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arXiv · hep-ex/0105011

Study of N* Production from J/Psi--> p pbar eta

J. Z. Bai·; H. C. Chiang·G. X. Peng·J. X. Wang·J. J. Zhu
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Abstract

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 $Γ= 95\pm 25$ MeV. In addition, there is a peak around 1650 MeV with JP=1/2- preferred also, fitted with $M =1647\pm 20$ MeV and $Γ= 145^{+80}_{-45}$ 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.

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J. Z. Bai, ; H. C. Chiang, G. X. Peng, J. X. Wang, J. J. Zhu. 2001-05-08. Study of N* Production from J/Psi--> p pbar eta. https://doi.org/10.1016/s0370-2693(01)00605-0

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