Measurement of the branching fractions for J/ψ→γπ0, γη and γη′

M. Ablikim,J. Bai, Y. Ban,J. Bian, X. Cai,H. Chen,J. Chen,Jin Chen, Y. Chen,S. Chi,Y. Chu,X. Cui,Y. Dai,L. Diao,Z. Deng,Q. Dong,S. Du, J. Fang,S. Fang, C. Fu,C. Gao, Y. Gao,S. Gu, Y. Gu, Y. Guo, Z. Guo,F. Harris, K. He, M. He, Y. Heng,H. Hu, T. Hu, G. Huang,X. Huang,X. Ji,X. Jiang,J. Jiao,D. Jin, S. Jin,Yi Jin,Y. Lai, G. Li, H. Li, J. Li,R. Li,S. Li, W. Li, X. Li, Y. Li, Y. Liang,H. Liao,B. Liu, C. Liu,F. Liu, Fang Liu,H. Liu,J. Liu, Q. Liu,R. Liu,Z. Liu,Y. Lou,F. Lu,G. Lu,J. Lu,C. Luo,F. Ma,H. Ma,L. Ma,Q. Ma,X. Ma,Z. Mao, X. Mo, J. Nie,S. Olsen,H. Peng,R. Ping,N. Qi, H. Qin, J. Qiu,Z. Ren,G. Rong,L. Shan,L. Shang,C. Shen,D. Shen,X. Shen,H. Sheng,H. Sun,J. Sun,S. Sun,Y. Sun,Z. Sun,Z. Tan,X. Tang,G. Tong, G. Varner, D. Wang, L. Wang,M. Wang,P. Wang, W. Wang,Y. Wang, Z. Wang,Zhe Wang, Zheng Wang,C. Wei,D. Wei,N. Wu,X. Xia,X. Xie,G. Xu,X. Xu, Y. Xu, M. Yan,H. Yang, Y. Yang,M. Ye,Y. Ye,Z. Yi, G. Yu,C. Yuan, J. Yuan,Y. Yuan,S. Zang,Y. Zeng,Yu Zeng,B. Zhang, C. Zhang, D. Zhang,H. Zhang,J. Zhang,S. Zhang,X. Zhang,Yiyun Zhang, Z. Zhang, D. Zhao,J. Zhao,M. Zhao,P. Zhao, W. Zhao,Z. Zhao, H. Zheng, J. Zheng,Z. Zheng, L. Zhou,N. Zhou, K. Zhu, Q. Zhu,Y. Zhu,Yingchun Zhu, Z. Zhu,B. Zhuang, X. Zhuang,B. Zou

PHYSICAL REVIEW D（2006）

引用 40|浏览103

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摘要

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

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