Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2001-05-08
Phys.Lett.B510:75-82,2001
Physics
High Energy Physics
High Energy Physics - Experiment
Postscript file, 11 pages
Scientific paper
10.1016/S0370-2693(01)00605-0
Data are presented on the reaction J/psi--> p pbar eta using 7.8 million J/psi triggers collected by the BEjing Spectrometer (BES). A partial wave analysis is performed. A clear enhancement near the p eta(pbar eta) threshold is observed. It is fitted with a JP=1/2- resonance with mass $M= 1530\pm 10$ MeV and width $\Gamma = 95\pm 25$ MeV. In addition, there is a peak around 1650 MeV with JP=1/2- preferred also, fitted with $M =1647\pm 20$ MeV and $\Gamma = 145^{+80}_{-45}$ MeV. These two N* resonances are believed to be the two well established states, S11(1535) and S11(1650), respectively. It is the first partial wave study of the production of these resonances from J/psi decays.
Bai J. Z.
Chiang ; H. C.
Peng Guang-Xiong
Wang Jing-Xiu
Zhu Jia-Ji
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