Gluonium spectrum in QCD

International Nuclear Information System (INIS)

Dominguez, C.A.

1987-02-01

The scalar (0 ++ ) and the tensor (2 ++ ) gluonium spectrum is analyzed in the framework of QCD sum rules. Stable eigenvalue solutions, consistent with duality and low energy theorems, are obtained for the mass and width of these glueballs. (orig.)

A global fit to determine the pseudoscalar mixing angle and the gluonium content of the η' meson

International Nuclear Information System (INIS)

Ambrosino, F.; Antonelli, A.; Antonelli, M.; Bencivenni, G.; Bertolucci, S.; Bloise, C.; Bossi, F.; Capon, G.; Capussela, T.; Ciambrone, P.; De Lucia, E.; De Simone, P.; Archilli, F.; Beltrame, P.; Bini, C.; De Santis, A.; De Zorzi, G.; Bocchetta, S.; Ceradini, F.; Branchini, P.

2009-01-01

We update the values of the η-η' mixing angle and of the η' gluonium content by fitting our measurement R φ = BR(φ → η'γ)/BR(φ → ηγ) together with several vector meson radiative decays to pseudoscalars (V → Pγ), pseudoscalar mesons radiative decays to vectors (P → Vγ) and the η' → γγ, π 0 → γγ widths. From the fit we extract a gluonium fraction of Z G 2 = 0.12±0.04, the pseudoscalar mixing angle ψ P = (40.4±0.6) 0 and the φ-ω mixing angle ψ V = (3.32±0.09) 0 . Z G 2 and ψ P are fairly consistent with those previously published. We also evaluate the impact on the η' gluonium content determination of future experimental improvements of the η' branching ratios and decay width.

In a search for scalar gluonium

International Nuclear Information System (INIS)

Novikov, V.A.; Shifman, M.A.; Vainshtein, A.I.; Zakharov, V.I.

1979-01-01

The problem of a scalar meson coupled strongly to gluons is discussed. Radiative decays of the J/psi are taken as a source of gluons. The aim of the paper is to calculate the GITA(J/psi→σγ) decay width where σ is the presumed scalar luonium. QCD sum rules was used to find both , (where Gsub(μν)sup(a) is the gluon field strength tensor and αsub(s) is the quark-gluon coupling constant) and GITA(J/psi→σγ) in terms of . The final prediction for the width is expected to be valid within a factor of two and gives GITA(J/psi→σγ→ two pions in S wave + γ) approximately equal to 25 eV for Msub(σ)=700 MeV. Nonperturbative QCD naturally explains the observed asymmetry between scalar and pseudoscalar states in the radiative decays of the J/psi. Some general remarks on gluonium in QCD are made

Quark-gluon mixing in pseudoscalar and tensor mesons

International Nuclear Information System (INIS)

Eremyan, Sh.S.; Nazaryan, A.E.

1986-01-01

A mixing model of quark-antiquark ang gluonium states in η, η', i(1440) pseudoscalar and f, f', Θ(1690) tensor mesons is considered. Description of and predictions for 68 two-particle decays with these particles taking part in them are obtained. It is shown that i(1440) by 85% consists of gluonium and Θ(1690) is a pure gluonic state. The quark-gluon and gluon-gluon couplings in the pseudoscalar sector are obtained to be stronger as compared to the corresponding ones in the tensor case

Status of gluonium searches

International Nuclear Information System (INIS)

Heusch, C.A.; California Univ., Santa Cruz, CA

1991-01-01

Quantum chromodynamics predicts the existence of quarkless mesons. The search for these hadrons has been ingenious and persevering. A review is presented of the current status of research that considers all model-dependent theoretical prejudice when searching for specific states. Early hints for candidate states have been investigated in the light of recent data, mostly from the Mark III Collaboration, in radiative charmonium decay. No 'smoking-gun' candidate stands out. (R.P.) 25 refs., 20 figs., 2 tabs

The tau-charm factory: Experimental perspectives

International Nuclear Information System (INIS)

Perl, M.L.; Schindler, R.H.

1991-09-01

This report discusses the Tau-Charm Factory Concept; D and D S Physics at the Tau-Charm Factory; τ and ν τ Physics at the Tau-Charm Factory; and Charmonium, Gluonium and Light Quark Spectroscopy at the Tau-Charm Factory

J/psi and Υ radiative and hadronic decays

International Nuclear Information System (INIS)

Bloom, E.D.

