Measurement of the Branching Fractions for J/Psi -> P(P)Over-Bar Eta and P(P)Over-Bar Eta '

M. Ablikim,J. Z. Bai,Y. Bai,Y. Ban,X. Cai, H. F. Chen, H. S. Chen, H. X. Chen,J. C. Chen,Jin Chen,X. D. Chen,Y. B. Chen,Y. P. Chu,Y. S. Dai,Z. Y. Deng,S. X. Du,J. Fang,C. D. Fu,C. S. Gao,Y. N. Gao,S. D. Gu,Y. T. Gu,Y. N. Guo, Z. J. Guo,F. A. Harris,K. L. He,M. He,Y. K. Heng,H. M. Hu,T. Hu,G. S. Huang,X. T. Huang,Y. P. Huang,X. B. Ji,X. S. Jiang,J. B. Jiao,D. P. Jin,S. Jin,G. Li, H. B. Li,J. Li,L. Li,R. Y. Li,W. D. Li,W. G. Li,X. L. Li,X. N. Li,X. Q. Li,Y. F. Liang,B. J. Liu,C. X. Liu,Fang Liu,Feng Liu,H. M. Liu,J. P. Liu,H. B. Liu,J. Liu,Q. Liu,R. G. Liu,S. Liu,Z. A. Liu,F. Lu,G. R. Lu,J. G. Lu,C. L. Luo,F. C. Ma,H. L. Ma,Q. M. Ma,M. Q. A. Malik,Z. P. Mao,X. H. Mo,J. Nie,S. L. Olsen,R. G. Ping,N. D. Qi,J. F. Qiu,G. Rong,X. D. Ruan,L. Y. Shan,L. Shang,C. P. Shen,X. Y. Shen,H. Y. Sheng,H. S. Sun,S. S. Sun,Y. Z. Sun,Z. J. Sun,X. Tang,J. P. Tian,G. L. Tong,G. S. Varner,X. Wan,L. Wang,L. L. Wang,L. S. Wang,P. Wang,P. L. Wang,Y. F. Wang,Z. Wang,Z. Y. Wang,C. L. Wei,D. H. Wei,N. Wu,X. M. Xia,G. F. Xu,X. P. Xu,Y. Xu,M. L. Yan,H. X. Yang,M. Yang,Y. X. Yang,M. H. Ye,Y. X. Ye,C. X. Yu,C. Z. Yuan,Y. Yuan,Y. Zeng, B. X. Zhang,B. Y. Zhang,C. C. Zhang,D. H. Zhang,H. Q. Zhang,H. Y. Zhang,J. W. Zhang,J. Y. Zhang,X. Y. Zhang,Y. Y. Zhang,Z. X. Zhang,Z. P. Zhang,D. X. Zhao,J. W. Zhao,M. G. Zhao,P. P. Zhao,Z. G. Zhao,B. Zheng,H. Q. Zheng,J. P. Zheng,Z. P. Zheng,B. Zhong,L. Zhou,K. J. Zhu,Q. M. Zhu,X. W. Zhu,Y. S. Zhu,Z. A. Zhu,Z. L. Zhu,B. A. Zhuang,B. S. Zou

Physics letters B（2009）

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摘要

Using 58 x 10(6) J/psi events collected with the Beijing Spectrometer (BESII) at the Beijing Electron Positron Collider (BEPC), the branching fractions of J/psi to p (p) over bar eta and p (p) over bar eta' are determined. The ratio Gamma(J/psi -> p (p) over bar eta/Gamma(J/psi -> p (p) over bar obtained by this analysis agrees with expectations based on soft-pion theorem calculations. (C) 2009 Published by Elsevier B.V.

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