English

Recent N^* Results From J/\psi Decays

High Energy Physics - Experiment 2014-11-17 v1

Abstract

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 η\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.

Keywords

Cite

@article{arxiv.hep-ex/9910032,
  title  = {Recent N^* Results From J/\psi Decays},
  author = {Haibo LI},
  journal= {arXiv preprint arXiv:hep-ex/9910032},
  year   = {2014}
}

Comments

4 pages, 4 figures, proceedings for Hadron99

R2 v1 2026-07-22T13:10:33.893Z