1987-07-01

The search for gluonium at the J/psi and Υ is discussed, as well as the search for exotics at the Υ. Reactions discussed include radiative and hadronic decays of the J/psi and the search for radiative decays of the Υ. Future perspectives are also briefly considered. 45 refs., 27 figs

The glueball trail

International Nuclear Information System (INIS)

Roy, P.

1980-03-01

The issue of the existence and of the mass values of a new type of unstable hadron composed only of glue, called glueballs (or gluonium), is discussed. Suggested models which could indicate their existence are considered and possible production mechanisms in hadron-hadron collisions and in the decay of heavy quarkonia examined. (UK)

SVZ⊕1/q{sup 2}-expansion versus some QCD holographic models

Energy Technology Data Exchange (ETDEWEB)

Jugeau, F., E-mail: frederic.jugeau@if.ufrj.br [Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, RJ 21941-972, Rio de Janeiro (Brazil); Narison, S., E-mail: snarison@yahoo.fr [Laboratoire Particules et Univers de Montpellier, CNRS-IN2P3, Case 070, Place Eugène Bataillon, 34095 Montpellier (France); Ratsimbarison, H., E-mail: herysedra@yahoo.fr [Institute of High-Energy Physics of Madagascar (iHEP-MAD), University of Antananarivo (Madagascar)

2013-05-13

Considering the classical two-point correlators built from (axial-) vector, scalar q{sup ¯}q and gluonium currents, we confront results obtained using the SVZ⊕1/q{sup 2}-expansion to the ones from some QCD holographic models in the Euclidean region and with negative dilaton Φ{sub i}(z)=−|c{sub i}{sup 2}|z{sup 2}. We conclude that the presence of the 1/q{sup 2}-term in the SVZ-expansion due to a tachyonic gluon mass appears naturally in the Minimum Soft-Wall (MSW) and the Gauge/String Dual (GSD) models which can also reproduce semi-quantitatively some of the higher dimension condensate contributions appearing in the OPE. The Hard-Wall model shows a large departure from the SVZ⊕1/q{sup 2}-expansion in the vector, scalar and gluonium channels due to the absence of any power corrections. The equivalence of the MSW and GSD models is manifest in the vector channel through the relation of the dilaton parameter with the tachyonic gluon mass. For approximately reproducing the phenomenological values of the dimension d=4,6 condensates, the holographic models require a tachyonic gluon mass (α{sub s}/π)λ{sup 2}≈−(0.12–0.14) GeV{sup 2}, which is about twice the fitted phenomenological value from e{sup +}e{sup −} data. The relation of the inverse length parameter c{sub i} to the tachyonic gluon mass also shows that c{sub i} is channel dependent but not universal for a given holographic model. Using the MSW model and M{sub ρ}=0.78 GeV as input, we predict a scalar q{sup ¯}q mass M{sub S}≈(0.95–1.10) GeV and a scalar gluonium mass M{sub G}≈(1.1–1.3) GeV.

Production and decay rates of the iota meson

International Nuclear Information System (INIS)

Frank, M.; O'Donnell, P.J.; Toronto Univ., Ontario

1984-01-01

We correlate the results for the mass spectrum of low lying isoscalar-pseudoscalar mesons with the production decay rates from J/psi->γP, with P=eta 1 , eta' 1 , eta 2 and iota and study the radiative decays of the iota meson. We conclude that the iota meson has to be interpreted as having a strong gluonium component. (orig.)

Gluonium candidates from hadronic and e+e- interactions

International Nuclear Information System (INIS)

Heusch, C.A.

1985-12-01

The experimental approaches exploited in the search for gluonia that are deemed most promising are briefly described, both in hadron-hadron collisions and heavy quarkonium decay. The presently available evidence is summarized for those states that have been claimed as possible gluonia. Proceeding in the order of lowest-mass expectation, categorization is done only in terms of definitive (or putative) J/sup PC/ assignments. 51 refs., 16 figs., 3 tabs

Glueball candidate iota(1460) and quarkonium-gluonium mixing

International Nuclear Information System (INIS)

Basu, S.; Lahiri, A.; Bagchi, B.

1988-01-01

Using infinite-momentum-frame techniques we generalize the Schwinger formula for the pseudoscalar nonets to include the effects of the iota(1460). By seeking consistency with its current rates we estimate the eta-eta'-iota(1460) mixing angles. We also allow the possibility of nonet symmetry breaking in the iota couplings. Our results support a glueball interpretation of the iota with eta,eta' not inconsistent with quarkonium states

The interpretation of the iota meson

International Nuclear Information System (INIS)

Frank, M.

