, J. S.; Redlich, K.; Reed, R. J.; Rehman, A.; Reichelt, P.; Reicher, M.; Reidt, F.; Renfordt, R.; Reolon, A. R.; Reshetin, A.; Rettig, F.; Revol, J. P.; Reygers, K.; Riabov, V.; Ricci, R. A.; Richert, T.; Richter, M.; Riedler, P.; Riegler, W.; Riggi, F.; Rivetti, A.; Rocco, E.; Rodríguez Cahuantzi, M.; Rodriguez Manso, A.; Røed, K.; Rogochaya, E.; Rohni, S.; Rohr, D.; Röhrich, D.; Romita, R.; Ronchetti, F.; Ronflette, L.; Rosnet, P.; Rossi, A.; Roukoutakis, F.; Roy, A.; Roy, C.; Roy, P.; Rubio Montero, A. J.; Rui, R.; Russo, R.; Ryabinkin, E.; Ryabov, Y.; Rybicki, A.; Sadovsky, S.; Šafařík, K.; Sahlmuller, B.; Sahoo, R.; Sahu, P. K.; Saini, J.; Sakai, S.; Salgado, C. A.; Salzwedel, J.; Sambyal, S.; Samsonov, V.; Sanchez Castro, X.; Sánchez Rodríguez, F. J.; Šándor, L.; Sandoval, A.; Sano, M.; Santagati, G.; Sarkar, D.; Scapparone, E.; Scarlassara, F.; Scharenberg, R. P.; Schiaua, C.; Schicker, R.; Schmidt, C.; Schmidt, H. R.; Schuchmann, S.; Schukraft, J.; Schulc, M.; Schuster, T.; Schutz, Y.; Schwarz, K.; Schweda, K.; Scioli, G.; Scomparin, E.; Scott, R.; Segato, G.; Seger, J. E.; Sekiguchi, Y.; Selyuzhenkov, I.; Seo, J.; Serradilla, E.; Sevcenco, A.; Shabetai, A.; Shabratova, G.; Shahoyan, R.; Shangaraev, A.; Sharma, N.; Sharma, S.; Shigaki, K.; Shtejer, K.; Sibiriak, Y.; Sicking, E.; Siddhanta, S.; Siemiarczuk, T.; Silvermyr, D.; Silvestre, C.; Simatovic, G.; Singaraju, R.; Singh, R.; Singha, S.; Singhal, V.; Sinha, B. C.; Sinha, T.; Sitar, B.; Sitta, M.; Skaali, T. B.; Skjerdal, K.; Slupecki, M.; Smirnov, N.; Snellings, R. 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W.; Van Leeuwen, M.; Vargas, A.; Vargyas, M.; Varma, R.; Vasileiou, M.; Vasiliev, A.; Vechernin, V.; Veldhoen, M.; Velure, A.; Venaruzzo, M.; Vercellin, E.; Vergara Limón, S.; Vernet, R.; Verweij, M.; Vickovic, L.; Viesti, G.; Viinikainen, J.; Vilakazi, Z.; Villalobos Baillie, O.; Vinogradov, A.; Vinogradov, L.; Vinogradov, Y.; Virgili, T.; Viyogi, Y. P.; Vodopyanov, A.; Völkl, M. A.; Voloshin, K.; Voloshin, S. A.; Volpe, G.; Von Haller, B.; Vorobyev, I.; Vranic, D.; Vrláková, J.; Vulpescu, B.; Vyushin, A.; Wagner, B.; Wagner, J.; Wagner, V.; Wang, M.; Wang, Y.; Watanabe, D.; Weber, M.; Wessels, J. P.; Westerhoff, U.; Wiechula, J.; Wikne, J.; Wilde, M.; Wilk, G.; Wilkinson, J.; Williams, M. C S; Windelband, B.; Winn, M.; Yaldo, C. G.; Yamaguchi, Y.; Yang, H.; Yang, P.; Yang, S.; Yano, S.; Yasnopolskiy, S.; Yi, J.; Yin, Z.; Yoo, I. K.; Yushmanov, I.; Zaccolo, V.; Zach, C.; Zaman, A.; Zampolli, C.; Zaporozhets, S.; Zarochentsev, A.; Závada, P.; Zaviyalov, N.; Zbroszczyk, H.; Zgura, I. S.; Zhalov, M.; Zhang, H.; Zhang, X.; Zhang, Y.; Zhao, C.; Zhigareva, N.; Zhou, D.; Zhou, F.; Zhou, Y.; Zhou, Zhuo; Zhu, H.; Zhu, J.; Zhu, X.; Zichichi, A.; Zimmermann, A.; Zimmermann, M. B.; Zinovjev, G.; Zoccarato, Y.; Zyzak, M.

    2014-01-01

    The production of the prompt charmed mesons D0, D+, and D∗+ relative to the reaction plane was measured in Pb-Pb collisions at a center-of-mass energy per nucleon-nucleon collision of sNN=2.76TeV with the ALICE detector at the CERN Large Hadron Collider. D mesons were reconstructed via their hadroni

  17. Studies of Excited $D$ mesons in $B$ meson decays

    CERN Document Server

    AUTHOR|(CDS)2082679

    This thesis documents the studies of several three-body B + meson decays, each with a charged charmed meson in the final state. All analyses presented use a data sample recorded by the LHCb detector in 2011 and 2012, corresponding to an integrated luminosity of 3.0 $fb^{-1}$ of $pp$ collision data. The $B^{+} \\to D^{-}K^{+}\\pi^{+}$ and $B^{+} \\to D^{+}K^{+}\\pi^{-}$ decay modes are observed for the first time. The branching fraction of the favoured $B^{+} \\to D^{-}K^{+}\\pi^{+}$ decay mode is measured relative to the topologically similar $B^{+} \\to D^{-}\\pi^{+}\\pi^{+}$ decay and the $B^{+} \\to D^{-}K^{+}\\pi^{+}$ final state is used as a normalisation channel for the suppressed $B^{+} \\to D^{+}K^{+}\\pi^{-}$ decay branching fraction measurement. Searches are performed for the quasi-two-body decays $B^{+} \\to D^{+}K^{*}(892)^{0}$ and $B^{+} \\to D_{2}^{*}(2460)^{0}K^{+}$, using the sample of $B^{+} \\to D^{+}K^{+}\\pi^{-}$ candidate decays. No significant signals are observed for either decay mode and upper limits a...

  18. Direct evidence for W exchange in charmed meson decay

    International Nuclear Information System (INIS)

    Using the ARGUS detector at DORIS II, we have observed a signal of 36.7+-8.0 events in the decay channel D0 -> Ksub(s)0PHI. In the same data sample, we have observed the well established decay D0 -> Ksub(s)0π+π-, and find the ratio, Br(D0 -> Ksub(s)0PHI)/Br(D0 -> Ksub(s)0π+π-), to be 0.186+-0.052. The substantial value of (0.99+-0.32+-0.17)% then derived for the branching ratio for D0 -> anti K0PHI gives direct evidence that W exchange contributes to D0 decay. (orig.)

  19. Charmed and light pseudoscalar meson decay constants from HISQ simulations

    CERN Document Server

    Bazavov, A; Bouchard, C; DeTar, C; Du, D; El-Khadra, A X; Foley, J; Freeland, E D; Gámiz, E; Gottlieb, Steven; Heller, U M; Kim, J; Komijani, J; Kronfeld, A S; Laiho, J; Levkova, L; Mackenzie, P B; Neil, E T; Simone, J N; Sugar, R L; Toussaint, D; Van de Water, R S; Zhou, R

    2014-01-01

    We compute the leptonic decay constants $f_{D^+}$, $f_{D_s}$, and $f_{K^+}$, and the quark-mass ratios $m_c/m_s$ and $m_s/m_l$ in unquenched lattice QCD. We use the MILC highly improved staggered quark (HISQ) ensembles with four dynamical quark flavors. Our primary results are $f_{D^+} = 212.6(0.4)({}^{+1.0}_{-1.2})\\ \\mathrm{MeV}$, $f_{D_s} = 249.0(0.3)({}^{+1.1}_{-1.5})\\ \\mathrm{MeV}$, and $f_{D_s}/f_{D^+} = 1.1712(10)({}^{+29}_{-32})$, where the errors are statistical and total systematic, respectively. We also obtain $f_{K^+}/f_{\\pi^+} = 1.1956(10)({}^{+26}_{-18})$, updating our previous result, and determine the quark-mass ratios $m_s/m_l = 27.35(5)({}^{+10}_{-7})$ and $m_c/m_s = 11.747(19)({}^{+59}_{-43})$. When combined with experimental measurements of the decay rates, our results lead to precise determinations of the CKM matrix elements $|V_{us}| = 0.22487(51) (29)(20)(5)$, $|V_{cd}|=0.217(1) (5)(1)$ and $|V_{cs}|= 1.010(5)(18)(6)$, where the errors are from this calculation of the decay constants, th...

  20. Inclusive meson-resonance production and fragmentation of u-quark jets and diquarks in high-energy neutrino-deuterium interactions

    International Nuclear Information System (INIS)

    Inclusive neutrino-nucleon charged current interactions are studied in the neutrino energies ranging from 10 to 250 GeV with an average step approximately 50 GeV. Topics covered include: experimental details; selection of charged-current events; inclusive distributions; VEE identification; inclusive vector meson production in muon neutrino-deuterium charged-current interactions; inclusive meson production rates; and diquark fragmentation into lambda neutral particles

  1. D-Meson Production from Recombination in Hadronic Collisions

    CERN Document Server

    Rapp, R

    2003-01-01

    Nonperturbative effects in $D$-meson production in pion-nucleon and proton-nucleon collisions are investigated within the recombination model. The coalescence of perturbatively created charm quarks with sea- and valence-quarks from projectile and target fragments is shown to be competitive in magnitude with standard fragmentation calculations at both central (small $x_F$) and forward rapidities. Corresponding flavor asymmetries for inclusive $D$-meson production are thus mostly generated on the (light-) parton distribution level, and turn out to be in reasonable overall agreement with available fixed-target data. Predictions for upcoming measurements at RHIC are given.

