Determination Ofj/ψleptonic Branching Fraction Viaψ(2s)→π+…
J. Z. Bai,J. G. Bian,I. Blum,Z. Chai,G. P. Chen, H. F. Chen,Jia Wofsy Chen,J. C. Chen,Y. Chen,Y. B. Chen,Y. Q. Chen,B. S. Cheng,X. Z. Cui,H. L. Ding,L. Ding, Dong Liu, Z. Z. Du,W. Dunwoodie,S. H. Feng,C. S. Gao,M. Gao,S. Q. Gao,P. Gratton,J. H. Gu,S. Gu,W. X. Gu,Y. F. Gu,Y. N. Guo,S. W. Han,Yinlu Han,F. A. Harris,J. He,M. He,D. G. Hitlin,G. Y. Hu, H. M. Hu, Jie Hu,Qin Hu,T. Hu,X. Q. Hu,J. D. Huang,Yizhong Huang,J. M. Izen,Chun-Hua Jiang,Y. Jin,Z. J. Ke,M. H. Kelsey,B. K. Kim,D. J. Kong,Y. F. Lai,P. F. Lang,A. J. Lankford,C. G. Li, D. Li,H. B. Li,Jia Li,P. Q. Li,Rongrong Li,W. Li,W. D. Li,W. G. Li,X. H. Li,X. N. Li,H. M. Liu,J. Liu,J. H. Liu,R. G. Liu, Yufeng Liu,Xuanhong Lou,B. Lowery,F. X. Lu,J. G. Lu,Jie Lu,L. C. Lu,C. H. Luo, A. M., E. C., J. M.,R. Malchow,H. S. Mao,Z. P. Mao,X. C. Meng, J. Nie,S. L. Olsen,J. Oyang,D. Paluselli,Pan Lu,J. Panetta,F. C. Porter,N. D. Qi,X. R. Qi,C. D. Qian,J. F. Qiu,Y. H. Qu,Y. K. Que,G. Rong,Michael Schernau,Y. Shao,B. W. Shen, D. L. Shen, Hong Shen, X. Y. Shen, H. Y. Sheng, H. Z. Shi, Xinmin Song, J. Standifird, F. Sun, Hao Sun, S. Q. Tang, W. H. Toki, G. L. Tong, F. Wang, L. S. Wang, L. Z. Wang, M. Wang, Meng Wang, P. Wang, P. L. Wang, S. M. Wang, T. J. Wang, Y. Y. Wang, M. Weaver, C. Wei, Yaoguo Wu, D. M. Xi, X. M. Xia, P. P. Xie, Y. Xie, W Xiong, C. Xu, G. F. Xu, S. Xue, Jun Yan, W. G. Yan, C. Yang, C. Y. Yang, J. Yang, W.-C. Yang, Xiaofei Yang, M. H. Ye, S. W. Ye, Y. X. Ye, K. Yi,Yu Chen, C. X. Yu, Y. H. Yu, Yú Zhang, Z. Yu, C. Z. Yuan, Y. Yuan, B. Y. Zhang, C. C. Zhang, D. H. Zhang, Dehong Zhang, H. L. Zhang, J. Zhang, J. L. Zhang, J. W. Zhang, L. S. Zhang, Qi-Long Zhang, S. Q. Zhang, X. Y. Zhang, Y. Zhang, Y. Y. Zhang, Dongxu Zhao, H. W. Zhao, Jiawei Zhao, M. G. Zhao, W. R. Zhao, Z. G. Zhao, J. P. Zheng, Lei Zheng, Z. P. Zheng, G. P. Zhou, H. Zhou, Zhou Li, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, B. A. Zhuang Physical review D Particles, fields, gravitation, and cosmology/Physical review D Particles and fields（1998）
摘要
A comparison of the rates for ψ(2S)→π+π−J/ψ, J/ψ→l+l− and J/ψ→ anything is used to determine the J/ψ leptonic branching fractions. The results are B(J/ψ→e+e−)=(5.90±0.05±0.10)% and B(J/ψ→μ+μ−)=(5.84±0.06±0.10)%, where the first error is statistical and the second is systematic. Assuming lepton universality, the leptonic branching fraction of the J/ψ is B(J/ψ→l+l−)=(5.87±0.04±0.09)% per species. This result is used to estimate the QCD scale factor ΛMS¯(4) and the strong coupling constant αs. Received 11 June 1998DOI:https://doi.org/10.1103/PhysRevD.58.092006©1998 American Physical Society
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