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The $\\eta'$ mesons are produced via the $J/\\psi \\to \\gamma \\eta'$ decay process. The ratio $\\Gamma(\\eta' \\to \\gamma e^+ e^-)/\\Gamma(\\eta'\\to\\gamma\\gamma)$ is measured to be $(2.13\\pm0.09(\\text{stat.})\\pm0.07(\\text{sys.}))\\times10^{-2}$. This corresponds to a branching fraction ${\\cal B}(\\eta' \\to \\gamma e^+e^-)= (4.69 \\pm0.20(\\text{stat.})\\pm0.23(\\text{sys.}))\\times10^{-4}$. The transition form factor is extracted and differen","authors_text":"A. Amoroso, A. A. Zafar, A. Calcaterra, A. Dbeyssi, A. Denig, A. Hafner, A. Julin, A. Kupsc, A. Q. Guo, A. Sarantsev, A. Yuncu, A. Zallo, A. Zhemchugov, B. C. Ke, B. J. Liu, B. Kloss, B. Kopf, B. L. Wang, B. S. Zou, B. Wang, B. X. Yu, B. X. Zhang, B. Y. Zhang, B. Zheng, B. Zhong, C. C. Zhang, C. D. Fu, C. Dong, C. F. Qiao, C. F. Redmer, C. Geng, Cheng Li, C. H. Li, C. Hu, C. J. Tang, C. Leng, C. L. Luo, C. Morales Morales, C. P. Shen, C. Q. Feng, C. X. Liu, C. X. Yu, C. Zhang, C. Z. Yuan, D. Bettoni, D. Cronin-Hennessy, D. Dedovich, D. H. Wei, D. H. Zhang, D. J. Ambrose, D. M. Li, D. P. Jin, D. Toth, D. Wang, D. W. Bennett, D. Xiao, D. X. Lin, D. Y. Wang, E. Boger, E. Fioravanti, E. H. Thorndike, F. A. Harris, Fang Liu, F. Bianchi, F. C. Ma, F. De Mori, F. E. Maas, Feng Liu, F. F. An, F. Feldbauer, F. H. Liu, F. Li, F. Nerling, G. Chelkov, G. Chen, G. Cibinetto, G. F. Cao, G. Felici, G. F. Xu, G. Li, G. M. Huang, G. R. Liao, G. Rong, G. S. Huang, G. S. Varner, G. X. Sun, G. Zhao, H. B. Li, H. B. Liu, H. Cai, H. H. Liu, H. H. Zhang, H. J. Lu, H. L. Dai, H. Liang, H. L. Ma, H. Loehner, H. L. Ren, H. M. Hu, H. M. Liu, H. Muramatsu, H. P. Cheng, H. P. Huang, H. P. Peng, H. S. Chen, H. W. Yu, H. X. Yang, H. Y. Chen, H. Ye, H. Y. Sheng, H. Y. Zhang, I. B. Nikolaev, I. Boyko, I. Denysenko, I. Garzia, I. Tapan, I. Uman, J. B. Jiao, J. B. Wei, J. C. Chen, J. C. Li, J. Dong, J. Fang, J. F. Chang, J. F. Hu, J. F. Qiu, J. F. Sun, J. G. Lu, J. G. Messchendorp, J. H. Yin, J. H. Zou, Jin Li, J. J. Zhang, J. Liu, J. L. Ping, J. L. Zhang, J. M. Bian, J. Min, J. P. Dai, J. Pettersson, J. P. Liu, J. P. Zheng, J. Q. Zhang, J. S. Huang, J. S. Lange, J. S. Yu, J. V. Bennett, J. W. Zhang, J. W. Zhao, J. Y. Liu, J. Y. Zhang, J. Y. Zhao, J. Z. Bai, J. Z. Fan, J. Zhuang, J. Z. Zhang, J. Z. Zhao, K. Goetzen, K. H. Rashid, K. J. Zhu, K. L. He, K. Li, K. Liu, K. Moriya, K. Peters, K. Schoenning, K. Wang, K. Y. Liu, K. Zhang, K. Zhu, L. B. Guo, L. D. Liu, Lei Li, Lei Zhao, L. Fava, L. G. Xia, L. H. Wu, Ling Zhao, Li