Measurement of the branching fractions for J/{psi}{yields}{gamma}{pi}{sup 0}, {gamma}{eta} and {gamma}{eta}{sup '}

M. Ablikim,J. Z. Bai, Y. Ban,J. G. Bian, XZ（蔡翔舟） Cai,H. F. Chen,H. S. Chen,Huirun Chen,J. C. Chen,Jin Chen,Y. B. Chen,S. P. Chi,Y. P. Chu,Xingzhu Cui,Y. S. Dai,L. Y. Diao,Z. Y. Deng,Q. F. Dong,S. X. Du, J. Fang,S. S. Fang, C. D. Fu,C. S. Gao,Y. N. Gao,S. D. Gu,Y. T. Gu,Y. N. Guo,Y. Q. Guo,Z. J. Guo,F. A. Harris,K. L. He,Miao He,Y. K. Heng,H. M. Hu, T. Hu,G. S. Huang,X. T. Huang,X. B. Ji, X. S. Jiang, X. Y. Jiang,J. B. Jiao, D. P. Jin, S. Jin,Yi Jin,Y. F. Lai,G. Li,H. B. Li,Hangxu Li,J. C. Li, R. Y. Li,S. M. Li,W. D. Li,W. G. Li,X. L. Li,X. N. Li,X. Q. Li, Y. Li, Y. F. Liang,Hongbo Liao, B. J. Liu,C. X. Liu, F. Liu, Fang Liu,H. H. Liu,H. M. Liu, J. P. Liu,J. B. Liu,J. P. Liu, Q. Liu,R. G. Liu,Z. A. Liu,Y. C. Lou, F. Lu,G. R. Lu,J. G. Lu, C. L. Luo,F. C. Ma,H. L. Ma,L. L. Ma,Q. M. Ma,X. B. Ma,Z. P. Mao,X. H. Mo, J. Nie,S. L. Olsen,Haiping Peng,R. G. Ping,N. D. Qi,H. Qin,J. F. Qiu,Z. Y. Ren,G. Rong,Lianyou Shan,Shang Lunlin,C. P. Shen,D. L. Shen,X. Y. Shen,H. Y. Sheng,H. S. Sun,Jianwei Sun

Physical Review D（2006）

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摘要

The decay modes J/{psi}{yields}{gamma}{pi}{sup 0}, {gamma}{eta} and {gamma}{eta}{sup '} are analyzed using a data sample of 58x10{sup 6} J/{psi} decays collected with the BESII detector at the BEPC. The branching fractions are determined to be: Br(J/{psi}{yields}{gamma}{pi}{sup 0})=(3.13{sub -0.47}{sup +0.65})x10{sup -5}, Br(J/{psi}{yields}{gamma}{eta})=(11.23{+-}0.89)x10{sup -4}, and Br(J/{psi}{yields}{gamma}{eta}{sup '})=(5.55{+-}0.44)x10{sup -3}, where the errors are combined statistical and systematic errors. The ratio of partial widths {gamma}(J/{psi}{yields}{gamma}{eta}{sup '})/{gamma}(J/{psi}{yields}{gamma}{eta}) is measured to be 4.94{+-}0.40, and the singlet-octet pseudoscalar mixing angle of {eta}-{eta}{sup '} system is determined.

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