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The decay branching fractions of $\\chi_{c0,c2} \\to \\gamma\\gamma$ are measured to be $\\mathcal{B}(\\chi_{c0}\\to\\gamma\\gamma) = (1.93 \\pm 0.08 \\pm 0.05 \\pm 0.05)\\times 10^{-4}$ and $\\mathcal{B}(\\chi_{c2}\\to\\gamma\\gamma) = (3.10 \\pm 0.09 \\pm 0.07 \\pm 0.11)\\times 10^{-4} $, which correspond to two-photon decay widths of $\\Gamma_{\\gamma\\gamma}(\\chi_{c0}) = 2.03 \\pm 0.08 \\pm 0.06 \\pm 0.13 ~\\rm{keV}$ and $\\Gamma_{\\gamma\\gamm","authors_text":"A. Amoroso, A. A. Zafar, A. Calcaterra, A. Dbeyssi, A. Denig, A. Julin, A. Khoukaz, A. Kupsc, A. Mustafa, A. Q. Guo, A. Sarantsev, A. Yuncu, A. Zhemchugov, B. C. Ke, BESIII Collaboration: M. Ablikim, B. J. Liu, B. Kopf, B. Liu, B. L. Wang, B. S. Zou, B. T. Tsednee, B. Wang, B. X. Yu, B. X. Zh ang, B. Y. Zhang, B. Zheng, B. Zhong, C. C. Zhang, C. D. Fu, C. Dong, C. F. Qiao, C. F. Redmer, Cheng Li, Ch. Rosner, C. Hu, C. J. Tang, C. Leng, C. Li, C. L. Luo, C. Morales Morales, C. P. Shen, C. Q. Feng, C. Schnier, C. Sowa, C. X. 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Yin, J. H. Zou, Jin Li, J. J. Qin, J. J. Song, J. J. Xu, J. L. Ping, J. L. Zhang, J. M. Bian, J. Min, J. P. Dai, J. Pellegrino, 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. Zhang, J. Zhu, J. Zhuang, J. Z. Zhang, J. Z. Zhao, Ke Liu, K. Goetzen, K. H. Rashid, K. J. Li, K. J. Zhu, K. L. He, K. Li, K. Liu, 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. Gong, L. H. Wu, Ling Zhao, L. J. Wu, L. Koch, L. Lavezzi, L. L. Ma, L. L. Wang, L. Sun, L. S. Wang, L. Xia, L. Xu, L. Yan, L. Yang, L. Y. Dong, L. Zhang, L. Zhou, L. Zotti, M. Albrecht, M. Bertani, M. Destefanis, M. Fritsch, M. Greco, M. G. Zhao, M. H. Gu, M. H. Ye, M. Kavatsyuk, M. Kornicer, M. Kuemmel, M. Kuhlmann, M. Lara, M. L. Chen, M. Maggiora, M. M. Ma, M. N. Achasov, M. Pelizaeus, M. Qi, M. Richter, M. Ripka, M. Rolo, M. Savri\\'e, M. Shao, M. Tiemens, M. Wang, M. Wolke, M. X. Luo, M. Y. Dong, M. Ye, N. Berger, N. K alantar-Nayestanaki, N. Qin, N. Yu. Muchnoi, O. Bakina, O. B. Kolcu, O. Cakir, O. Dorjkhaidav, P. F. Duan, P. Kiese, P. Larin, P. L. Li, P. L. Liu, P. L. Wang, P. Musiol, P. Patter i, P. R. Li, P. Wang, P. Weidenkaff, P. X. Shen, Q. A. Malik, Q. An, Q. Gao, Q. Ji, Q. J. Xu, Q. Liu, Q. L. Xiu, Q. M. Ma, Q. N. Xu, Q. Ouyang, Q. P. Ji, Q. Y. Li, Q. Zhao, R. A. Briere, R. Baldini Ferroli, R. E. Mitchell, R. Farinelli, R. G. Ping, R. Kliemt, R. P. Guo, R. Poling, S. A. Cetin, S. Ahmed, S. B. Liu, S. Fegan, S. Gu, S. Han, S. H. Zhu, S. J. Chen, S. Jin, S. J. Zhao, S. L. Niu, S. L. Olsen, S. Marcello, S. Nisar, S. Pacetti, S. P. Wen, S. Qian, S. Q. Zhang, S. S. Fang, S. Sosio, S. Spataro, S. S. Sun, S. X. Du, S. Zhu, T. C. Zhao, T. Held, T. Holtmann, T. Hu, T. Hussain, T. J. Min, T. Johansson, T. Khan, T. Li, T. Ma, T. Weber, U. Wiedner, V. Prasad, W. B. Yan, W. C. Yan, W. D. Li, W. G. Li, W. Gradl, W. Ikegami Andersson, W. J. Zheng, W. K\\\"uhn, W. P. Wang, W. Shan, W. X. Gong, X. A. Xiong, X. B. Ji, X. Cai, X. C. Lou, X. D. Ruan, X. Fang, X. F. Wang, X. H. Mo, X. H. Sun, X. K. Chu, X. K. Zhou, X. L. Gao, X. Liu, X. L. Ji, X. L. Kang, X. L. Li, X. L. Luo, X. L. Zhu, X. N. Li, X. N. Ma, X. P. Xu, X. Q. Hao, X. Q. He, 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. Y. Jiang, X. Y. Ma, X. Y. Niu, X. Y. Shen, X. Y. Song, X. Y. Zhang, X. Y. Zhou, X. Zhou, X. Z. Huang, Y. Bai, 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. Long, Y. F. Wang, Y. Gao, Y. G. Gao, Y. G. Xie, Y. Hu, Y. H. Xie, Y. H. Y an, Y. H. Yang, Y. H. Zhang, Y. H. Zheng, Y. Jin, Y. J. Mao, Y. J. Mo, Y. J. Sun, Y. J. Xiao, Y. K. Heng, Y. K Sun, Y. Lu, Y. M. Ma, Y. Nefedov, Y. Pan, Y. P. Guo, Y. P. Lu, Y. Q. Wang, Y. S. Zhu, Y. T. Gu, Y. T. Liang, Y. T. Zhang, Yu Zhang, Y. Xia, Y. X. Yang, Y. X. Zhou, Y. Y. Liu, 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, Zhiqing Liu, Z. H. Qin, Z. H. Wang, Z. H. Zhang, Z. Jiao, Z. J. Sun, Z. J. Xiao, Z. L. Dou, Z. L. Hou, Z. L. Huang, Z. Ning, Z. P. Mao, Z. P. Zhang, Z. T. Sun, Z. Wang, Z. Wu, Z. X. Meng, Z. Y. Deng, Z. Y. Wang, Z. Y. You, Z. Y. Zhang, Z. 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