Recent N^* Results From J/ψDecays

Details Recent N^* Results From J/ψDecays Recent N^* Results From J/ψDecays

1999-10-15

arxiv.org/abs/hep-ex/9910032v1

Nucl.Phys. A675 (2000) 189c-192c

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 4 figures, proceedings for Hadron99

Scientific paper

10.1016/S0375-9474(00)00243-8

Based on 7.8 million J/\psi events collected at BEPC, the events for J/\psi \to p\bar{p}\pi^0 and p\bar{p}\eta have been selected and reconstructed. Clear peaks are observed around 1480 MeV in p\pi^0 (\bar{p}\pi^0) invariant mass spectrum and near the threshold for $\eta$ production in p\eta(\bar{p}\eta) invariant mass spectrum. A partial wave analysis of J/\psi \to p\bar{p}\eta data has been performed. Two J^P={1/2}^- resonances are observed with mass and width (M, \Gamma) at (1540^{+15}_{-17}, 178^{+20}_{-22}) MeV and (1648^{+18}_{-16}, 150)MeV, and are considered to be the nucleon resonances S_{11}(1535) and S_{11}(1650) respectively.

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