  2. Charm counting in b decays

    CERN Document Server

    Buskulic, Damir; Décamp, D; Ghez, P; Goy, C; Lees, J P; Lucotte, A; Minard, M N; Nief, J Y; Odier, P; Pietrzyk, B; Casado, M P; Chmeissani, M; Crespo, J M; Delfino, M C; Efthymiopoulos, I; Fernández, E; Fernández-Bosman, M; Carrido, L; Juste, A; Martínez, M; Orteu, S; Padilla, C; Park, I C; Pascual, A; Perlas, J A; Riu, I; Sánchez, F; Teubert, F; Colaleo, A; Creanza, D; De Palma, M; Gelao, G; Girone, M; Iaselli, Giuseppe; Maggi, G; Maggi, M; Marinelli, N; Nuzzo, S; Ranieri, A; Raso, G; Ruggieri, F; Selvaggi, G; Silvestris, L; Tempesta, P; Tricomi, A; Zito, G; Huang, X; Lin, J; Ouyang, Q; Wang, T; Xie, Y; Xu, R; Xue, S; Zhang, J; Zhang, L; Zhao, W; Alemany, R; Bazarko, A O; Bonvicini, G; Bright-Thomas, P G; Cattaneo, M; Cerutti, F; Comas, P; Coyle, P; Drevermann, H; Forty, Roger W; Frank, M; Hagelberg, R; Harvey, J; Janot, P; Jost, B; Kneringer, E; Knobloch, J; Lehraus, Ivan; Lutters, G; Martin, E B; Mato, P; Minten, Adolf G; Miquel, R; Mir, L M; Moneta, L; Oest, T; Pacheco, A; Pusztaszeri, J F; Ranjard, F; Rensing, P E; Rizzo, G; Rolandi, Luigi; Schlatter, W D; Schmelling, M; Schmitt, M; Schneider, O; Tejessy, W; Tomalin, I R; Venturi, A; Wachsmuth, H W; Wagner, A; Ajaltouni, Ziad J; Barrès, A; Boyer, C; Falvard, A; Gay, P; Guicheney, C; Henrard, P; Jousset, J; Michel, B; Monteil, S; Montret, J C; Pallin, D; Perret, P; Podlyski, F; Proriol, J; Rosnet, P; Rossignol, J M; Fearnley, Tom; Hansen, J B; Hansen, J D; Hansen, J R; Hansen, P H; Nilsson, B S; Rensch, B; Wäänänen, A; Kyriakis, A; Markou, C; Simopoulou, Errietta; Siotis, I; Vayaki, Anna; Zachariadou, K; Blondel, A; Bonneaud, G R; Brient, J C; Bourdon, P; Rougé, A; Rumpf, M; Valassi, Andrea; Verderi, M; Videau, H L; Candlin, D J; Parsons, M I; Focardi, E; Parrini, G; Corden, M; Georgiopoulos, C H; Jaffe, D E; Antonelli, A; Bencivenni, G; Bologna, G; Bossi, F; Campana, P; Capon, G; Casper, David William; Chiarella, V; Felici, G; Laurelli, P; Mannocchi, G; Murtas, F; Murtas, G P; Passalacqua, L; Pepé-Altarelli, M; Curtis, L; Dorris, S J; Halley, A W; Knowles, I G; Lynch, J G; O'Shea, V; Raine, C; Reeves, P; Scarr, J M; Smith, K; Teixeira-Dias, P; Thompson, A S; Thomson, F; Thorn, S; Turnbull, R M; Becker, U; Geweniger, C; Graefe, G; Hanke, P; Hansper, G; Hepp, V; Kluge, E E; Putzer, A; Schmidt, M; Sommer, J; Tittel, K; Werner, S; Wunsch, M; Abbaneo, D; Beuselinck, R; Binnie, David M; Cameron, W; Dornan, Peter J; Moutoussi, A; Nash, J; Sedgbeer, J K; Stacey, A M; Williams, M D; Dissertori, G; Girtler, P; Kuhn, D; Rudolph, G; Betteridge, A P; Bowdery, C K; Colrain, P; Crawford, G; Finch, A J; Foster, F; Hughes, G; Sloan, Terence; Williams, M I; Galla, A; Giehl, I; Greene, A M; Hoffmann, C; Jakobs, K; Kleinknecht, K; Quast, G; Renk, B; Rohne, E; Sander, H G; Van Gemmeren, P; Zeitnitz, C; Aubert, Jean-Jacques; Bencheikh, A M; Benchouk, C; Bonissent, A; Bujosa, G; Calvet, D; Carr, J; Diaconu, C A; Etienne, F; Konstantinidis, N P; Payre, P; Rousseau, D; Talby, M; Sadouki, A; Thulasidas, M; Trabelsi, K; Aleppo, M; Ragusa, F; Bauer, C; Berlich, R; Blum, Walter; Büscher, V; Dietl, H; Dydak, Friedrich; Ganis, G; Gotzhein, C; Kroha, H; Lütjens, G; Lutz, Gerhard; Männer, W; Moser, H G; Richter, R H; Rosado-Schlosser, A; Schael, S; Settles, Ronald; Seywerd, H C J; Saint-Denis, R; Stenzel, H; Wiedenmann, W; Wolf, G; Boucrot, J; Callot, O; Choi, Y; Cordier, A; Davier, M; Duflot, L; Grivaz, J F; Heusse, P; Höcker, A; Jacholkowska, A; Jacquet, M; Kim, D W; Le Diberder, F R; Lefrançois, J; Lutz, A M; Nikolic, I A; Park, H J; Schune, M H; Simion, S; Veillet, J J; Videau, I; Zerwas, D; Azzurri, P; Bagliesi, G; Batignani, G; Bettarini, S; Bozzi, C; Calderini, G; Carpinelli, M; Ciocci, M A; Ciulli, V; Dell'Orso, R; Fantechi, R; Ferrante, I; Foà, L; Forti, F; Giassi, A; Giorgi, M A; Gregorio, A; Ligabue, F; Lusiani, A; Marrocchesi, P S; Messineo, A; Palla, Fabrizio; Sanguinetti, G; Sciabà, A; Spagnolo, P; Steinberger, Jack; Tenchini, Roberto; Tonelli, G; Vannini, C; Verdini, P G; Blair, G A; Bryant, L M; Chambers, J T; Gao, Y; Green, M G; Medcalf, T; Perrodo, P; Strong, J A; Von Wimmersperg-Töller, J H; Botterill, David R; Clifft, R W; Edgecock, T R; Haywood, S; Maley, P; Norton, P R; Thompson, J C; Wright, A E; Bloch-Devaux, B; Colas, P; Emery, S; Kozanecki, Witold; Lançon, E; Lemaire, M C; Locci, E; Pérez, P; Rander, J; Renardy, J F; Roussarie, A; Schuller, J P; Schwindling, J; Trabelsi, A; Vallage, B; Black, S N; Dann, J H; Johnson, R P; Kim, H Y; Litke, A M; McNeil, M A; Taylor, G; Booth, C N; Boswell, R; Brew, C A J; Cartwright, S L; Combley, F; Köksal, A; Lehto, M H; Newton, W M; Reeve, J; Thompson, L F; Böhrer, A; Brandt, S; Cowan, G D; Grupen, Claus; Minguet-Rodríguez, J A; Rivera, F; Saraiva, P; Smolik, L; Stephan, F; Apollonio, M; Bosisio, L; Della Marina, R; Giannini, G; Gobbo, B; Musolino, G; Rothberg, J E; Wasserbaech, S R; Armstrong, S R; Elmer, P; Feng, Z; Ferguson, D P S; Gao, Y S; González, S; Grahl, J; Greening, T C; Hayes, O J; Hu, H; McNamara, P A; Nachtman, J M; Orejudos, W; Pan, Y B; Saadi, Y; Scott, I J; Walsh, A M; Walsh, J; Wu, X; Yamartino, J M; Zheng, M; Zobernig, G

    1996-01-01

    The inclusive production of charmed particles in Z -> bb decays has been measured from the yield of D^0, D^+, D^+_s and Lambda_{c}^+ decays in a sample of qq events with high b purity collected with the ALEPH detector from 1992 to 1995. From these measurements, adding the charmonia production rate and an estimate of the charmed strange baryon contribution, the average number of charm quarks per b decay is determined to be n_c = 1.230 \\pm 0.036 \\pm 0.038 \\pm 0.053 where the uncertainties are due to statistics, systematic effects and branching ratios, respectively.

  3. Charm production and QCD analysis at HERA and LHC

    International Nuclear Information System (INIS)

    In this thesis the study of charm production in ep and pp collisions is presented. The heavy-quark masses provide a hard scale, allowing the application of perturbative QCD. A measurement of D+-meson production in deep inelastic scattering with the ZEUS detector at HERA is presented. The analysis was performed using a data sample with an integrated luminosity of 354 pb-1. Differential cross sections were measured as a function of virtuality Q2, inelasticity y, transverse momentum and pseudorapidity of the D+ mesons. Lifetime information was used to reduce the combinatorial background significantly. Next-to-leading-order QCD predictions in the fixed-flavour-number scheme were compared to the data. This measurement was combined with other H1 and ZEUS measurements of charm production. The combination was performed at inclusive level for the reduced charm cross sections, which were obtained from the measured visible cross sections, extrapolated to the full phase space using the shape of the theoretical predictions in the fixed-flavour-number scheme. The combination method accounts for the correlations of the systematic uncertainties among the different datasets, thus allowing cross calibration of different measurements. The combined charm data were compared to QCD predictions in various heavy-flavour schemes and used together with the inclusive production data at HERA as input for QCD analyses to determine the charm running mass in the MS renormalisation scheme and the optimal values of the charm-quark mass parameters in other heavy-flavour schemes. An additional combination of the H1 and ZEUS D*+ visible cross sections was performed to provide the combined cross sections without theory-related uncertainties from the extrapolation procedure. This combination also provides differential cross sections as a function of the D*+ kinematic variables. Next-to-leading-order QCD predictions in the fixed-flavour-number scheme were compared to the combined D*+ cross sections and

  4. Study of the K K{pi} meson resonances produced in antiproton proton annihilations at 750 MeV/c; Estudio de resonancias mesonicas en el sistema KK{pi} en aniquilaciones de antiprotones a 750 MeV/cde momento

    Energy Technology Data Exchange (ETDEWEB)

    Gil Lopez, E.

    1977-07-01

    In this work we present an analysis of the antiproton proton annihilations into strange particles at 700 and 750 MeV/c, restricted to the four and five body final states. We study in detail the resonances decaying into the K K{pi}; system, in particular the D and E mesons. For the D meson we present a determination of i ts mass, width, isospin, G-parity, C-parity and spin. For the E meson we present parametrizations of the complete final state which decrease its statistical significance in this type of production. (Author)

  5. Diffractive hadronic production of D mesons

    International Nuclear Information System (INIS)

    A search for charmed D mesons was made with a 217 GeV π- beam on a liquid hydrogen target. The Chicago Cyclotron Spectrometer at Fermilab was used to analyze the hadronic decay of a D meson in coincidence with a prompt muon and a recoil proton. A total of 50 +- 12 D+- events were observed with equal numbers in the two channels K+-π-+π-+. Some of the cuts selected diffractive events. When these cuts were removed the signal remained the same, although the background was greatly increased. The Feynman X and angular distributions were consistent with diffractive production. A diffractive model yielded a cross section of (6 to 10) +- 4 μb

  6. A Search for the LHCb Charmed 'Pentaquark' using Photo-Production of $J/{\\psi}$ at Threshold in Hall C at Jefferson Lab

    CERN Document Server

    Meziani, Z -E; Paolone, M; Chudakov, E; Jones, M; Adhikari, K; Aniol, K; Armstrong, W; Arrington, J; Asaturyan, A; Atac, H; Bae, S; Bhatt, H; Bhetuwal, D; Chen, J -P; Chen, X; Choi, H; Choi, S; Diefenthaler, M; Dunne, J; Dupré, R; Duran, B; Dutta, D; El-Fassi, L; Fu, Q; Gao, H; Go, H; Gu, C; Ha, J; Hafidi, K; Hansen, O; Hattawy, M; Higinbotham, D; Huber, G M; Markowitz, P; Meekins, D; Mkrtchyan, H; Li, W; Li, X; Liu, T; Peng, C; Pentchev, L; Pooser, E; Rehfuss, M; Sparveris, N; Tadevosyan, V; Wang, R; Wesselmann, F R; Wood, S; Xiong, W; Yan, X; Ye, L; Ye, Z; Zafar, A; Zhang, Y; Zhao, F; Zhao, Z; Zhamkochyana, S

    2016-01-01

    We propose to measure the photo-production cross section of $J/{\\psi}$ near threshold, in search of the recently observed LHCb hidden-charm resonances $P_c$(4380) and $P_c$(4450) consistent with 'pentaquarks'. The observation of these resonances in photo-production will provide strong evidence of the true resonance nature of the LHCb states, distinguishing them from kinematic enhancements. A bremsstrahlung photon beam produced with an 11 GeV electron beam at CEBAF covers the energy range of $J/{\\psi}$ production from the threshold photo-production energy of 8.2 GeV, to an energy beyond the presumed $P_c$(4450) resonance. The experiment will be carried out in Hall C at Jefferson Lab using a 50{\\mu}A electron beam incident on a 9% copper radiator. The resulting photon beam passes through a 15 cm liquid hydrogen target, producing $J/{\\psi}$ mesons through a diffractive process in the $t$-channel, or through a resonant process in the $s$- and $u$-channel. The decay $e^+e^-$ pair of the $J/{\\psi}$ will be detected...