1985-01-01

The authors analyze the iota (1440) meson in a non-relativistic quark model. The authors review the experimental data, then attempt to incorporate it in the mass spectrum and radiative decays of the low-lying pseudoscalar and vector mesons. Correlating these results with production decay rates from J/psi and the radiative decays of iota, the authors conclude that the iota has to be interpreted as having a strong gluonium component

Recent status and results from BES

International Nuclear Information System (INIS)

Wang, P.

1994-01-01

Recent results on the τ leptonic mass by the analysis of several one prong decay channels, the search of gluonium state near J/ψ which was proposed to explain the so-called ρπ puzzle, and some preliminary results of D s meson from BES (Beijing Electron Spectrometer) are reported. Future plans of upgrading BEPC (Beijing Electron-Positron Collider) and BES are also described. (author). 3 refs., 1 fig., 1 tab

Glueballs--some selected theoretical topics

International Nuclear Information System (INIS)

Carlson, C.E.

1983-01-01

Elementary considerations of how glueballs may be found--by oddballs (abnormal -c /SUB n/ states), by overpopulation, and by decay democracy--are given. Two glueball candidates iota 1440 and theta 1640 are considered. It is stated that iota 1440 can be accommodated as a radically excited pseudoscalar, not as a glueball. Theta 1640 has decay properties uncharacteristic of glueballs, but of a state made from quarks. Finally, the worry that glueballs may mix with quark states with the same quantum number (gluonium-quarkonium mixing) is examined

LEAR

International Nuclear Information System (INIS)

Lefevre, P.

1984-01-01

In general LEAR provides a precise experimental tool which: opens the domain of low energy quark dynamics (chemistry of quarks by carrying experiments connected to baryonium, gluonium, etc..), using nuclear targets it allows to tackle the nuclear physics aspects in a completely new fashion, permits many exciting applications to future options due to the further improvements on statistical precision and energy resolution (Δp/p): internal targets, H - anti p co-rotating beams (protonium formation in flight), panti p collider and ultra low energy domain (down to 20 MeV/c.). (orig./HSI)

One interpretation for recent BES observation

International Nuclear Information System (INIS)

Hao Gang; Qiao Congfeng; Zhang Ailin

2007-01-01

Motivated by the recent BES observation of the p(p-bar) enhancement near threshold in radiative J/ψ decays, X(1860) and X(1835), we choose the 0 -+ trigluonium state as a possible candidate and calculate its mass with QCD sum rules, which is found to be approximately in the region between 1.9GeV and 2.7GeV with some theoretical uncertainties. With the fact that the new BES resonance exhibits the behavior of this trigluon state, our analyses favor the baryonium-gluonium mixing picture for the BES observation. (authors)

Search for a vector glueball by a scan of the J/ψ resonance

International Nuclear Information System (INIS)

