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Observation of J/ψ decays to e^+e^-e^+e^- and e^+e^-μ^+μ^-

BESIII Collaboration,M. Ablikim,M. N. Achasov,P. Adlarson,M. Albrecht,R. Aliberti,A. Amoroso,M. R. An,Q. An,X. H. Bai,Y. Bai,O. Bakina,R. Baldini Ferroli,I. Balossino,Y. Ban,V. Batozskaya,D. Becker, K. Begzsuren,N. Berger,M. Bertani,D. Bettoni,F. Bianchi,J. Bloms,A. Bortone,I. Boyko,R. A. Briere,A. Brueggemann,H. Cai,X. Cai,A. Calcaterra,G. F. Cao,N. Cao,S. A. Cetin,J. F. Chang,W. L. Chang,G. Chelkov,C. Chen,G. Chen, H. S. Chen,M. L. Chen, S. J. Chen,T. Chen,X. R. Chen,X. T. Chen,Y. B. Chen,Z. J. Chen,W. S. Cheng,G. Cibinetto,F. Cossio,J. J. Cui,H. L. Dai,J. P. Dai,A. Dbeyssi,R. E. de Boer,D. Dedovich,Z. Y. Deng,A. Denig,I. Denysenko,M. Destefanis,F. De Mori,Y. Ding,J. Dong, L. Y. Dong,M. Y. Dong,X. Dong,S. X. Du,P. Egorov,Y. L. Fan,J. Fang,S. S. Fang,Y. Fang,R. Farinelli,L. Fava,F. Feldbauer,G. Felici, C. Q. Feng,J. H. Feng,K Fischer,M. Fritsch,C. F. Fritzsch,C. D. Fu,H. Gao,Y. N. Gao,Yang Gao,S. Garbolino,I. Garzia,P. T. Ge,C. Geng,E. M. Gersabeck,A Gilman,K. Goetzen,L. Gong,W. X. Gong,W. Gradl,M. Greco,M. H. Gu,C. Y Guan,A. Q. Guo,L. B. Guo, R. P. Guo,Y. P. Guo,A. Guskov,T. T. Han,W. Y. Han,X. Q. Hao,F. A. Harris,K. K. He,K. L. He,F. H. Heinsius,C. H. Heinz,Y. K. Heng,C. Herold,M. Himmelreich,T. Holtmann, G. Y. Hou,Y. R. Hou,Z. L. Hou,H. M. Hu,J. F. Hu,T. Hu,Y. Hu,G. S. Huang, K. X. Huang,L. Q. Huang,X. T. Huang,Y. P. Huang,Z. Huang,T. Hussain,N Hüsken,W. Imoehl,M. Irshad,J. Jackson,S. Jaeger,S. Janchiv,Q. Ji,Q. P. Ji,X. B. Ji,X. L. Ji,Y. Y. Ji,Z. K. Jia,H. B. Jiang, S. S. Jiang,X. S. Jiang,Y. Jiang,J. B. Jiao,Z. Jiao,S. Jin,Y. Jin,M. Q. Jing,T. Johansson,N. Kalantar-Nayestanaki,X. S. Kang,R. Kappert,M. Kavatsyuk,B. C. Ke,I. K. Keshk,A. Khoukaz, P. Kiese,R. Kiuchi, R. Kliemt,L. Koch,O. B. Kolcu,B. Kopf,M. Kuemmel,M. Kuessner,A. Kupsc,W. Kühn,J. J. Lane,J. S. Lange,P. Larin,A. Lavania,L. Lavezzi,Z. H. Lei,H. Leithoff,M. Lellmann,T. Lenz,C. Li,C. Li, C. H. Li,Cheng Li,D. M. Li,F. Li,G. Li, H. Li, H. Li, H. B. Li, H. J. Li,H. N. Li,J. Q. Li, J. S. Li,J. W. Li,Ke Li,L. J Li,L. K. Li,Lei Li, M. H. Li,P. R. Li, S. X. Li, S. Y. Li,T. Li,W. D. Li,W. G. Li, X. H. Li, X. L. Li,Xiaoyu