  7. On the hidden charm pentaquarks in $\\Lambda_b \\to J/\\psi K^- p$ decay

    CERN Document Server

    Roca, L

    2016-01-01

    In a previous work we presented a theoretical analysis of the $\\Lambda_b \\to J/\\psi K^- p$ reaction from where a recent experiment by the LHCb collaboration at CERN claimed the existence of two hidden charm pentaquarks, $P_c(4380)^+$ and $P_c(4450)^+$. In that work we focused only on the $\\Lambda(1405)$ and $P_c(4450)^+$ signals and discussed the possible explanation of this pentaquark state within the picture of a dynamical meson-baryon molecule made up mostly from $\\bar D^* \\Sigma_c$ and $\\bar D^* \\Sigma^*_c$ components. In the present work we improve upon the previous one by considering the total $K^- p$ and $J/\\psi p$ data including all the relevant resonances contributing to the spectra, and discuss the possible nature of both $P_c(4380)^+$ and $P_c(4450)^+$. We also discuss several important topics, like the effect of a contact term in the reaction, neglected in the analysis of the original experimental work, the viability of reproducing the data without the $P_c(4380)^+$ and the possible quantum number...

  8. Meson Spectroscopy at COMPASS

    CERN Document Server

    Grube, Boris

    2015-01-01

    The COmmon Muon and Proton Apparatus for Structure and Spectroscopy (COMPASS) is a multi-purpose fixed-target experiment at the CERN Super Proton Synchrotron (SPS) aimed at studying the structure and spectrum of hadrons. The two-stage spectrometer has a good acceptance for charged as well as neutral particles over a wide kinematic range and thus allows to access a wide range of reactions. Light mesons are studied with negative (mostly $\\pi^-$) and positive ($p$, $\\pi^+$) hadron beams with a momentum of 190 GeV/$c$. The spectrum of light mesons is investigated in various final states produced in diffractive dissociation reactions at squared four-momentum transfers to the target between 0.1 and 1.0 $(\\text{GeV}/c)^2$. The flagship channel is the $\\pi^-\\pi^+\\pi^-$ final state, for which COMPASS has recorded the currently largest data sample. These data not only allow to measure the properties of known resonances with high precision, but also to search for new states. Among these is a new resonance-like signal, t...

  9. Vector mesons in matter

    Indian Academy of Sciences (India)

    Gy Wolf

    2006-04-01

    One consequence of the chiral restoration is the mixing of parity partners. We look for a possible signature of the mixing of vector and axial vector mesons in heavy-ion collisions. We suggest an experimental method for its observation. The dynamical evolution of the heavy-ion collision is described by a transport equation of QMD-type evolving nucleons, * and resonances, ’s and $\\sum$ baryons, and furthermore, ’s, ’s ’s ’s ’s and kaons with their isospin degrees of freedom. The input cross-sections and resonance parameters of the model are fitted to the available nucleon–nucleon and pion–nucleon cross-sections.

  10. Couplings between the $\\rho$ and $D$- and $D^\\ast$-mesons

    CERN Document Server

    El-Bennich, Bruno; Roberts, Craig D; Rojas, Eduardo

    2016-01-01

    We compute couplings between the $\\rho$-meson and $D$- and $D^\\ast$-mesons - $D^{(\\ast)}\\rho D^{(\\ast)}$ - that are relevant to phenomenological meson-exchange models used to analyse nucleon-$D$-meson scattering and explore the possibility of exotic charmed nuclei. Our framework is built from elements constrained by Dyson-Schwinger equation studies in QCD, and therefore expresses a consistent, simultaneous description of light- and heavy-quarks and the states they constitute, We find that all interactions, including the three independent $D^{\\ast} \\rho \\,D^{\\ast}$ couplings, differ markedly amongst themselves in strength and also in range, as measured by their evolution with $\\rho$-meson virtuality. As a consequence, it appears that no single coupling strength or parametrization can realistically be employed in the study of interactions between $D^{(\\ast)}$-mesons and matter.

  11. Charm photoproduction via fragmentation

    International Nuclear Information System (INIS)

    The next-to-leading open charm production in γp collisions is calculated within the Perturbative Fragmentation Functions formalism, to allow resummation of αs log(pT2/m2) terms. In the large pT region (pT>m) the result is consistent with the fixed order NLO calculation, small discrepancies being found for very large pT and at the edge of phase space. The two approaches differ in the definition and the relative contribution of the direct and resolved terms, but essentially agree on their sum. The resummation is found to lead to a reduced sensitivity to the choice of the renormalization/factorization scale. (orig.)

  12. Evidence for a narrow anti-charmed baryon state

    OpenAIRE

    Aktas, A.; Andreev, V.; Anthonis, T.; Asmone, A.; Babaev, A.; Backovic, S.; Bahr, J.; Baranov, P; Barrelet, E.; Bartel, W.; Baumgartner, S.; J. Becker(Bochum Ruhr-University, Bochum, Germany); Beckingham, M.; Behnke, O.; Behrendt, O.

    2004-01-01

    A narrow resonance in D*- p and D*+ pbar invariant mass combinations is observed in inelastic electron-proton collisions at centre-of-mass energies of 300 GeV and 320 GeV at HERA. The resonance has a mass of 3099 \\pm 3 (stat.) \\pm 5 (syst.) MeV and a measured Gaussian width of 12 \\pm 3 (stat.) MeV, compatible with the experimental resolution. The resonance is interpreted as an anti-charmed baryon with a minimal constituent quark composition of uuddcbar, together with the chA narrow resonance ...

  13. Probing new physics in charm couplings with flavor-changing neutral currents

    International Nuclear Information System (INIS)

    Low-energy experiments involving kaon, B-meson, D-meson, and hyperon flavor-changing neutral transitions have confirmed the loop-induced flavor-changing neutral current picture of the standard model. The continuing study of these processes is essential to further refine this picture and ultimately understand the flavor dynamics. In this paper we consider deviations from the standard model in the charm sector and their effect on flavor-changing neutral current processes. Specifically, we parametrize new physics in terms of left- and right-handed anomalous couplings of the W boson to the charm quark. We present a comprehensive study of existing constraints and point out those measurements that are most sensitive to new physics of this type.

  14. Hunting for exotic doubly hidden-charm/bottom tetraquark states

    CERN Document Server

    Chen, Wei; Liu, Xiang; Steele, T G; Zhu, Shi-Lin

    2016-01-01

    We extend a moment QCD sum rule method to study the existence of exotic doubly hidden-charm/bottom tetraquark states made of four heavy quarks. Using the compact diquark-antidiquark configuration, we calculate the mass spectra of these tetraquark states. There are 18 hidden-charm $cc\\bar c\\bar c$ tetraquark currents with $J^{PC} = 0^{++}$, $0^{-+}$, $0^{--}$, $1^{++}$, $1^{+-}$, $1^{-+}$, $1^{--}$, and $2^{++}$. We use them to perform QCD sum rule analyses, and the obtained masses are all higher than the spontaneous dissociation thresholds of two charmonium mesons, which are thus their dominant decay modes. The masses of the corresponding hidden-bottom $bb\\bar b\\bar b$ tetraquarks are all below or very close to the thresholds of the $\\Upsilon(1S)\\Upsilon(1S)$ and $\\eta_b(1S)\\eta_b(1S)$, except one current of $J^{PC}=0^{++}$. Hence, we suggest to search for the doubly hidden-charm states in the $J/\\psi J/\\psi$ and $\\eta_c(1S)\\eta_c(1S)$ channels.

  15. Search for backwards produced exotic meson resonances and study of particle spectra and mass distributions in the reaction π+ + P → n (forward) + X++ at 8.4 GeV/c

    International Nuclear Information System (INIS)

    Results are reported from a hybrid experiment designed to search for backwards produced I = 2 exotic meson resonances by investigating the backward scattering reactions: π+ + p → in (forward) + π+π+, π+π+π+π-, π+π+π+π+π-π-, and p anti pπ+π+ at an incident pion momentum of 8.4 GeV/c. The SLAC 15'' rapid cycling bubble chamber, operating at 20 cycles per second, was triggered by detecting fast forward neutrons in an optical spark chamber and scintillation counter array downstream. Following two-component duality arguments, Jacob and Weyers and Rosner have suggested backward scattering processes as a favored mode for exotic meson resonance production. Upper limits of the order of one microbarn are reported for the production of narrow exotic meson resonances with masses less than or equal to 3 GeV and which could decay into even G-parity states: π+π+, π+π+π+π-, π+π+π+π+π-π-, and p anti pπ+π+. The mass resolution in the above channels varied from 5 to 30 MeV over the mass range for the most restrictive sample of events. The statistical significance of the data corresponds to 30 events per microbarn. Evidence for forward N* and rho0 production are also reported. The main features of the data can be simulated by a Monte Carlo model which incorporates Lorentz-invariant phase space modified by exponential transverse momentum damping on each final state particle and, in addition, takes into account the geometrical constraints and trigger requirements of the experiment

  16. Measurement of the forward-backward asymmetry of charm quark production in e sup + e sup - annihilations at < radical s>=58. 4 GeV

    Energy Technology Data Exchange (ETDEWEB)

