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Bai, X. H.; Ban, Y.; Boyko, I.; Cai, X.; Chelkov, G.; Chen, S. J.; Dedovich, D.; Denig, A.; Ding, Y.; Fang, J.; Fang, Y.; Felici, G.; Gao, Y.; Gao, Y. G.; Gong, L.; Gu, M. H.; Gu, Y. T.; Hüsken, N.; Hou, G. Y.; Hu, Y.; Ikegami Andersson, W.; Irshad, M.; Janchiv, S.; Ji, X. L.; Kang, X. S.; Kiuchi, R.; Larin, P.; Lavania, A.; Lei, Z. H.; Leithoff, H.; Li, C.; Li, G.; Li, H. B.; Li, H. J.; Li, J. S.; Li, L.; Li, P. R.; Li, X. L.; Li, Z. Y.; Liu, F.; Liu, K. Y.; Liu, Z. Q.; Lou, X. C.; Luo, P. W.; Ma, Q. M.; Maas, F. E.; Mitchell, R. E.; Muchnoi, N. Yu; Muramatsu, H.; Nefedov, Y.; Pan, X.; Pan, Y.; Peng, H. P.; Qian, W. B.; Qiao, C. F.; Rolo, M.; Shan, D. C.; Shao, M.; Shen, H. F.; Shen, X. Y.; Shi, H. C.; Sui, F. F.; Sun, W. Y.; Sun, Y. J.; Sun, Y. Z.; Tang, J.; Teng, J. X.; Thoren, V.; Uman, I.; Wang, M.; Wang, M. Z.; Wang, Y. Q.; Wang, Z.; Wiedner, U.; Wollenberg, L.; Wu, L. J.; Xie, X. H.; Xie, Y. G.; Xu, G. F.; Xu, W.; Yan, W. C.; Yang, H. J.; Yang, Y.; Ye, M.; Yu, C. X.; Yuan, Y.; Yuncu, A.; Zeng, X.; Zhang, H. H.; Zhang, L. Q.; Zhang, L.; Zhang, Y.; Zhao, J. Y.; Zhao, M. G.; Zhao, Z. G.; Zhou, L. P.; Zhou, Q.; Zhou, X. K.; Zhu, A. N.; Zhu, W. J.
The journal of high energy physics, 06/2021, Volume: 2021, Issue: 6Journal Article
A bstract Using 10 . 1 × 10 9 J/ψ events produced by the Beijing Electron Positron Collider (BEPCII) at a center-of-mass energy s = 3 . 097 GeV and collected with the BESIII detector, we present a search for the rare semi-leptonic decay J/ψ → D − e + ν e + c.c. No excess of signal above background is observed, and an upper limit on the branching fraction ℬ( J / ψ → D − e + ν e + c . c .) < 7.1 × 10 −8 is obtained at 90% confidence level. This is an improvement of more than two orders of magnitude over the previous best limit.
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