Li,Z. Y. Li,H. Liang,H. Liang,H. Liang,Y. F. Liang,Y. T. Liang,G. R. Liao,L. Z. Liao,J. Libby,A. Limphirat,C. X. Lin,D. X. Lin,T. Lin, B. J. Liu,C. X. Liu,D. Liu,F. H. Liu,Fang Liu,Feng Liu,G. M. Liu,H. Liu,H. M. Liu, Huanhuan Liu, Huihui Liu, J. B. Liu,J. L. Liu, J. Y. Liu,K. Liu,K. Y. Liu,Ke Liu,L. Liu, M. H. Liu,P. L. Liu,Q. Liu, S. B. Liu,T. Liu,W. K. Liu, W. M. Liu,X. Liu,Y. Liu,Y. B. Liu,Z. A. Liu,Z. Q. Liu,X. C. Lou,F. X. Lu,H. J. Lu, J. G. Lu,X. L. Lu,Y. Lu,Y. P. Lu,Z. H. Lu, C. L. Luo,M. X. Luo,T. Luo,X. L. Luo,X. R. Lyu,Y. F. Lyu,F. C. Ma,H. L. Ma,L. L. Ma,M. M. Ma,Q. M. Ma, R. Q. Ma, R. T. Ma,X. Y. Ma,Y. Ma,F. E. Maas,M. Maggiora,S. Maldaner,S. Malde,Q. A. Malik,A. Mangoni,Y. J. Mao,Z. P. Mao,S. Marcello,Z. X. Meng,J. G. Messchendorp,G. Mezzadri,H. Miao,T. J. Min,R. E. Mitchell,X. H. Mo,N. Yu. Muchnoi,H. Muramatsu,Y. Nefedov,F. Nerling,I. B. Nikolaev,Z. Ning,S. Nisar,Y. Niu,S. L. Olsen,Q. Ouyang,S. Pacetti,X. Pan,Y. Pan,A. Pathak,A. Pathak,M. Pelizaeus,H. P. Peng,K. Peters,J. Pettersson,J. L. Ping,R. G. Ping,S. Plura,S. Pogodin,R. Poling,V. Prasad,H. Qi,H. R. Qi,M. Qi,T. Y. Qi,S. Qian,W. B. Qian,Z. Qian,C. F. Qiao,J. J. Qin, L. Q. Qin,X. P. Qin,X. S. Qin,Z. H. Qin,J. F. Qiu,S. Q. Qu,S. Q. Qu,K. H. Rashid,C. F. Redmer,K. J. Ren,A. Rivetti,V. Rodin, M. Rolo,G. Rong,Ch. Rosner,S. N. Ruan,H. S. Sang,A. Sarantsev,Y. Schelhaas, C. Schnier,K. Schoenning,M. Scodeggio, K. Y. Shan,W. Shan,X. Y. Shan, J. F. Shangguan,L. G. Shao,M. Shao,C. P. Shen, H. F. Shen,X. Y. Shen,B. -A. Shi,H. C. Shi,R. S. Shi,X. Shi, X. D Shi,J. J. Song,W. M. Song,Y. X. Song,S. Sosio,S. Spataro,F. Stieler,K. X. Su,P. P. Su,Y. -J. Su,G. X. Sun,H. Sun,H. K. Sun, J. F. Sun,L. Sun,S. S. Sun, T. Sun,W. Y. Sun,X Sun, Y. J. Sun,Y. Z. Sun,Z. T. Sun,Y. H. Tan,Y. X. Tan,C. J. Tang,G. Y. Tang,J. Tang,L. Y Tao,Q. T. Tao, J. X. Teng,V. Thoren,W. H. Tian,Y. T. Tian,I. Uman, B. Wang,B. L. Wang, D. Y. Wang,F. Wang,H. J. Wang,H. P. Wang,K. Wang,L. L. Wang,M. Wang,M. Z. Wang,Meng Wang,S. Wang,T. Wang,T. J. Wang,W. Wang,W. H. Wang,W. P. Wang,X. Wang, X. F. Wang,X. L. Wang, Y. D. Wang,Y. F. Wang, Y. H. Wang, Y. Q. Wang,Ying Wang,Z. Wang, Z. Y. Wang, Ziyi