    Okamoto, A.; Abe, K.; Amako, K.; Arai, Y.; Asano, Y.; Chiba, M.; Chiba, Y.; Daigo, M.; Fukawa, M.; Fukui, T.; Fukushima, Y.; Haba, J.; Hemmi, Y.; Higuchi, M.; Hinode, F.; Hirose, T.; Hojo, Y.; Homma, Y.; Hoshi, Y.; Ishihara, N.; Kamitani, T.; Kanematsu, N.; Kanda, N.; Kanzaki, J.; Kikuchi, R.; Kondo, T.; Korhonen, T.T.; Koseki, T.; Kurashige, H.; MacNaughton, J.; Matsui, T.; Minami, M.; Miyake, K.; Mori, K.; Nagashima, Y.; Nakamura, T.; Nakano, I.; Narita, Y.; Odaka, S.; Ogawa, K.; Ohama, T.; Ohsugi, T.; Ono, A.; Oyama, T.; Sakamoto, H.; Sakuda, M.; Sasao, N.; Sato, M.; Sato, N.; Shibuya, H.; Shioden, M.; Shirai, J.; Shirakata, S.; Sugimoto, S.; Sumiyoshi, T.; Suzuki, A.; Takada, Y.; Takaki, H.; Takasaki, F.; Taketani, A.; Takita, M.; Tamura, N.; Terunuma, N.; Tobimatsu, K.; Tsuboyama, T.; Uehara, S.; Unno, Y.; Utsumi, M.; Watanabe, T.; Watase, Y.; Yabuki, F.; Yamada, Y.; Yonezawa, Y.; Yoshida, H. (Dept. of Physics, Kyoto Univ. (Japan) Dept. of Physics, Tohoku Univ., Sendai (Japan) KE; VENUS Collaboration

    1992-03-26

    The forward-backward asymmetry of charm quark production has been measured at an average energy of 58.4 GeV with the VENUS detector at the TRISTAN e{sup +}e{sup -} collider. The charm quarks were identified through reconstruction of charged D{sup *} mesons using the mass difference between the D{sup *} and D{sup 0} mesons. The measured charge asymmetry, -0.49(+0.19-0.17){+-}0.04, is consistent with the prediction of the standard theory. The corresponding axial-vector coupling constant is 1.03(+0.40-0.35){+-}0.07. (orig.).

  17. Measurement of the forward-backward asymmetry of charm quark production in e+e- annihilations at =58.4 GeV

    International Nuclear Information System (INIS)

    The forward-backward asymmetry of charm quark production has been measured at an average energy of 58.4 GeV with the VENUS detector at the TRISTAN e+e- collider. The charm quarks were identified through reconstruction of charged D* mesons using the mass difference between the D* and D0 mesons. The measured charge asymmetry, -0.49(+0.19-0.17)±0.04, is consistent with the prediction of the standard theory. The corresponding axial-vector coupling constant is 1.03(+0.40-0.35)±0.07. (orig.)

  18. New results on CLEO`s heavy quarks - bottom and charm

    Energy Technology Data Exchange (ETDEWEB)

    Menary, S. [Univ. of California, Santa Barbara, CA (United States)

    1997-01-01

    While the top quark is confined to virtual reality for CLEO, the increased luminosity of the Cornell Electron Storage Ring (CESR) and the improved photon detection capabilities of the CLEO`s {open_quotes}heavy{close_quotes} quarks - bottom and charm. I will describe new results in the B meson sector including the first observation of exclusive b {yields} ulv decays, upper limits on gluonic penguin decay rates, and precise measurements of semileptonic and hadronic b {yields} c branching fractions. The charmed hadron results that are discussed include the observation of isospin violation in D{sub s}*{sup +} decays, an update on measurements of the D{sub s}{sup +} decay constant, and the observation of a new excited {Xi}{sub c} charmed baryon. These measurements have had a large impact on our understanding of heavy quark physics.

  19. Status of charm flavor physics

    OpenAIRE

    Shipsey, I.

    2006-01-01

    The role of charm in testing the Standard Model description of quark mixing and CP violation through measurements of lifetimes, decay constants and semileptonic form factors is reviewed. Together with Lattice QCD, charm has the potential this decade to maximize the sensitivity of the entire flavor physics program to new physics. and pave the way for understanding physics beyond the Standard Model at the LHC in the ...

  20. A model of charmed baryon-nucleon potential and 2- and 3-body bound states with charmed baryon

    CERN Document Server

    Maeda, Saori; Yokota, Akira; Hiyama, Emiko; Liu, Yan-Rui

    2015-01-01

    Potential models of the interaction between a charmed baryon ($Y_c$) and the nucleon ($N$) are constructed on the basis of a long-range meson ($\\pi$ and $\\sigma$) exchange potential as well as a short-distance quark exchange interaction. The quark cluster model is used to evaluate the short-range repulsion between $Y_c$ and $N$, while the meson exchange potentials are modified by a form factor at short distances. We determine the cutoff parameters of the form factors so as to fit the $NN$ scattering data with the same approach. The ground state charmed baryons, $\\Lambda_c$, $\\Sigma_c$ and $\\Sigma_c^*$, are included as $Y_c$, and channel couplings of relevant $Y_c N$ channels are taken into account. We propose four sets of parameters (a -- d), among which the most attractive potential (d) predicts bound $\\Lambda_c N$ $J^\\pi= 0^+$ and $1^+$ states. In order to apply the potential to a many-body problem, we construct an effective $\\Lambda_c N$ one-channel potential for the parameter set (d). It is applied to the...

  1. Scalar and axial-vector mesons

    CERN Document Server

    Van Beveren, E; Beveren, Eef van; Rupp, George

    2007-01-01

    Nowadays, there exists an abundance of theoretical approaches towards the mesonic spectrum, ranging from confinement models of all kinds, i.e., glueballs, and quark-antiquark, multiquark and hybrid configurations, to models in which only mesonic degrees of freedom are taken into account. Nature seems to come out somewhere in the middle, neither preferring pure bound states, nor effective meson-meson physics with only coupling constants and possibly form factors. As a matter of fact, apart from a few exceptions, like pions and kaons, Nature does not allow us to study mesonic bound states of any kind, which is equivalent to saying that such states do not really exist. Hence, instead of extrapolating from pions and kaons to the remainder of the meson family, it is more democratic to consider pions and kaons mesonic resonances that happen to come out below the lowest threshold for strong decay. Nevertheless, confinement is an important ingredient for understanding the many regularities observed in mesonic spectra...

  2. First lattice calculation of charmed hadrons' electromagnetic form factors

    International Nuclear Information System (INIS)

    Electromagnetic form factors of D and D* mesons and Ξcc, Σc, Ωc and Ωcc baryons are calculated in 2+1 flavor lattice QCD. As a by product of this calculation electric/magnetic charge radii and magnetic moments are extracted. Compared to the PDG values of the light- sector, i.e. pion and proton, charmed hadron results are systematically smaller

  3. Charmed spectroscopy from a nonperturbatively determined relativistic heavy quark action in full QCD

    Energy Technology Data Exchange (ETDEWEB)

    Huey-Wen Lin

    2006-07-28

    We present a preliminary calculation of the charmed meson spectrum using the 2+1 flavor domain wall fermion lattice configurations currently being generated by the RBC and UKQCD collaborations. The calculation is performed using the 3-parameter, relativistic heavy quark action with nonperturbatively determined coefficients. We will also demonstrate a step-scaling procedure for determining these coefficients nonperturbatively using a series of quenched, gauge field ensembles generated for three different lattice spacings.

  4. Photo- and hadro-production of charm and beauty at Fermilab

    International Nuclear Information System (INIS)

    This report concentrates on results from three Fermilab experiments: the photoproduction of charm in the fixed target mode from experiment E687, and the collider hadroproduction of b-quarks and B-mesons as measured respectively by the D0 and CDF detectors. Only the production of open flavors is considered. For heavy quarkonia results see the contribution from B. Naroska to these proceedings

  5. Single electrons from heavy-flavor mesons in relativistic heavy-ion collisions

    CERN Document Server

    Song, Taesoo; Torres-Rincon, Juan M; Tolos, Laura; Cabrera, Daniel; Cassing, Wolfgang; Bratkovskaya, Elena

    2016-01-01

    We study the single electron spectra from D and B meson semileptonic decays in Au+Au collisions at 200, 62.4, and 19.2 GeV by employing the PHSD transport approach that has been shown to reasonably describe the charm dynamics at RHIC and LHC energies on a microscopic level. In this approach the initial charm and bottom quarks are produced by using the PYTHIA event generator which is tuned to reproduce the FONLL calculations for charm and bottom production. The produced charm and bottom quarks interact with off-shell massive partons in the quark-gluon plasma with scattering cross sections which are calculated in the DQPM that is matched to reproduce the equation of state of the partonic system above the deconfinement temperature $T_c$. At energy densities close to the critical energy density the charm and bottom quarks are hadronized into D and B mesons through either coalescence or fragmentation. After hadronization the D and B mesons interact with the light hadrons by employing the scattering cross sections ...

  6. THE ETA-MESON PHOTOPRODUCTION ON PROTON

    Czech Academy of Sciences Publication Activity Database

    Donoval, Jan; Bydžovský, Petr

    2011-01-01

    Roč. 26, 3-4 (2011), s. 645-646. ISSN 0217-751X. [11th International Workshop on Meson Production, Properties and Interaction. Krakow, 10.06.2010-15.06.2010] R&D Projects: GA ČR GA202/08/0984 Institutional research plan: CEZ:AV0Z10480505 Keywords : Eta-meson photoproduction * form factors * nucleon resonances Subject RIV: BG - Nuclear, Atomic and Molecular Physics , Colliders Impact factor: 1.053, year: 2011

  7. The interactions of heavy mesons with nuclei

    International Nuclear Information System (INIS)

    Data obtained from interactions of heavy mesons with nuclei is reviewed. Nucleon-nucleon reactions followed by p + d (or d+p) reactions and nucleon-nucleus reactions are described. A meson decay experiment is discussed. The fundamental importance of S11 (1535) in η-nucleon is stressed. The propagation of resonances through nuclear matter is considered. Improvements in this research field require the developement of a new accelerator generation

  8. On charmed particle hadronic production

    International Nuclear Information System (INIS)

    Msub(anti Q)-meson production in hadron-hadron collisions resulting from anti Q quark recombination with valence quark qsub(V) from incident hadron has been considered. The cross section for Msub(anti Q) meson production is obtained. Proceeding from the short-range interaction in the rapidity space a method is proposed to calculate inclusive differential spectra of Λsub(Q) baryons using the known Msub(anti Q) meson spectra

  9. Survival of Bc mesons in a hot plasma within a potential model

    CERN Document Server

    Alberico, W M; Czerski, P; De Pace, A; Nardi, M; Ratti, C

    2013-01-01

    We extend a previous work on the study of heavy charmonia and bottomonia in a deconfined quark-gluon plasma by considering the Bc family of mesons. With the introduction of this bound state of a charm and a beauty quark, we investigate at finite temperature the behavior of the quarkonium, in an energy region between the {\\psi} and the {\\Upsilon} states.

