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Achasov, M. N.; Adlarson, P.; Ahmed, S.; Amoroso, A.; Bai, Y.; Bennett, J. V.; Bertani, M.; Cai, X.; Calcaterra, A.; Chen, H. S.; Cibinetto, G.; Cui, X. F.; Dai, H. L.; De Mori, F.; Farinelli, R.; Felici, G.; Gilman, A.; Guan, C. Y.; Guo, A. Q.; Holtmann, T.; Hu, Y.; Huang, L. Q.; Irshad, M.; Jaeger, S.; Ji, X. B.; Jiang, H. B.; Johansson, T.; Kiese, P.; Koch, L.; Kühn, W.; Larin, P.; Lenz, T.; Li, Cheng; Li, J. L.; Li, Ke; Li, Lei; Li, W. G.; Liang, H.; Libby, J.; Liu, H. M.; Liu, Huanhuan; Liu, K. Y.; Liu, T.; Liu, Z. A.; Lu, J. D.; Lu, Y.; Luo, X. L.; Ma, M. M.; Ma, X. N.; Ma, X. Y.; Ma, Y. M.; Malde, S.; Messchendorp, J. G.; Pathak, A.; Pettersson, J.; Ping, R. G.; Qi, H.; Qi, H. R.; Qiao, C. F.; Qin, L. Q.; Qu, S. Q.; Ravindran, K.; Rolo, M.; Schelhaas, Y.; Schnier, C.; Schoenning, K.; Shen, X. Y.; Shi, H. C.; Sosio, S.; Spataro, S.; Sun, L.; Tan, Y. H.; Wang, B.; Wei, D. H.; Weidenkaff, P.; Wiedner, U.; Wilkinson, G.; Wu, L. J.; Xiao, H.; Xiao, Y. J.; Xu, Q. J.; Yang, H. X.; Yang, R. X.; Yang, Y. X.; Yang, Yifan; Ye, M.; Ye, M. H.; Yu, T.; Yuan, Y.; Yue, C. X.; Zeng, Y.; Zhang, J. L.; Zhang, S. F.; Zhang, Y.; Zhang, Y. H.; Zhao, Lei; Zheng, B.; Zhu, A. N.; Zhu, W. J.; Zou, B. S.
Physical review. D, 04/2021, Volume: 103, Issue: 7Journal Article
Using ( 1310.6 ± 7.0 ) × 106 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 8 σ via the process J / ψ → γ η ′ . We measure the branching fraction of η ′ → π+ π−μ+μ− to be B ( η ′ → π+ π−μ+μ− ) = ( 1.97 ± 0.33 ( stat ) ± 0.19 ( syst ) ) × 10−5, where the first and second uncertainties are statistical and systematic, respectively.
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