ar X iv : h ep - e x / 04 06 04 6 v 1 1 7 Ju n 20 04 RECENT SPECTROSCOPY RESULTS FROM ZEUS
نویسنده
چکیده
Recent results on light hadron spectroscopy are reported, with special emphasis on the evidence for a narrow baryonic state decaying to K 0 S p and K 0 S ¯ p, compatible with the pentaquark state θ + observed by fixed target experiments. The data were collected with the ZEUS detector at HERA using an integrated luminosity of 121 pb −1. The analyses were performed in the central rapidity region of inclusive deep inelastic scattering at an ep centre-of-mass energy of 300–318 GeV. Evidence for a narrow resonance in the K 0 S p and K 0 S ¯ p invariant mass spectrum is obtained, with mass 1521.5±1.5(stat) +2.8 −1.7 (syst) and width consistent with the experimental resolution. If the K 0 S p part of the signal is identified with the strange pentaquark θ + , the K 0 S ¯ p part is the first evidence for its antiparticle, ¯ θ −. Supporting results on other light hadron resonances are also discussed.
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تاریخ انتشار 2004