Recent N∗ results from JΨ decays

✍ Scribed by Haibo Li; H.C Chiang; G.X Peng; B.S Zou

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 235 KB
• Volume: 675
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(00)00243-8

✦ Synopsis

Based on 7.8 million d/¢ events collected by BES at BEPC, the events for J/~b ---4 p~zr ° and ppy have been selected and reconstructed. Clear peaks are observed around 1480 MeV in pTr°(]STr °) invariant mass spectrum and near the threshold for y production in pq(/Sr/) invariant mass spectrum. A partial wave analysis of J/¢ --+ p~y data has been performed. Two jR 1--22) ----~ resonances are observed with mass and width (M, F) at (1540_+~, 178 +2°~ MeV and +is (1648_16, 150)MeV, and are considered to be the nucleon resonances Sn(1535) and Sn(1650) respectively.