  10. Study of Orbitally Excited $B_{(s)}$ Mesons and Evidence for a New $B\\pi$ Resonance with the CDF II Detector

    Energy Technology Data Exchange (ETDEWEB)

    Kambeitz, Manuel [Karlsruhe Institute of Technology (Germany)

    2014-12-05

    This thesis presents an analysis of excited states of B0, B+ and B0 s mesons, decaying to B mesons while emitting a pion or kaon. They are reconstructed from their decay products and a selection is performed to discard wrongly reconstructed B(s) mesons with the multivariate analysis software NeuroBayes, as described in chapter 5. In the training process, the sPlot method and measured and simulated data are used. Chapter 6 describes how the properties of excited B(s) are determined by an unbinned maximum likelihood t to their mass spectra. The systematic uncertainties determined in this analysis are described in chapter 7. The results of this thesis are presented in chapter 8 and a conclusion is given in chapter 9. The results shown in this thesis have been published before in [1].

  11. Determination of the D mesons lifetimes

    International Nuclear Information System (INIS)

    The results from the experiment NA27, performed in the North Area of the Super Proton Synchrotron at CERN are presented. The experimental set up was the small, high resolution, rapid cyling bubble chamber LEBC coupled with the European Hybrid Spectrometer (EHS). More than 2 millions pictures were taken, with 1015000 in teractions in hydrogen. The stastistical sensitivity of the experiment was 38.5 events/μb. A clean sample of 700 charm particle decays was obtained. Estimators with minimal systematic and statistical errors are developed for the determination of the lifetimes of short-lived particles whose individual momenta are unknown. These estimators make use of the measured decay lengths and the a priori known production characteristics. In this way, it is possible to include identified but not fully reconstructed charm decays in the sample to determine their lifetime. The properties of these estimators were extensively studied by means of Montecarlo simulation. The detection of the short-lived particles through the impact parameter of their charged decay products leads to additional complications which are taken into account. The biases and statistical errors inherent in using simpler approximate lifetime estimators are also discussed. These estimators are applied to determine the lifetime of the Do and D+- mesons using the charm data sample from NA27. (Author)

  12. Meson Spectroscopy at JLab-12 GeV

    International Nuclear Information System (INIS)

    Meson, being the simplest hadronic bound system, is the ideal 'laboratory' to study the interaction between quarks, to understand the role of the gluons inside hadrons and to investigate the origin of color confinement. To perform such studies it is important to measure the meson spectrum, with precise determination of resonance masses and properties, looking for rare q q-bar states and for unconventional mesons with exotic quantum numbers (i.e. mesons with quantum numbers that are not compatible with a q q-bar structure). With the imminent advent of the 12 GeV upgrade of Jefferson Lab a new generation of meson spectroscopy experiments will start: 'Meson-Ex' in Hall B and 'GLUEX' in Hall D. Both will use photo-production to explore the spectrum of mesons in the light-quark sector, in the energy range of few GeVs.

  13. Meson Spectroscopy at JLab@12 GeV

    Energy Technology Data Exchange (ETDEWEB)

    Celentano, Andrea [INFN-GENOVA

    2013-03-01

    Meson, being the simplest hadronic bound system, is the ideal "laboratory" to study the interaction between quarks, to understand the role of the gluons inside hadrons and to investigate the origin of color confinement. To perform such studies it is important to measure the meson spectrum, with precise determination of resonance masses and properties, looking for rare qbar q states and for unconventional mesons with exotic quantum numbers (i.e. mesons with quantum numbers that are not compatible with a qbar q structure). With the imminent advent of the 12 GeV upgrade of Jefferson Lab a new generation of meson spectroscopy experiments will start: "Meson-Ex" in Hall B and "GLUEX" in Hall D. Both will use photo-production to explore the spectrum of mesons in the light-quark sector, in the energy range of few GeVs.

  14. Exclusive Semileptonic Decays of B Mesons to Orbitally and Radial Excited D

    CERN Document Server

    Di Pierro, Massimo; Pierro, Massimo Di; Leibovich, Adam K.

    2002-01-01

    In this paper we compute, within in the context of a relativistic quark model, the Isgur-Wise functions for exclusive semileptonic $\\bar B \\to X_c$ decays, where $X_c$ is any charmed mesons with total spin $J=0,1,2$ or one of their first excited states. The relevant matrix elements are computed by a direct numerical integration, in coordinate space, of the convolution of the wave function of the $B$ meson at rest and the wave function of the $X_c$ meson, boosted according with its recoil factor. Our results are compared with other predictions found in the existing literature.

  15. Charm and beauty production at LHC

    CERN Document Server

    Carrer, N

    2003-01-01

    We define here the present ALICE baseline for what concerns the heavy flavour production cross sections at LHC and the kinematical distributions of the heavy quark pairs. We start by qualitatively assessing the Bjorken x regimes accessible with charm and beauty measurements at LHC with ALICE (Section 1). In Section 2 we report the most recent results (and the uncertainties) of the next-to-leading order (NLO) pQCD calculations for the cross sections in pp collisions at LHC energies. These results are extrapolated to Pb-Pb collisions in Section 3.1 and to p-Pb collisions in Section 3.2, taking into account nuclear shadowing and parton intrinsic transverse momentum broadening. Heavy quark kinematics as given by the NLO pQCD calculation are reported in Section 4. We tuned the PYTHIA event generator in order to reproduce such results for what concerns the c and b quarks transverse momentum distributions (Section 5). Finally, we report the yields and transverse momentum distributions for D and B mesons (section 6).

  16. Meson Spectroscopy at COMPASS

    CERN Document Server

    ,

    2016-01-01

    The goal of the COMPASS experiment at CERN is to study the structure and dynamics of hadrons. The two-stage spectrometer used by the experiment has large acceptance and covers a wide kinematic range for charged as well as neutral particles and can therefore measure a wide range of reactions. The spectroscopy of light mesons is performed with negative (mostly $\\pi^-$) and positive ($p$, $\\pi^+$) hadron beams with a momentum of 190 GeV/$c$. The light-meson spectrum is measured in different final states produced in diffractive dissociation reactions with squared four-momentum transfer $t$ to the target between 0.1 and 1.0 $(\\text{GeV}/c)^2$. The flagship channel is the $\\pi^-\\pi^-\\pi^+$ final state, for which COMPASS has recorded the currently world's largest data sample. These data not only allow to measure the properties of known resonances with high precision, but also to observe new states. Among these is a new axial-vector signal, the $a_1(1420)$, with unusual properties. Novel analysis techniques have been...

  17. Charms of radiation research

    International Nuclear Information System (INIS)

    Most of my professional efforts over nearly five decades have been devoted to radiation research, that is, studies of the physical, chemical, and biological actions of high-energy radiation on matter. (By the term high-energy radiation'' I mean here x rays, γ rays, neutrons, and charged particles of high enough energies to produce ionization in manner. I exclude visible light, infrared waves, microwaves, and sound waves.) Charms of radiation research lie in its interdisciplinary character, although my training was in basic physics, the scope of my interest has gradually increased to cover many other areas, to my deep satisfaction. High-energy radiation is an important component of the universe, and of our environment. It often provides an effective avenue for characterizing matter and understanding its behavior. Near Earth's surface this radiation is normally present in exceptionally low quantity, and yet it plays a significant role in some atmospheric phenomena such as auroras, and also in the evolution of life. The recent advent of various devices for producing high-energy radiation has opened up the possibility of many applications, including medical and industrial uses. I have worked on some aspects of those uses. At every opportunity to address a broad audience I try to convey a sense of intellectual fun, together with some of the elements of the basic science involved. A goal of radiation education might be to make the word radiation'' as common and familiar as words such as ''fire'' and electricity'' through increased usage. (author)

  18. Evidence for a Narrow Anti-Charmed Baryon State

    CERN Document Server

    Aktas, A; Anthonis, T; Asmone, A; Babaev, A; Backovic, S; Bähr, J; Baranov, P; Barrelet, E; Bartel, Wulfrin; Baumgartner, S; Becker, J; Beckingham, M; Behnke, O; Behrendt, O; Belousov, A; Berger, C; Berger, N; Berndt, T; Bizot, J C; Böhme, J; Boenig, M O; Boudry, V; Bracinik, J; Brisson, V; Broker, H B; Brown, D P; Bruncko, Dusan; Büsser, F W; Bunyatyan, A; Buschhorn, G; Bystritskaya, L; Campbell, A J; Caron, S; Cassol-Brunner, F; Cerny, K; Chekelian, V; Collard, Caroline; Contreras, J G; Coppens, Y R; Coughlan, J A; Cox, B E; Cozzika, G; Cvach, J; Dainton, J B; Dau, W D; Daum, K; Delcourt, B; Demirchyan, R; de Roeck, A; Desch, Klaus; De Wolf, E A; Diaconu, C; Dingfelder, J; Dodonov, V; Dubak, A; Duprel, C; Eckerlin, G; Efremenko, V; Egli, S; Eichler, R; Eisele, F; Ellerbrock, M; Elsen, E; Erdmann, M; Erdmann, W; Faulkner, P J W; Favart, L; Fedotov, A; Felst, R; Ferencei, J; Fleischer, M; Fleischmann, P; Fleming, Y H; Flucke, G; Flügge, G; Fomenko, A; Foresti, I; Formánek, J; Franke, G; Frising, G; Gabathuler, Erwin; Gabathuler, K; Garutti, E; Garvey, J; Gayler, J; Gerhards, R; Gerlich, C; Ghazaryan, S; Glazov, A; Görlich, L; Gogitidze, N; Gorbounov, S; Grab, C; Grässler, Herbert; Greenshaw, T; Gregori, M; Grindhammer, G; Gwilliam, C; Haidt, D; Hajduk, L; Haller, J; Hansson, M; Heinzelmann, G; Henderson, R C W; Henschel, H; Henshaw, O; Heremans, R; Herrera-Corral, G; Herynek, I; Heuer, R D; Hildebrandt, M; Hiller, K H; Hoting, P; Hoffmann, D; Horisberger, R P; Hovhannisyan, A; Ibbotson, M; Ismail, M; Jacquet, M; Janauschek, L; Janssen, X; Jemanov, V; Jönsson, L B; Johnson, D P; Jung, H; Kant, D; Kapichine, M; Karlsson, M; Katzy, J; Keller, N; Kennedy, J; Kenyon, I R; Kiesling, C; Klein, M; Kleinwort, C; Klimkovich, T; Kluge, T; Knies, G; Knutsson, A; Koblitz, B; Korbel, V; Kostka, P; Koutouev, R; Kropivnitskaya, A; Kroseberg, J; Kuckens, J; Kuhr, T; Landon, M P J; Lange, W; Lastoviicka, T; Laycock, P; Lebedev, A; Leiner, B; Lemrani, R; Lendermann, V; Levonian, S; Lindfeld, L; Lipka, K; List, B; Lobodzinska, E; Loktionova, N A; López-Fernandez, R; Lubimov, V; Lüders, H; Lüke, D; Lux, T; Lytkin, L; Makankine, A; Malden, N; Malinovskii, E I; Mangano, S; Marage, P; Marks, J; Marshall, R; Martisikova, M; Martyn, H U; Maxfield, S J; Meer, D; Mehta, A; Meier, K; Meyer, A B; Meyer, H; Meyer, J; Michine, S; Mikocki, S; Milcewicz, I; Milstead, D; Mohamed, A; Moreau, F; Morozov, A; Morozov, I; Morris, J V; Mozer, M U; Müller, K; Murn, P; Nagovizin, V; Naroska, Beate; Naumann, J; Naumann, T; Newman, P R; Niebuhr, C B; Nikiforov, A; Nikitin, D K; Nowak, G; Nozicka, M; Oganezov, R; Olivier, B; Olsson, J E; Ossoskov, G; Ozerov, D; Pascaud, C; Patel, G D; Peez, M; Pérez, E; Perieanu, A; Petrukhin, A; Pitzl, D; Placakyte, R; Pöschl, R; Portheault, B; Povh, B; Raicevic, N; Ratiani, Z; Reimer, P; Reisert, B; Rimmer, A; Risler, C; Rizvi, E; Robmann, P; Roland, B; Roosen, R; Rostovtsev, A A; Rurikova, Z; Rusakov, S V; Rybicki, K; Sankey, D P C; Sauvan, E; Schatzel, S; Scheins, J; Schilling, F P; Schleper, P; Schmidt, S; Schmitt, S; Schneider, M; Schoeffel, L; Schöning, A; Schröder, V; Schultz-Coulon, H C; Schwanenberger, C; Sedlak, K; Sefkow, F; Shevyakov, I; Shtarkov, L N; Sirois, Y; Sloan, T; Smirnov, P; Soloviev, Yu; South, D; Spaskov, V; Specka, A; Spitzer, H; Stamen, R; Stella, B; Stiewe, J; Strauch, I; Straumann, U; Tchoulakov, V; Thompson, G; Thompson, P D; Tomasz, F; Traynor, D; Truöl, P; Tsipolitis, G; Tsurin, I; Turnau, J; Tzamariudaki, E; Uraev, A; Urban, M; Usik, A; Utkin, D; Valkár, S; Valkárová, A; Vallée, C; Van Mechelen, P; Van, N; Remortel; Vargas-Trevino, A; Vazdik, Ya A; Veelken, C; Vest, A; Vinokurova, S; Volchinski, V; Wacker, K; Wagner, J; Weber, G; Weber, R; Wegener, D; Werner, C; Werner, N; Wessels, M; Wessling, B; Winter, G G; Wissing, C; Woerling, E E; Wolf, R; Wünsch, E; Xella, S M; Yan, W; Yeganov, V; Zaicek, J; Zaleisak, J; Zhang, Z; Zhokin, A; Zohrabyan, H G; Zomer, F

