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Achasov, M. N.; Ahmed, S.; Amoroso, A.; Ban, Y.; Cai, X.; Calcaterra, A.; Chen, H. S.; Chen, Z. J.; De Mori, F.; Fava, L.; Felici, G.; Greco, M.; Gu, L. M.; Hao, X. Q.; He, K. L.; Heinsius, F. H.; Hou, Z. L.; Hu, H. M.; Hu, T.; Janchiv, S.; Jin, Y.; Ke, B. C.; Keshk, I. K.; Kurth, M. G.; Lane, J. J.; Lei, Z. H.; Li, C.; Li, H. B.; Li, X. H.; Li, Xiaoyu; Liao, L. Z.; Liu, C. X.; Liu, F. H.; Liu, J. B.; Liu, K.; Liu, Y. B.; Luo, C. L.; Luo, M. X.; Luo, T.; Lyu, X. R.; Maldaner, S.; Meng, Z. X.; Min, T. J.; Mitchell, R. E.; Mo, Y. J.; Muramatsu, H.; Nakhoul, S.; Nefedov, Y.; Nerling, F.; Nisar, S.; Pan, X.; Qi, M.; Qi, T. Y.; Qin, X. P.; Qin, Z. H.; Rashid, K. H.; Sang, H. S.; Schnier, C.; Shen, X. Y.; Shi, H. C.; Song, W. M.; Sosio, S.; Sun, L.; Sun, Y. K.; Sun, Z. T.; Uman, I.; Wang, M.; Wang, W.; Wang, X.; Wang, Y.; Wang, Y. Q.; Wang, Z.; Wang, Ziyi; Xiao, S. Y.; Xie, Y. G.; Yan, F.; Yang, H. X.; Yang, Y. X.; Yang, Yifan; Ye, M.; Ye, M. H.; Yu, C. X.; Yuan, L.; Yuan, Y.; Yue, C. X.; Zeng, Y.; Zhang, J. L.; Zhang, Shulei; Zhang, Yao; Zhang, Z. Y.; Zhao, J. Y.; Zhao, M. G.; Zhao, Z. G.; Zheng, B.; Zhou, Q.; Zhou, X. K.; Zhu, J.; Zhu, S. H.; Zhu, T. J.; Zhu, Z. A.
Physical review. D, 06/2021, Volume: 103, Issue: 11Journal Article
A search for the charged lepton flavor violating decay J/ψ → e± τ∓ with τ∓ → π∓ π0 ντ is performed with about 10 × 10 9 J/ψ events collected with the BESIII detector at the BEPCII. No significant signal is observed, and an upper limit is set on the branching fraction B (J/ψ → e± τ∓) < 7.5 × 10−8 at the 90% confidence level. This improves the previously published limit by two orders of magnitude.
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