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Bai, X. H.; Bai, Y.; 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.; 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, Cheng; Li, G.; Li, H. B.; Li, H. J.; Li, J. S.; Li, P. R.; Li, X. L.; Liu, K. Y.; Liu, Shuai; Liu, Z. Q.; Lou, X. C.; Luo, P. W.; Ma, Q. M.; Maas, F. E.; Mezzadri, G.; Min, T. J.; Mitchell, R. E.; Muramatsu, H.; Nefedov, Y.; Nerling, F.; Pan, X.; Pathak, A.; Peters, K.; Pogodin, S.; 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, Y. J.; Sun, Y. Z.; Tang, J.; Teng, J. X.; Thoren, V.; Uman, I.; Wang, M.; Wang, M. Z.; Wang, Meng; Wang, Y. Q.; Wang, Ziyi; Wiedner, U.; Wollenberg, L.; Wu, L. J.; Xie, X. H.; Xie, Y. G.; Xu, G. F.; Xu, W.; Yan, W. C.; Yang, H. J.; Ye, M.; Yu, C. X.; Yuan, Y.; Yuncu, A.; Zhang, Guangyi; Zhang, H. H.; Zhang, L. M.; Zhang, S. F.; Zhang, Yan; Zhao, J. Y.; Zhao, Lei; 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, 10/2021, Volume: 2021, Issue: 10Journal Article
A bstract Using a total of 5 . 25 fb − 1 of e + e − collision data with center-of-mass energies from 4.236 to 4.600 GeV, we report the first observation of the process e + e − → ηψ (2 S ) with a statistical significance of 4.9 standard deviations. The data sets were collected by the BESIII detector operating at the BEPCII storage ring. We measure the yield of events integrated over center-of-mass energies and also present the energy dependence of the measured cross section.
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