Bai, J.Z.; Bardon, O.; Blum, I.; Breakstone, A.; Burnett, T.; Chen, G.P.; Chen, H.F.; Chen, J.; Chen, S.M.; Chen, Y.; Chen, Y.B.; Chen, Y.Q.; Cheng, B.S.; Cowan, R.F.; Cui, X.Z.; Ding, H.L.; Du, Z.Z.; Dunwoodie, W.; Fan, X.L.; Fang, J.; Fero, M.; Gao, C.S.; Gao, M.L.; Gao, S.Q.; Gratton, P.; Gu, J.H.; Gu, S.D.; Gu, W.X.; Gu, Y.F.; Guo, Y.N.; Han, S.W.; Han, Y.; Harris, F.A.; Hatanaka, M.; He, J.; He, M.; Hitlin, D.G.; Hu, G.Y.; Hu, T.; Hu, X.Q.; Huang, D.Q.; Huang, Y.Z.; Izen, J.M.; Jia, Q.P.; Jiang, C.H.; Jin, S.; Jin, Y.; Jones, L.; Kang, S.H.; Ke, Z.J.; Kelsey, M.H.; Kim, B.K.; Kong, D.; Lai, Y.F.; Lan, H.B.; Lang, P.F.; Lankford, A.; Li, F.; Li, J.; Li, P.Q.; Li, Q.; Li, R.B.; Li, W.; Li, W.D.; Li, W.G.; Li, X.H.; Li, X.N.; Lin, S.Z.; Liu, H.M.; Liu, J.; Liu, J.H.; Liu, Q.; Liu, R.G.; Liu, Y.; Liu, Z.A.; Lou, X.C.; Lowery, B.; Lu, J.G.; Luo, S.Q.; Luo, Y.; Ma, A.M.; Ma, E.C.; Ma, J.M.; Mao, H.S.; Mao, Z.P.; Malchow, R.; Mandelkern, M.; Meng, X.C.; Ni, H.L.; Nie, J.; Olsen, S.L.; Oyang, J.; Paluselli, D.; Pan, L.J.; Panetta, J.; Porter, F.; Prabhakar, E.; Qi, N.D.; Que, Y.K.; Quigley, J.; Rong, G.; Schernau, M.; Schmid, B.; Schultz, J.; Shao, Y.Y.; Shen, B.W.; Shen, D.L.; Shen, H.; Shen, X.Y.; Sheng, H.Y.; Shi, H.Z.; Shi, X.R.; Smith, A.; Soderstrom, E.; Song, X.F.; Standifird, J.; Stoker, D.; Sun, F.; Sun, H.S.; Sun, S.J.; Synodinos, J.; Tan, Y.P.; Tang, S.Q.; Toki, W.; Tong, G.L.; Torrence, E.; Wang, F.; Wang, L.S.; Wang, L.Z.; Wang, M.; Wang, P.; Wang, P.L.; Wang, S.M.; Wang, T.J.; Wang, Y.Y.; Wei, C.L.; Whittaker, S.; Wilson, R.; Wisniewski, W.J.; Xi, D.M.; Xia, X.M.; Xie, P.P.; Xiong, W.J.; Xu, D.Z.; Xu, R.S.; Xu, Z.Q.; Xue, S.T.; Yamamoto, R.; Yan, J.; Yan, W.G.; Yang, C.M.; Yang, C.Y.; Yang, J.; Yang, W.; Ye, M.H.; Ye, S.W.; Ye, S.Z.; Young, K.; Yu, C.S.; Yu, C.X.; Yu, Z.Q.; Yuan, C.Z.; Zhang, B.Y.; Zhang, C.C.; Zhang, D.H.; Zhang, H.L.; Zhang, J.; Zhang, J.W.; Zhang, L.S.; Zhang, S.Q.; Zhang, Y.; Zhang, Y.Y.; Zhao, D.X.; Zhao, H.W.; Zhao, J.W.

1996-01-01

The cross section for e + e - →ρπ has been measured by the BES detector at BEPC at center-of-mass energies covering a 40 MeV interval spanning the J/ψ resonance. The data are used to search for the vector gluonium state hypothesized by Brodsky, Lepage, and Tuan as an explanation of the ρπ puzzle in charmonium physics. The shape of the ρπ cross section is compatible with that of the total hadronic cross section. No distortions indicating the presence of a vector glueball are seen. copyright 1996 The American Physical Society

Absence of even-integer ζ-function values in Euclidean physical quantities in QCD

Science.gov (United States)

Jamin, Matthias; Miravitllas, Ramon

2018-04-01

At order αs4 in perturbative quantum chromodynamics, even-integer ζ-function values are present in Euclidean physical correlation functions like the scalar quark correlation function or the scalar gluonium correlator. We demonstrate that these contributions cancel when the perturbative expansion is expressed in terms of the so-called C-scheme coupling αˆs which has recently been introduced in Ref. [1]. It is furthermore conjectured that a ζ4 term should arise in the Adler function at order αs5 in the MS ‾-scheme, and that this term is expected to disappear in the C-scheme as well.

Selected results on J/PSI hadronic decays from DM2 and Mark III

International Nuclear Information System (INIS)

Augustin, J.E.

1985-01-01

Results from the high statistics experiments Mark III and DM2 on J/PSI hadronic decays are reviewed. Special interest is given to SU3 violating decays into two pseudoscalars and baryon-antibaryon, especially the first observation of J/PSI → Ksub(S)sup(o)Ksub(L)sup(o). The complete measurement of the vector + pseudoscalar modes allows a new determination of the eta and eta' mixing parameters, indicating the presence of a new component in the eta' wave function. The iota(1440) and theta(1700) gluonium candidates have been searched for in hadronic decays, and the Mark III experiment observes a signal in J/PSI → ω iota (or ωE)