Observation of Η′→π+π−μ+μ−

BESIII Collaboration,M. Ablikim,M. N. Achasov,P. Adlarson,S. Ahmed,M. Albrecht,A. Amoroso,Q. An,X. H. Bai,Y. Bai,O. Bakina,R. Baldini Ferroli,I. Balossino,Y. Ban,K. Begzsuren,J. V. Bennett,N. Berger,M. Bertani,D. Bettoni,F. Bianchi,J Biernat,J. Bloms,A. Bortone,I. Boyko,R. A. Briere,H. Cai,X. Cai,A. Calcaterra,G. F. Cao,N. Cao,S. A. Cetin,J. F. Chang,W. L. Chang,G. Chelkov,D. Y. Chen,G. Chen,H. S. Chen, M. L. Chen,S. J. Chen,X. R. Chen,Y. B. Chen,W. S. Cheng,G. Cibinetto,F. Cossio,X. F. Cui,H. L. Dai,J. P. Dai,X. C. Dai,A. Dbeyssi,R. E. de Boer,D. Dedovich,Z. Y. Deng,A. Denig,I. Denysenko,M. Destefanis,F. De Mori,Y. Ding,C. Dong,J. Dong,L. Y. Dong,M. Y. Dong,S. X. Du,J. Fang,S. S. Fang,Y. Fang,R. Farinelli,L. Fava,F. Feldbauer,G. Felici,C. Q. Feng,M. Fritsch,C. D. Fu,Y. Fu,X. L. Gao,Y. Gao,Y. G. Gao,I. Garzia,E. M. Gersabeck,A. Gilman,K. Goetzen,L. Gong,W. X. Gong,W. Gradl,M. Greco,L. M. Gu,M. H. Gu,S. Gu,Y. T. Gu,C. Y Guan,A. Q. Guo,L. B. Guo,R. P. Guo,Y. P. Guo,A. Guskov,S. Han,T. T. Han,T. Z. Han,X. Q. Hao,F. A. Harris,N. Hüsken,K. L. He,F. H. Heinsius,T. Held,Y. K. Heng,M. Himmelreich,T. Holtmann,Y. R. Hou,Z. L. Hou,H. M. Hu,J. F. Hu,T. Hu,Y. Hu,G. S. Huang,L. Q. Huang,X. T. Huang,Y. P. Huang,Z. Huang,T. Hussain,W. Ikegami Andersson,W. Imoehl,M. Irshad,S. Jaeger,S. Janchiv,Q. Ji,Q. P. Ji,X. B. Ji,X. L. Ji,Y. Y. Ji,H. B. Jiang,X. S. Jiang,J. B. Jiao,Z. Jiao,S. Jin,Y. Jin,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,M. G. Kurth,W. Kühn,J. J. Lane,J. S. Lange,P. Larin,A. Lavania,L. Lavezzi,H. Leithoff,M. Lellmann,T. Lenz,C. Li,C. H. Li,Cheng Li,D. M. Li,F. Li,G. Li,H. Li,H. B. Li,H. J. Li,J. L. Li,J. Q. Li,Ke Li,L. K. Li,Lei Li,P. L. Li,P. R. Li,S. Y. Li,W. D. Li,W. G. Li,X. H. Li,X. L. Li,Z. Y. Li,H. Liang,Y. F. Liang,Y. T. Liang,G. R. Liao,L. Z. Liao,J. Libby,C. X. Lin,B. Liu,B. J. Liu,C. X. Liu,D. Liu,D. Y. Liu,F. H. Liu,Fang Liu,Feng Liu,H. B. Liu,H. M. Liu,Huanhuan Liu,Huihui Liu,J. B. Liu,J. Y. Liu,K. Liu,K. Y. Liu,Ke Liu,L. Liu,Q. Liu,S. B. Liu,Shuai Liu,T. Liu,W. M. Liu,X. Liu,Y. B. Liu,Z. A. Liu,Z. Q. Liu,Y. F. Long,X. C. Lou,F. X. Lu,H. J. Lu,J. D. Lu,J. G. Lu,X. L. Lu,Y. Lu,Y. P. Lu,C. L. Luo,M. X. Luo,P. W. Luo,T. Luo,X. L. Luo,S. Lusso,X. R. Lyu,F. C. Ma,H. L. Ma,L. L. Ma,M. M. Ma,Q. M. Ma,R. Q. Ma,R. T. Ma,X. N. Ma,X. X. Ma,X. Y. Ma,Y. M. Ma,F. E. Maas,M. Maggiora,S. Maldaner,S. Malde,A. Mangoni,Y. J. Mao,Z. P. Mao,S. Marcello,Z. X. Meng,J. G. Messchendorp,G. Mezzadri,T. J. Min,R. E. Mitchell,X. H. Mo,Y. J. Mo,N. Yu. Muchnoi,H. Muramatsu,S. Nakhoul,Y. Nefedov,F. Nerling,I. B. Nikolaev,Z. Ning,S. Nisar,S. L. Olsen,Q. Ouyang,S. Pacetti,X. Pan,Y. Pan,A. Pathak,P. Patteri,M. Pelizaeus,H. P. Peng,K. Peters,J. Pettersson,J. L. Ping,R. G. Ping,A. Pitka,R. Poling,V. Prasad,H. Qi,H. R. Qi,M. Qi,T. Y. Qi,S. Qian,W. B. Qian,Z. Qian,C. F. Qiao,L. Q. Qin,X. S. Qin,Z. H. Qin,J. F. Qiu,S. Q. Qu,K. Ravindran,C. F. Redmer,A. Rivetti,V. Rodin, M. Rolo,G. Rong,Ch. Rosner,M. Rump, A. Sarantsev,Y. Schelhaas, C. Schnier,K. Schoenning,D. C. Shan,W. Shan,X. Y. Shan,M. Shao, C. P. Shen,P. X. Shen,X. Y. Shen,H. C. Shi,R. S. Shi,X. Shi,X. D Shi,J. J. Song, Q. Q. Song,W. M. Song,Y. X. Song,S. Sosio,S. Spataro,F. F. Sui,G. X. Sun, J. F. Sun,L. Sun,S. S. Sun,T. Sun,W. Y. Sun,X Sun,Y. J. Sun,Y. K. Sun,Y. Z. Sun,Z. T. Sun,Y. H. Tan,Y. X. Tan,C. J. Tang, G. Y. Tang,J. Tang,J. X. Teng,V. Thoren,I. Uman,B. Wang,B. L. Wang,C. W. Wang,D. Y. Wang,H. P. Wang,K. Wang,L. L. Wang,M. Wang,M. Z. Wang,Meng Wang,W. H. Wang,W. P. Wang,X. Wang,X. F. Wang,X. L. Wang,Y. Wang,Y. D. Wang,Y. F. Wang,Y. Q. Wang,Z. Wang,Z. Y. Wang,Ziyi Wang,Zongyuan Wang,D. H. Wei,P. Weidenkaff,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,Z. Wu,L. Xia,H. Xiao,S. Y. Xiao,Y. J. Xiao,Z. J. Xiao,X. H. Xie,Y. G. Xie,Y. H. Xie,T. Y. Xing,X. A. Xiong,G. F. Xu,J. J. Xu,Q. J. Xu,W. Xu,X. P. Xu,Y. C. Xu,F. Yan,L. Yan,W. B. Yan,W. C. Yan,Xu Yan, H. J. Yang,H. X. Yang,L. Yang,R. X. Yang,S. L. Yang,Y. H. Yang,Y. X. Yang,Yifan Yang,Zhi Yang,M. Ye,M. H. Ye,J. H. Yin,Z. Y. You,B. X. Yu,C. X. Yu,G. Yu,J. S. Yu,T. Yu,C. Z. Yuan,W. Yuan,X. Q. Yuan,Y. Yuan,Z. Y. Yuan,C. X. Yue,A. Yuncu,A. A. Zafar,Y. Zeng,B. X. Zhang,Guangyi Zhang,H. Zhang,H. H. Zhang,H. Y. Zhang,J. L. Zhang, J. Q. Zhang,J. W. Zhang,J. Y. Zhang,J. Z. Zhang,Jianyu Zhang,Jiawei Zhang,Lei Zhang,S. Zhang,S. F. Zhang, T. J. Zhang,X. Y. Zhang,Y. Zhang,Y. H. Zhang,Y. T. Zhang,Yan Zhang,Yao Zhang,Yi Zhang,Z. H. 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. Zheng,Y. H. Zheng,B. Zhong,C. Zhong,L. P. Zhou,Q. Zhou,X. Zhou,X. K. Zhou,X. R. Zhou,A. N. Zhu,J. Zhu,K. Zhu,K. J. Zhu,S. H. Zhu, W. J. Zhu,Y. C. Zhu,Z. A. Zhu,B. S. Zou,J. H. Zou

Physical Review D（2021）

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摘要

Using (1310.6 ± 7.0) × 10^6 J/ψ events acquired with the BESIII detector at the BEPCII storage rings, the decay η^'→π^+π^-μ^+μ^- is observed for the first time with a significance of 8σ via the process J/ψ→γη'. We measure the branching fraction of η^'→π^+π^-μ^+μ^- to be ℬ(η^'→π^+π^-μ^+μ^-)=(1.97±0.33(stat.)±0.18(syst.))×10^-5, where the first and second uncertainties are statistical and systematic, respectively.

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