    2004-01-01

    A narrow resonance in D*- p and D*+ pbar invariant mass combinations is observed in inelastic electron-proton collisions at centre-of-mass energies of 300 GeV and 320 GeV at HERA. The resonance has a mass of 3099 \\pm 3 (stat.) \\pm 5 (syst.) MeV and a measured Gaussian width of 12 \\pm 3 (stat.) MeV, compatible with the experimental resolution. The resonance is interpreted as an anti-charmed baryon with a minimal constituent quark composition of uuddcbar, together with the charge conjugate.

  19. Evidence for a narrow anti-charmed baryon state

    Science.gov (United States)

    Aktas, A.; Andreev, V.; Anthonis, T.; Asmone, A.; Babaev, A.; Backovic, S.; Bähr, J.; Baranov, P.; Barrelet, E.; Bartel, W.; Baumgartner, S.; Becker, J.; Beckingham, M.; Behnke, O.; Behrendt, O.; Belousov, A.; Berger, Ch.; Berger, N.; Berndt, T.; Bizot, J. C.; Böhme, J.; Boenig, M.-O.; Boudry, V.; Bracinik, J.; Brisson, V.; Bröker, H.-B.; Brown, D. P.; Bruncko, D.; Büsser, F. W.; Bunyatyan, A.; Buschhorn, G.; Bystritskaya, L.; Campbell, A. J.; Caron, S.; Cassol-Brunner, F.; Cerny, K.; Chekelian, V.; Collard, C.; Contreras, J. G.; Coppens, Y. R.; Coughlan, J. A.; Cox, B. E.; Cozzika, G.; Cvach, J.; Dainton, J. B.; Dau, W. D.; Daum, K.; Delcourt, B.; Demirchyan, R.; De Roeck, A.; Desch, K.; De Wolf, E. A.; Diaconu, C.; Dingfelder, J.; Dodonov, V.; Dubak, A.; Duprel, C.; Eckerlin, G.; Efremenko, V.; Egli, S.; Eichler, R.; Eisele, F.; Ellerbrock, M.; Elsen, E.; Erdmann, M.; Erdmann, W.; Faulkner, P. J. W.; Favart, L.; Fedotov, A.; Felst, R.; Ferencei, J.; Fleischer, M.; Fleischmann, P.; Fleming, Y. H.; Flucke, G.; Flügge, G.; Fomenko, A.; Foresti, I.; Formánek, J.; Franke, G.; Frising, G.; Gabathuler, E.; Gabathuler, K.; Garutti, E.; Garvey, J.; Gayler, J.; Gerhards, R.; Gerlich, C.; Ghazaryan, S.; Glazov, A.; Goerlich, L.; Gogitidze, N.; Gorbounov, S.; Grab, C.; Grässler, H.; Greenshaw, T.; Gregori, M.; Grindhammer, G.; Gwilliam, C.; Haidt, D.; Hajduk, L.; Haller, J.; Hansson, M.; Heinzelmann, G.; Henderson, R. C. W.; Henschel, H.; Henshaw, O.; Heremans, R.; Herrera, G.; Herynek, I.; Heuer, R.-D.; Hildebrandt, M.; Hiller, K. H.; Höting, P.; Hoffmann, D.; Horisberger, R.; Hovhannisyan, A.; Ibbotson, M.; Ismail, M.; Jacquet, M.; Janauschek, L.; Janssen, X.; Jemanov, V.; Jönsson, L.; Johnson, D. P.; Jung, H.; Kant, D.; Kapichine, M.; Karlsson, M.; Katzy, J.; Keller, N.; Kennedy, J.; Kenyon, I. R.; Kiesling, C.; Klein, M.; Kleinwort, C.; Klimkovich, T.; Kluge, T.; Knies, G.; Knutsson, A.; Koblitz, B.; Korbel, V.; Kostka, P.; Koutouev, R.; Kropivnitskaya, A.; Kroseberg, J.; Kückens, J.; Kuhr, T.; Landon, M. P. J.; Lange, W.; Laštovička, T.; Laycock, P.; Lebedev, A.; Leißner, B.; Lemrani, R.; Lendermann, V.; Levonian, S.; Lindfeld, L.; Lipka, K.; List, B.; Lobodzinska, E.; Loktionova, N.; Lopez-Fernandez, R.; Lubimov, V.; Lueders, H.; Lüke, D.; Lux, T.; Lytkin, L.; Makankine, A.; Malden, N.; Malinovski, E.; Mangano, S.; Marage, P.; Marks, J.; Marshall, R.; Martisikova, M.; Martyn, H.-U.; Maxfield, S. J.; Meer, D.; Mehta, A.; Meier, K.; Meyer, A. B.; Meyer, H.; Meyer, J.; Michine, S.; Mikocki, S.; Milcewicz, I.; Milstead, D.; Mohamed, A.; Moreau, F.; Morozov, A.; Morozov, I.; Morris, J. V.; Mozer, M. U.; Müller, K.; Murín, P.; Nagovizin, V.; Naroska, B.; Naumann, J.; Naumann, Th.; Newman, P. R.; Niebuhr, C.; Nikiforov, A.; Nikitin, D.; Nowak, G.; Nozicka, M.; Oganezov, R.; Olivier, B.; Olsson, J. E.; Ossoskov, G.; Ozerov, D.; Pascaud, C.; Patel, G. D.; Peez, M.; Perez, E.; Perieanu, A.; Petrukhin, A.; Pitzl, D.; Plačakyt≐, R.; Pöschl, R.; Portheault, B.; Povh, B.; Raicevic, N.; Ratiani, Z.; Reimer, P.; Reisert, B.; Rimmer, A.; Risler, C.; Rizvi, E.; Robmann, P.; Roland, B.; Roosen, R.; Rostovtsev, A.; Rurikova, Z.; Rusakov, S.; Rybicki, K.; Sankey, D. P. C.; Sauvan, E.; Schätzel, S.; Scheins, J.; Schilling, F.-P.; Schleper, P.; Schmidt, S.; Schmitt, S.; Schneider, M.; Schoeffel, L.; Schöning, A.; Schröder, V.; Schultz-Coulon, H.-C.; Schwanenberger, C.; Sedlák, K.; Sefkow, F.; Sheviakov, I.; Shtarkov, L. N.; Sirois, Y.; Sloan, T.; Smirnov, P.; Soloviev, Y.; South, D.; Spaskov, V.; Specka, A.; Spitzer, H.; Stamen, R.; Stella, B.; Stiewe, J.; Strauch, I.; Straumann, U.; Tchoulakov, V.; Thompson, G.; Thompson, P. D.; Tomasz, F.; Traynor, D.; Truöl, P.; Tsipolitis, G.; Tsurin, I.; Turnau, J.; Tzamariudaki, E.; Uraev, A.; Urban, M.; Usik, A.; Utkin, D.; Valkár, S.; Valkárová, A.; Vallée, C.; Van Mechelen, P.; Van Remortel, N.; Vargas Trevino, A.; Vazdik, Y.; Veelken, C.; Vest, A.; Vinokurova, S.; Volchinski, V.; Wacker, K.; Wagner, J.; Weber, G.; Weber, R.; Wegener, D.; Werner, C.; Werner, N.; Wessels, M.; Wessling, B.; Winter, G.-G.; Wissing, Ch.; Woehrling, E.-E.; Wolf, R.; Wünsch, E.; Xella, S.; Yan, W.; Yeganov, V.; Žáček, J.; Zálešák, J.; Zhang, Z.; Zhokin, A.; Zohrabyan, H.; Zomer, F.; H1 Collaboration

    2004-05-01

    A narrow resonance in D∗ -p and D∗ +p¯ invariant mass combinations is observed in inelastic electron-proton collisions at centre-of-mass energies of 300 GeV and 320 GeV at HERA. The resonance has a mass of 3099±3(stat.)±5(syst.) MeV and a measured Gaussian width of 12±3(stat.) MeV, compatible with the experimental resolution. The resonance is interpreted as an anti-charmed baryon with a minimal constituent quark composition of uuddc¯, together with the charge conjugate.

  20. Diffractive open charm production in deep-inelastic scattering and photoproduction at HERA

    International Nuclear Information System (INIS)

    Measurements are presented of diffractive open charm production at HERA. The event topology is given by ep→eXY where the system X contains at least one charmed hadron and is well separated by a large rapidity gap from a leading low-mass proton remnant system Y. Two analysis techniques are used for the cross section measurements. In the first, the charm quark is tagged by the reconstruction of a D*±(2010) meson. This technique is used in deep-inelastic scattering (DIS) and photoproduction (γp). In the second, a method based on the displacement of tracks from the primary vertex is used to measure the open charm contribution to the inclusive diffractive cross section in DIS. The measurements are compared with next-to-leading order QCD predictions based on diffractive parton density functions previously obtained from a QCD analysis of the inclusive diffractive cross section at H1. A good agreement is observed in the full kinematic regime, which supports the validity of QCD factorization for open charm production in diffractive DIS and γp. (orig.)

