Sample records for anomalons

  1. Search for anomalons and fragments with fractional charge among the products of fragmentation of /sup 16/O nuclei with momentum 4. 5 GeV/c per nucleon

    Energy Technology Data Exchange (ETDEWEB)

    Avdei-brevechikov, V.V.; Bogdanov, A.I.; Budilov, V.A.; Zhidkov, N.K.; Gorshkova, N.L.; Kotus, A.; Murin, Y.; Nikitin, V.A.; Nomokonov, P.V.; Trai-brevekova, M.D.; and others


    We have carried out a search for nuclei with an anomalous interaction (anomalons) with lifetimeapprox. >5 x 10/sup -8/ sec and fragments with fractional charge among the products of interaction of oxygen nuclei accelerated in the synchrophasotron at the Joint Institute for Nuclear Research to momentum 4.5 GeV/c per nucleon. The primary beam hits a thin target placed in the accelerator chamber. Fragments are detected by a telescope of semiconductor detectors at a distance of 18 m from the target. The mean free paths have been measured in silicon for primary nuclei /sup 7//sub 3/Li, /sup 10//sub 5/B, /sup 12//sub 6/C and fragments with charges 2--7 and momenta 4.5 GeV/c per nucleon. The admixture of anomalons and fragments with fractional charge among normal fragments has been estimated in the range of charges 2less than or equal toZless than or equal to7. The upper limit of the fraction of anomalons is 0.8%, and of fragments with fractional charge 2 x 10/sup -4/ at the 95% confidence level.

  2. Leptophobic Boson Signals with Leptons, Jets and Missing Energy

    Energy Technology Data Exchange (ETDEWEB)

    Dobrescu, Bogdan A.


    Color-singlet gauge bosons with renormalizable couplings to quarks but not to leptons must interact with additional fermions (''anomalons'') required to cancel the gauge anomalies. Analyzing the decays of such leptophobic bosons into anomalons, I show that they produce final states involving leptons at the LHC. Resonant production of a flavor-universal leptophobic Z' boson leads to cascade decays via anomalons, whose signatures include a leptonically decaying Z, missing energy and several jets. A Z' boson that couples to the right-handed quarks of the first and second generations undergoes cascade decays that violate lepton universality and include signals with two leptons and jets, or with a Higgs boson, a lepton, a W and missing energy.

  3. Gordon Conference on Nuclear Research

    Energy Technology Data Exchange (ETDEWEB)

    Austin, S.M.


    Session topics were: quarks and nuclear physics; anomalons and anti-protons; the independent particle structure of nuclei; relativistic descriptions of nuclear structure and scattering; nuclear structure at high excitation; advances in nuclear astrophysics; properties of nuclear material; the earliest moments of the universe; and pions and spin excitations in nuclei.


    Institute of Scientific and Technical Information of China (English)



    The interaction mean free path of He projectile fragments, produced by the collisions of 16O at 60 A GeV in a nuclear emulsion, has been investigated. In the present analysis, 1555 He projectile fragments, giving rise to 320 secondary interactions, have been used. At a level of 3% a very weak signal of anomalons is observed, which comes mainly from the 3×He channel.

  5. Levantamento da fauna de Ichneumonidae (Hymenoptera em cultivo de coqueiro anão verde associado à plantas invasoras

    Directory of Open Access Journals (Sweden)

    Emerson Comério


    Abstract. This study aimed to survey the Ichneumonidae (Hymenoptera fauna in coconut palm crop and analyze the influence of invasive plants on this fauna. From February 2008 to March 2009 weekly samples were performed using Möericke traps in areas with and without invasive plants. A total of 569 specimens were identified in 11 subfamilies. Cryptinae corresponded to more than 50% of the total ichneumonids collected in the two studied areas and, among the ophioniformes subfamilies, 9 genera were identified, being Dusona and Anomalon the most abundant. The area with invasive plants presented a higher number of subfamilies and abundance of specimens. However, significant differences in abundance were observed only to Cryptinae and Ichneumoninae.