Pentaquark Search at HERMES

Details Pentaquark Search at HERMES Pentaquark Search at HERMES

2004-11-05

arxiv.org/abs/hep-ex/0411027v1

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, 6 figures, International Workshop PENTAQUARK04, SPring-8, Japan, July 2004

Scientific paper

Evidence for a narrow baryon state at 1528 +- 2.6(stat) +- 2.1(syst) MeV is presented in quasi-real photoproduction on a deuterium target through the decay channel p,K0 to p,pi+,pi-. The statistical significance of the peak in the p,K0 invariant mass spectrum is 4 standard deviations and its extracted intrinsic width Gamma = 17 +- 9(stat) +- 3(syst) MeV. This state may be interpreted as the predicted S=+1 exotic Theta+ (uudd\bar{s}) pentaquark baryon.

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