  1. Diffractive Open Charm Production in Deep-Inelastic Scattering and Photoproduction at HERA

    CERN Document Server

    Aktas, A; Anthonis, T; Antunovic, B; Aplin, S; Asmone, A; Astvatsatourov, A; Babaev, A; Backovic, S; Baghdasaryan, A; Baranov, P; Barrelet, E; Bartel, Wulfrin; Baudrand, S; Beckingham, M; Begzsuren, K; Behnke, O; Behrendt, O; Belousov, A; Berger, N; Bizot, J C; Boenig, M O; Boudry, V; Bozovic-Jelisavcic, I; Bracinik, J; Brandt, G; Brinkmann, M; Brisson, V; Bruncko, D; Bunyatyan, A; Buschhorn, G; Bystritskaya, L; Büsser, F W; Campbell, A J; Cantun Avila, K B; Cassol-Brunner, F; Cerny, K; Cerny, V; Chekelian, V; Contreras, J G; Coughlan, J A; Cox, B E; Cozzika, G; Cvach, J; Dainton, J B; Daum, K; De Boer, Y; De Wolf, E A; Del Degan, M; Delcourt, B; Diaconu, C; Dodonov, V; Dubak, A; Eckerlin, G; Efremenko, V; Egli, S; Eichler, R; Eisele, F; Eliseev, A; Elsen, E; Essenov, S; Falkewicz, A; Faulkner, P J W; Favart, L; Fedotov, A; Felst, R; Feltesse, J; Ferencei, J; Finke, L; Fleischer, M; Flucke, G; Fomenko, A; Franke, G; Frisson, T; Gabathuler, E; Garutti, E; Gayler, J; Ghazaryan, S; Ginzburgskaya, S; Glazov, A; Glushkov, I; Goettlich, M; Gogitidze, N; Gorbounov, S; Gouzevitch, M; Grab, C; Greenshaw, T; Gregori, M; Grell, B R; Grindhammer, G; Gwilliam, C; Görlich, L; Habib, S; Haidt, D; Hansson, M; Heinzelmann, G; Helebrant, C; Henderson, R C W; Henschel, H; Herrera-Corral, G; Hildebrandt, M; Hiller, K H; Hoffmann, D; Horisberger, R P; Hovhannisyan, A; Hreus, T; Hussain, S; Ibbotson, M; Jacquet, M; Janssen, X; Jemanov, V; Johnson, D P; Jung, A W; Jung, H; Jönsson, L B; Kapichine, M; Katzy, J; Kenyon, I R; Kiesling, C; Klein, M; Kleinwort, C; Klimkovich, T; Kluge, T; Knies, G; Knutsson, A; Korbel, V; Kostka, P; Krastev, K; Kretzschmar, J; Kropivnitskaya, A; Krämer, M; Krüger, K; Landon, M P J; Lange, W; Lastoviicka-Medin, G; Laycock, P; Lebedev, A; Leibenguth, G; Lendermann, V; Levonian, S; Lindfeld, L; Lipka, K; Liptaj, A; List, B; List, J; Loktionova, N; Lubimov, V; Lucaci-Timoce, A I; Lüders, H; Lytkin, L; López-Fernandez, R; Makankine, A; Malinovskii, E I; Marage, P; Marshall, R; Marti, L; Martisikova, M; Martyn, H U; Maxfield, S J; Mehta, A; Meier, K; Meyer, A B; Meyer, H; Meyer, J; Michels, V; Mikocki, S; Milcewicz-Mika, I; Mladenov, D; Mohamed, A; Moreau, F; Morozov, A; Morris, J V; Mozer, M U; Murn, P; Müller, K; Nankov, K; Naroska, B; Naumann, T; Newman, P R; Niebuhr, C; Nikiforov, A; Nowak, G; Nowak, K; Nozicka, M; Oganezov, R; Olivier, B; Olsson, J E; Osman, S; Ozerov, D; Palichik, V; Panagoulias, I; Pandurovic, M; Papadopoulou, T D; Pascaud, C; Patel, G D; Peng, H; Perez-Astudillo, D; Perieanu, A; Petrukhin, A; Picuric, I; Piec, S; Pitzl, D; Placakyte, R; Povh, B; Prideaux, P; Pérez, E; Rahmat, A J; Raicevic, N; Reimer, P; Rimmer, A; Risler, C; Rizvi, E; Robmann, P; Roland, B; Roosen, R; Rostovtsev, A; Rurikova, Z; Rusakov, S; Salvaire, F; Sankey, D P C; Sauter, M; Sauvan, E; Schmidt, S; Schmitt, S; Schmitz, C; Schoeffel, L; Schultz-Coulon, H C; Schöning, A; Sefkow, F; Shaw-West, R N; Shevyakov, I; Shtarkov, L N; Sloan, T; Smiljanic, I; Smirnov, P; Soloviev, Yu; South, D; Spaskov, V; Specka, A; Steder, M; Stella, B; Stiewe, J; Stoilov, A; Straumann, U; Sunar, D; Sykora, T; Tchoulakov, V; Thompson, G; Thompson, P D; Toll, T; Tomasz, F; Traynor, D; Trinh, T N; Truöl, P; Tsakov, I; Tsipolitis, G; Tsurin, I; Turnau, J; Tzamariudaki, E; Urban, K; Urban, M; Usik, A; Utkin, D; Valkárová, A; Vallée, C; Van Mechelen, P; Vargas-Trevino, A; Vazdik, Ya A; Vinokurova, S; Volchinski, V; Wacker, K; Weber, G; Weber, R; Wegener, D; Werner, C; Wessels, M; Wissing, C; Wolf, R; Wünsch, E; Xella, S M; Yan, W; Yeganov, V; Zaicek, J; Zaleisak, J; Zhang, Z; Zhelezov, A; Zhokin, A; Zhu, Y C; Zimmermann, J; Zimmermann, T; Zohrabyan, H; Zomer, F; de Roeck, A

    2007-01-01

    Measurements are presented of diffractive open charm production at HERA. The event topology is given by ep -> eX Y where the system X contains at least one charmed hadron and is well separated by a large rapidity gap from a leading low-mass proton remnant system Y. Two analysis techniques are used for the cross section measurements. In the first, the charm quark is tagged by the reconstruction of a D*(2010) meson. This technique is used in deep-inelastic scattering (DIS) and photoproduction. In the second, a method based on the displacement of tracks from the primary vertex is used to measure the open charm contribution to the inclusive diffractive cross section in DIS. The measurements are compared with next-to-leading order QCD predictions based on diffractive parton density functions previously obtained from a QCD analysis of the inclusive diffractive cross section at H1. A good agreement is observed in the full kinematic regime, which supports the validity of QCD factorization for open charm production in...

  2. A Tau-Charm Factory at CEBAF

    Energy Technology Data Exchange (ETDEWEB)

    Seth, K.K. [Northwestern Univ., Evanston, IL (United States)

    1994-04-01

    It is proposed that a Tau Charm Factory represents a natural extension of CEBAF into higher energy domains. The exciting nature of the physics of charm quarks and tau leptons is briefly reviewed and it is suggested that the concept of a linac-ring collider as a Tau Charm Factory at CEBAF should be seriously studied.

  3. Recent results on charm physics from Fermilab

    International Nuclear Information System (INIS)

    New high statistics, high resolution fixed target experiments producing 105 -106 fully reconstructed charm particles are allowing a detailed study of the charm sector. recent results on charm quark production from Fermilab fixed target experiments E-791, SELEX and FOCUS are presented. (author)

  4. Hadronic molecules with a D ¯ meson in a medium

    Science.gov (United States)

    Caramés, T. F.; Fontoura, C. E.; Krein, G.; Tsushima, K.; Vijande, J.; Valcarce, A.

    2016-08-01

    We study the effect of a hot and dense medium on the binding energy of hadronic molecules with open-charm mesons. We focus on a recent chiral quark-model-based prediction of a molecular state in the N D ¯ system. We analyze how the two-body thresholds and the hadron-hadron interactions are modified when quark and meson masses and quark-meson couplings change in a function of the temperature and baryon density according to predictions of the Nambu-Jona-Lasinio model. We find that in some cases the molecular binding is enhanced in medium as compared to their free-space binding. We discuss the consequences of our findings for the search for exotic hadrons in high-energy heavy-ion collisions as well as in the forthcoming facilities FAIR or J-PARC.

  5. Baryon and meson phenomenology in the extended Linear Sigma Model

    International Nuclear Information System (INIS)

    The vacuum phenomenology obtained within the so-called extended Linear Sigma Model (eLSM) is presented. The eLSM Lagrangian is constructed by including from the very beginning vector and axial-vector d.o.f., and by requiring dilatation invariance and chiral symmetry. After a general introduction of the approach, particular attention is devoted to the latest results. In the mesonic sector the strong decays of the scalar and the pseudoscalar glueballs, the weak decays of the tau lepton into vector and axial-vector mesons, and the description of masses and decays of charmed mesons are shown. In the baryonic sector the omega production in proton-proton scattering and the inclusion of baryons with strangeness are described.

  6. Tau and Charm physics highlights

    CERN Document Server

    Roudeau, Patrick

    2002-01-01

    In tau physics, we are at the frontier between the completion of the LEP program and the start of analyses from b-factories, which are expected to produce results in the coming years. Nice results from CLEO are steadily delivered in the meantime. For charm, impressive progress have been achieved by fixed target experiments in the search for CP violation and D^0 - \\bar D^0 oscillations. First results from b-factories demonstrate the power of these facilities in such areas. The novel measurement of the D* width by CLEO happens to be rather different from current expectations. The absence of a charm factory explains the lack or the very slow progress in the absolute scale determinations for charm decays.

  7. Nuclear dependence of charm production

    International Nuclear Information System (INIS)

    Using data taken by SELEX during the 1996-1997 fixed target run at Fermilab, we study the production of charmed hadrons on copper and carbon targets with Σ-, p, π-, and π+ beams. Parametrizing the dependence of the inclusive production cross section on the atomic number A as Aα, we determine α for D+, D0, Ds+, D+(2010), Λc+, and their respective anti-particles, as a function of their transverse momentum pt and scaled longitudinal momentum xF. Within our statistics there is no dependence of α on xF for any charm species for the interval 0.1 Fmeson=0.850±0.028. This is somewhat larger than the corresponding average αbaryon=0.755±0.016 for charm production by baryon beams (Σ-, p). (orig.)

