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Mainz 2004 – scientific programme

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T: Teilchenphysik

T 506: Schwache Wechselwirkung II

T 506.10: Talk

Wednesday, March 31, 2004, 18:30–18:45, HS VII

Evidence for a Narrow State at M=1528 MeV at HERMES — •Wolf-Dieter Nowak — DESY, D-15738 Zeuthen, Platanenalle 6

Evidence for a narrow baryon state is found at HERMES in quasi-real photoproduction on a deuterium target in the invariant mass distribution of the p Ks0 system, with the Kaon decaying into two charged pions. A peak is observed at 1528 MeV with statistical and systematic uncertainty each being 2 MeV. The width of the peak is dominated by the experimental resolution of 7.2 MeV. Depending on the backgroud model, the naive statistical significance ranges from 4.7 to 9.0 σ. This state may be interpreted as the predicted S=+1 exotic Θ+ pentaquark baryon.

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