Zhou, L. L. Jiang, L. L. Ma, L. L. Wang, L. Q. Qin, L. S. Wang, L. W. Jiang, L. Xu, L. Yan, L. Yang, L. Y. Dong, L. Zhang, L. Zhou, L. Zotti, M. Ablikim, M. Albrecht, M. Bertani, M. Destefanis, M. Fritsch, M. Greco, M. G. Zhao, M. H. Gu, M. H. Ye, M. Kavatsyuk, M. Kornicer, M. Lara, M. L. Chen, M. Lv, M. Maggiora, M. N. Achasov, M. Pelizaeus, M. Qi, M. Ripka, M. Savri\\'e, M. Shao, M. Tiemens, M. Ullrich, M. Wang, M. Wolke, M. X. Luo, M. Y. Dong, M. Ye, N. Kalantar-Nayestanaki, N. Qin, N. Yu. Muchnoi, O. Albayrak, O. B. Kolcu, O. Bondarenko, O. Cakir, P. F. Duan, P. Larin, P. L. Liu, P. L. Wang, P. Patteri, P. R. Li, P. Wang, P. Weidenkaff, P. X. Shen, Q. A. Malik, Q. An, Q. Gao, Q. Ji, Q. J. Wang, Q. J. Xu, Q. Liu, Q. L. Xiu, Q. M. Ma, Q. N. Xu, Q. Ouyang, Q. P. Ji, Q. W. Zhao, Q. Zhao, R. A. Briere, R. Baldini Ferroli, R. E. Mitchell, R. G. Ping, R. Kliemt, R. Poling, R. Q. Lu, S. A. Cetin, S. B. Liu, S. G. Wang, S. Han, S. H. Zhang, S. J. Chen, S. Jin, S. J. Zhao, S. L. Niu, S. L. Olsen, S. Ma, S. Marcello, S. Nisar, S. Pacetti, S. P. Wen, S. Qian, S. Schumann, S. S. Fang, S. Sosio, S. Spataro, S. S. Sun, S. X. Du, S. Zhu, T. C. Zhao, T. Held, T. Hu, T. Hussain, T. J. Min, T. Johansson, T. Li, T. Luo, T. Ma, T. Weber, U. Wiedner, V. Santoro, W. B. Yan, W. C. Yan, W. D. Li, W. G. Li, W. Gradl, W. J. Zheng, W. K\\\"uhn, W. Lai, W. L. Yuan, W. M. Song, W. Shan, W. Wang, W. X. Gong, X. B. Ji, X. Cai, X. C. Ai, X. Chen, X. C. Lou, X. D. Ruan, X. Fang, X. F. Wang, X. H. Mo, X. K. Chu, X. K. Zhou, X. Liu, X. L. Ji, X. L. Kang, X. L. Li, X. L. Luo, X. L. Zhu, X. M. Li, X. N. Li, X. N. Ma, X. P. Xu, X. Q. Hao, X. Q. Li, X. R. Chen, X. R. Lyu, X. R. Zhou, X. S. Jiang, X. S. Kang, X. S. Qin, X. Tang, X. T. Huang, X. X. Liu, X. Y. Gao, X. Y. Ma, X. Y. Niu, X. Y. Shen, X. Y. Song, X. Y. Zhang, X. Y. Zhou, X. Zhou, Y. Ban, Y. B. Chen, Y. B. Liu, Y. B. Zhao, Y. C. Zhu, Y. Ding, Y. D. Wang, Y. Fang, Y. F. Liang, Y. F. Wang, Y. Gao, Y. Guo, Y. G. Xie, Y. H. Guan, Y. Hu, Y. Huang, Y. H. Yan, Y. H. Zhang, Y. H. Zheng, Y. J. Mao, Y. J. Mo, Y. J. Sun, Y. K. Heng, Y. L. Han, Y. Lu, Y. Nefedov, Y. N. Pu, Y. P. Guo, Y. P. Lu, Y. Qin, Y. Q. Wang, Y. S. Zhu, Y. T. Gu, Y. T. Liang, Y. T. Zhang, Y. Xia, Y. X. Yang, Y. Yang, Y. Yuan, Y. Zeng, Y. Zhang, Y. Z. Sun, Z. A. Liu, Z. A. Zhu, Z. B. Li, Z. Gao, Z. G. Wang, Z. G. Zhao, Z. Haddadi, Zhiqiang Liu, Zhiqing Liu, Z. H. Qin, Z. H. Wang, Z. H. Zhang, Z. Jiao, Z. J. Sun, Z. J. Xiao, Z. L. Hou, Z. Ning, Z. P. Mao, Z. P. Zhang, Z. T. Sun, Z. Wang, Z. Wu, Z. Y. Deng, Z. Y. He, Z. Y. Wang, Z. Y. 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