Meson Spectroscopy in Radiative J/ψ Decays and Hadron Production
Quantum Chromodynamics (QCD) predicts that gg bound states (glueballs) and q q g bound states (hybrids) should exist along with ordinary mesons and baryons in 1-2.5 GeV mass region. Experimentally, however, the spectroscopy of glueball, hybrids and mesons are very close related. The main signature is the observation of extra states which do not fit into q q nonets. Glueballs are, in addition, SU(3) flavor singlets and should be produced in gluon enriched channels such as radiative J/ψ decays, double pomeron exchange or OZI-violating decays. They should not occur in γγ interactions nor in peripheral hadron production. Therefore, the identification of glueballs and hybrids depends crucially on a complete understanding of all nearby q q nonets. Several candidates have been observed, among which the τ/η(1440), and the θ/f 2(1720) are at present the most promising. This brief report will present new results on the following topics: production of scalar states in radiative J/ψ decays by Mark III, partial wave analyses of the K K π system produced in K - p and π - p collisions by LASS and the BNL-E771 group, observation of pseudoscalars in two-vector-meson final states (VV) seen in radiative J/ψ decays by Mark III and a study of the ωω mass spectrum produced in π - p collisions by GAMS.
KeywordsDalitz Plot Invariant Mass Spectrum Partial Wave Analysis Heavy Flavor Scalar Glueball
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