Physics – High Energy Physics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005iche.conf.1009r&link_type=abstract
HIGH ENERGY PHYSICS, ICHEP 2004. Proceedings of the 32nd International Conference. Held 16-22 August 2004 in Beijing, China. Edi
Physics
High Energy Physics
Scientific paper
Recent results on hadron spectroscopy are reported, with special emphasis on the evidence for a narrow baryonic state decaying to KS0p and KS0bar {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 center-of-mass energy of 300-318 GeV. Evidence for a narrow resonance in the KS0p and KS0bar {p} invariant mass spectrum is obtained, with mass 1521.5 ± 1.5(stat)-1.7+2.8(syst) MeV and width consistent with the experimental resolution. If the KS0p part of the signal is identified with the strange pentaquark Θ+, the KS0bar {p} part is the first evidence for its antiparticle, bar {Θ }-. Also reported are cross-section measurements for Θ+ production and decay. The cross sections are compared in bins of Qmin2 to those of Λ-baryons produced in the same kinematic region. Supporting results on other hadron resonances are also discussed.
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