Wang,D. H. Wei,F. Weidner,S. P. Wen,D. J. White,U. Wiedner,G. Wilkinson,M. Wolke,L. Wollenberg,J. F. Wu,L. H. Wu,L. J. Wu,X. Wu,X. H. Wu,Y. Wu,Z. Wu,L. Xia,T. Xiang,D. Xiao,H. Xiao,S. Y. Xiao,Y. L. Xiao,Z. J. Xiao,X. H. Xie,Y. Xie,Y. G. Xie,Y. H. Xie,Z. P. Xie,T. Y. Xing,C. F. Xu, C. J. Xu,G. F. Xu,Q. J. Xu,S. Y. Xu,X. P. Xu,Y. C. Xu,F. Yan, L. Yan,W. B. Yan,W. C. Yan, H. J. Yang, H. L. Yang, H. X. Yang,L. Yang, S. L. Yang, Y. X. Yang,Yifan Yang,M. Ye,M. H. Ye,J. H. Yin,Z. Y. You, B. X. Yu,C. X. Yu,G. Yu,T. Yu, C. Z. Yuan,L. Yuan,S. C. Yuan, X. Q. Yuan,Y. Yuan,Z. Y. Yuan, C. X. Yue,A. A. Zafar,F. R. Zeng,X. Zeng Zeng,Y. Zeng,Y. H. Zhan, A. Q. Zhang,B. L. Zhang,B. X. Zhang,G. Y. Zhang,H. Zhang,H. H. Zhang,H. H. Zhang,H. Y. Zhang, J. L. Zhang, J. Q. Zhang,J. W. Zhang, J. X. Zhang,J. Y. Zhang,J. Z. Zhang,Jianyu Zhang,Jiawei Zhang, L. M. Zhang,L. Q. Zhang,Lei Zhang,P. Zhang,Q. Y. Zhang,Shulei Zhang,X. D. Zhang,X. M. Zhang,X. Y. Zhang,X. Y. Zhang,Y. Zhang,Y. T. Zhang,Y. H. Zhang,Yan Zhang, Yao Zhang, Z. H. Zhang,Z. Y. Zhang,Z. Y. Zhang,G. Zhao,J. Zhao, J. Y. Zhao, J. Z. Zhao,Lei Zhao,Ling Zhao,M. G. Zhao,Q. Zhao,S. J. Zhao,Y. B. Zhao,Y. X. Zhao,Z. G. Zhao,A. Zhemchugov,B. Zheng, J. P. Zheng,Y. H. Zheng,B. Zhong,C. Zhong, X. Zhong,H. Zhou,L. P. Zhou, X. Zhou, X. K. Zhou, X. R. Zhou,X. Y. Zhou,Y. Z. Zhou,J. Zhu, K. Zhu,K. J. Zhu,L. X. Zhu,S. H. Zhu,T. J. Zhu,W. J. Zhu,Y. C. Zhu,Z. A. Zhu,B. S. Zou,J. H. Zou

arxiv（2021）

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摘要
Using a data sample of 4.481× 10^8 ψ^' events collected with the BESIII detector, we report the first observation of the four-lepton-decays J/ψ→ e^+e^-e^+e^- and J/ψ→ e^+e^-μ^+μ^- utilizing the process ψ^'→π^+π^- J/ψ. The branching fractions are determined to be [5.48±0.31 ( stat)±0.45 ( syst)]× 10^-5 and [3.53 ±0.22 ( stat)±0.13 ( syst)]× 10^-5, respectively. The results are consistent with theoretical predictions. No significant signal is observed for J/ψ→μ^+μ^-μ^+μ^-, and an upper limit on the branching fraction is set at 1.6× 10^-6 at the 90% confidence level. A CP asymmetry observable is constructed for the first two channels, which is measured to be (-0.012±0.054±0.010) and (0.062±0.059±0.006), respectively. No evidence for CP violation is observed in this process.
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