  8. Quantum chromodynamics with infinite number of vector mesons

    International Nuclear Information System (INIS)

    It is supposed that families of vector mesons ρ, ψ, Υ contain an infinite number of resonances with gradually increasing widths. The asymptotic freedom requirement involves a relationship between the electronic width of a resonance and its mass derivative over the number. Using of this relationship it is shown that for the families of ψ and Υ mesons the moment from experimental function R(s)is egual to the sum of the moment from a bare quark loop and the edge term which arised from replacing of summation by integration. These equalities are fulfilled up to 1% for 60 moments in the ψ-meson family and up to 2% for 96 moments in the Υ-meson family. The electronic widths of the considered resonances and the ρ-meson mass are calculated

  9. Study of Zweig's rule using phi mesons in a broad band neutral beam

    International Nuclear Information System (INIS)

    A study of Zweig's rule using phi mesons in a high energy photon beam was performed. Measurement of the ratio sigma(γA → phi ππA)/sigma(γA → ωππA) = 0.10 +- 0.02 is taken as evidence that there is not as strong suppression as could be expected. Other ratios show strange particle production down from nonstrange particle production by a factor of twelve. Decays involving phi mesons are studied, and the only candidate seen is a four sigma effect in the mode two phis with a mass 2.15 GeV. F meson, charm pseudo-scalar meson and exotic vector mesons which might decay into phis are not seen. The phi prime is not seen with an upper limit sigma(γA → phi'A)B(phi' → K+K-π+π-) < 6 nb per nucleon

  10. Exclusive and inclusive weak decays of the B-meson

    Energy Technology Data Exchange (ETDEWEB)

    Grach, I.L.; Narodetskii, I.M.; Ter-Martirosyan, K.A. [Institute of Theor. and Exp. Phys., Moscow (Russian Federation); Simula, S. [Istituto Nazionale di Fisica Nucleare, Sezione Sanita, Viale Regina Elena 299, I-00161 Rome (Italy)

    1997-09-29

    A relativistic quark model is applied to the description of semileptonic and non-leptonic charmed decays of the B-meson. The exclusive semileptonic modes B{yields}Dl{nu}{sub l} and B{yields}D{sup *}l{nu}{sub l} are described through the universal Isgur-Wise form factor, which is calculated in terms of a constituent quark model wave function for the B-meson. Different approximations for the latter, either based on a phenomenological ansatz or derived from analyses of the meson spectra, are adopted. In particular, two wave functions, constructed via the Hamiltonian light-front formalism using a relativized and a non-relativistic constituent quark model, are considered, obtaining a link between standard spectroscopic quark models and the B-meson decay physics. The inclusive semileptonic and non-leptonic branching ratios are calculated within a convolution approach, inspired by the partonic model and involving the same B-meson wave function used for the evaluation of the exclusive semileptonic modes. Our results for the major branching ratios are consistent with available experimental data and the sum of all the calculated branchingratios turns out to be close to unity. In particular, we found that (i) a remarkable fraction ({proportional_to}35%) of semileptonic decay modes occur in non-D, non-D{sup *} final states; (ii) non-perturbative effects enhance the inclusive b{yields}c anti ud decay channels, with a sizable contribution provided by internal decays into heavy mesons and baryon-antibaryon pairs; the resulting reduction of the semileptonic branching ratio brings the theoretical prediction in agreement with the experimental value without increasing at the same time the charm counting. (orig.). 47 refs.

  11. CHARM 2010: Experiment Summary and Future Charm Facilities

    CERN Document Server

    Appel, Jeffrey A

    2010-01-01

    The CHARM 2010 meeting had over 30 presentations of experimental results, plus additional future facilities talks just before this summary talk. Since there is not enough time even to summarize all that has been shown from experiments and to recognize all the memorable plots and results, this summary will give a few personal observations, an overview at a fairly high level of abstraction.

  12. Scalar mesons in a linear sigma model with (axial-)vector mesons

    CERN Document Server

    Parganlija, D; Wolf, Gy; Giacosa, F; Rischke, D H

    2012-01-01

    The structure of the scalar mesons has been a subject of debate for many decades. In this work we look for $\\bar{q}q$ states among the physical resonances using an extended Linear Sigma Model that contains scalar, pseudoscalar, vector, and axial-vector mesons both in the non-strange and strange sectors. We perform global fits of meson masses, decay widths and amplitudes in order to ascertain whether the scalar $\\bar{q}q$ states are below or above 1 GeV. We find the scalar states above 1 GeV to be preferred as $\\bar{q}q$ states.

  13. Meson assisted dibaryons

    CERN Document Server

    Gal, Avraham

    2015-01-01

    We discuss a new type of L=0 positive-parity dibaryons, pion-B-B', where the dominant binding mechanism is provided by resonating p-wave pion-baryon interactions. Recent calculations of such pion assisted dibaryons are reviewed with special emphasis placed on the non-strange I(JP)=1(2+) N-Delta dibaryon D_{12}(2150) studied recently at JLab, and on the 0(3+) Delta-Delta dibaryon D_{03}(2380) discovered recently by the WASA-at-COSY Collaboration. We review recent searches by the HADES Collaboration at GSI and by the E15 and E27 Experiments at J-PARC for a strangeness S=-1 I(JP)=1/2(0-) K-pp dibaryon and perhaps also for a strange I(JP)=3/2(2+) N-Sigma(1385) pion assisted dibaryon Y_{3/2(2+)}(2270). Charm C=+1 dibaryons, predicted with these same I(JP) values, are also briefly reviewed.

  14. Description of the a0/f0 mesons with the Juelich model

    International Nuclear Information System (INIS)

    Recently we have developed meson-exchange models for ππ and πη scattering and we have used them for investigating the nature of the meson resonances f0(980) and a0(980). These models are based on an effective meson Lagrangian utilising the symmetries of the QCD-Lagrangian as guideline. The resulting potential for meson-meson scattering contains t-channel vector-meson exchanges (ρ, K*, ω, φ) as well as s-channel pole diagrams (ρ, element of (1400), f2(1270)) and is iterated in a three-dimensional scattering equation of Blankenbecler-Sugar type. (orig.)

  15. Semi-Leptonic and Non-Leptonic B Meson Decays to Charmed Mesons

    Institute of Scientific and Technical Information of China (English)

    付慧峰; 王国利; 王志会; 陈相君

    2011-01-01

    We study the semi-leptonic and non-Ieptonic B weak decays that are governed by the B→D(*) transitions. The branching ratios, CP asymmetries (CPAs) and polarization fractions of non-leptonic decays are investigated in the factorization approximation (FA). The B →D(*) form factors are estimated in the Salpeter method. Our estimation on branching ratios is in general agreement with existing experimental data. For CPAs and polarizations, comparisons among the FA results, the perturbative QCD predictions and experimental data are presented.%We study the semi-leptonic and non-leptonic B weak decays that are governed by the B → D(*)transitions.The branching ratios,CP asymmetries(CPAs)and polarization fractions of non-leptonic decays are investigated in the factorization approximation(FA).The B →* D(*)form factors are estimated in the Salpeter method.Our estimation on branching ratios is in general agreement with existing experimental data.For CPAs and polarizations,comparisons among the FA results,the perturbative QCD predictions and experimental data are presented.

  16. Quantum field theory approaches to meson structure

    International Nuclear Information System (INIS)

    Meson spectroscopy became one of the most interesting topics in particle physics in the last ten years. In particular, the discovery of new unexpected states in the charmonium spectrum which cannot be simply explained by the constituent quark model attracted the interest of many theoretical efforts. In the present thesis we discuss different meson structures ranging from light and heavy quark-antiquark states to bound states of hadrons-hadronic molecules. Here we consider the light scalar mesons f0(980) and a0(980) and the charmonium-like Y(3940), Y(4140) and Z±(4430) states. In the discussion of the meson properties like mass spectrum, total and partial decay widths and production rates we introduce three different theoretical methods for the treatment and description of hadronic structure. For the study of bound states of mesons we apply a coupled channel approach which allows for the dynamical generation of meson-meson resonances. The decay properties of meson molecules are further on studied within a second model based on effective Lagrangians describing the interaction of the bound state and its constituents. Besides hadronic molecules the effective Lagrangian approach is also used to study the radiative and strong decay properties of ordinary quark-antiquark (q anti q) states. The AdS/QCD model forms the completion of the three theoretical methods introduced in the present thesis. This holographic model provides a completely different ansatz and is based on extra dimensions and string theory. Within this framework we calculate the mass spectrum of light and heavy mesons and their decay constants.

  17. Heavy mesons in a hadronic medium: interaction and transport coefficients

    CERN Document Server

    Torres-Rincon, Juan M; Cabrera, Daniel; Romanets, Olena; Tolos, Laura

    2015-01-01

    We review the recent results of heavy meson diffusion in thermal hadronic matter. The interactions of D and B-bar mesons with other hadrons (light mesons and baryons) are extracted from effective field theories based on chiral and heavy-quark symmetries. When these guiding principles are combined with exact unitarity, physical values of the cross sections are obtained. These cross sections (which contain resonant contributions) are used to calculate the drag and diffusion coefficients of heavy mesons immersed in a thermal and dense medium. The transport coefficients are computed using a Fokker-Planck reduction of the Boltzmann equation.

  18. Resurrection of the $\\sigma$ meson

    CERN Document Server

    Törnqvist, N A; Tornqvist, Nils A; Roos, Matts

    1995-01-01

    It is shown from a very general model and an analysis of data on the lightest 0++ meson nonet that the f0(980) and f0(1200) resonance poles are two manifestations of the same ss state. Similarily the a0(980) and the a0(1450) are likely to be two manifestations of the same qq state. On the other hand, the uu+dd state, when unitarized and strongly distorted by hadronic mass shifts, becomes an extremely broad Breit-Wigner-like background, m=860 MeV, Gamma=880 MeV, with its pole at s=(0.158-i0.235) GeV^2. This we identify with the sigma meson required by models for spontaneous breaking of chiral symmetry.

  19. Charming CP Violation and Dipole Operators from RS Flavor Anarchy

    CERN Document Server

    Delaunay, Cédric; Perez, Gilad; Randall, Lisa

    2013-01-01

    Recently the LHCb collaboration reported evidence for direct CP violation in charm decays. The value is sufficiently large that either substantially enhanced Standard Model contributions or non-Standard Model physics is required to explain it. In the latter case only a limited number of possibilities would be consistent with other existing flavor-changing constraints. We show that warped extra dimensional models that explain the quark spectrum through flavor anarchy can naturally give rise to contributions of the size required to explain the the LHCb result. The D meson asymmetry arises through a sizable CP-violating contribution to a chromomagnetic dipole operator. This happens naturally without introducing inconsistencies with existing constraints in the up quark sector. We discuss some subtleties in the loop calculation that are similar to those in Higgs to \\gamma\\gamma. Loop-induced dipole operators in warped scenarios and their composite analogs exhibit non-trivial dependence on the Higgs profile, with t...

  20. Exotic charmed baryon production in ultrarelativistic heavy ion collisions

    International Nuclear Information System (INIS)

    The authors investigate multi-heavy baryon formation in Au + Au collision using an extended version of the combinatoric break up model for rehadronization. A penalty factor, p, is introduced to characterize the coalescence probability of a light quark with a heavy one. At LHC energy large production rate is found for certain multi-heavy baryons and mesons such as Ωccc, Ξcc, J/Ψ and suppression for Λc, D. They speculate also on the possible existence of a heavy bottom-charm six-quark baryon. A semiclassical and a gaussian estimate reveal that the octet-octet bbb-cc configuration can be energetically favored with respect to the singlet-singlet one