Improved measurements of two-photon widths of the χcJ states and helicity analysis for χc2→γγ

Ablikim, M.; Achasov, M. N.; Ahmed, S.; Albrecht, M.; Amoroso, A.; An, F. F.; An, Q.; Bai, J. Z.; Bai, Y.; Bakina, O.; Baldini Ferroli, R.; Ban, Y.; Bennett, D. W.; Bennett, J. V.; Berger, N.; Bertani, M.; Bettoni, D.; Bian, J. M.; Bianchi, F.; Boger, E.; Boyko, I.; Briere, R. A.; Cai, H.; Cai, X.; Cakir, O.; Calcaterra, A.; Cao, G. F.; Cetin, S. A.; Chai, J.; Chang, J. F.; Chelkov, G.; Chen, G.; Chen, H. S.; Chen, J. C.; Chen, M. L.; Chen, S. J.; Chen, X. R.; Chen, Y. B.; Chu, X. K.; Cibinetto, G.; Dai, H. L.; Dai, J. P.; Dbeyssi, A.; Dedovich, D.; Deng, Z. Y.; Denig, A.; Denysenko, I.; Destefanis, M.; De Mori, F.; Ding, Y.; Dong, C.; Dong, J.; Dong, L. Y.; Dong, M. Y.; Dorjkhaidav, O.; Dou, Z. L.; Du, S. X.; Duan, P. F.; Fan, J. Z.; Fang, J.; Fang, S. S.; Fang, X.; Fang, Y.; Farinelli, R.; Fava, L.; Fegan, S.; Feldbauer, F.; Felici, G.; Feng, C. Q.; Fioravanti, E.; Fritsch, M.; Fu, C. D.; Gao, Q.; Gao, X. L.; Gao, Y.; Gao, Y. G.; Gao, Z.; Garzia, I.; Goetzen, K.; Gong, L.; Gong, W. X.; Gradl, W.; Greco, M.; Gu, M. H.; Gu, S.; Gu, Y. T.; Guo, A. Q.; Guo, L. B.; Guo, R. P.; Guo, Y. P.; Haddadi, Z.; Han, S.; Hao, X. Q.; Harris, F. A.; He, K. L.; He, X. Q.; Heinsius, F. H.; Held, T.; Heng, Y. K.; Holtmann, T.; Hou, Z. L.; Hu, C.; Hu, H. M.; Hu, T.; Hu, Y.; Huang, G. S.; Huang, J. S.; Huang, X. T.; Huang, X. Z.; Huang, Z. L.; Hussain, T.; Ikegami Andersson, W.; Ji, Q.; Ji, Q. P.; Ji, X. B.; Ji, X. L.; Jiang, X. S.; Jiang, X. Y.; Jiao, J. B.; Jiao, Z.; Jin, D. P.; Jin, S.; Jin, Y.; Johansson, T.; Julin, A.; Kalantar-Nayestanaki, N.; Kang, X. L.; Kang, X. S.; Kavatsyuk, M.; Ke, B. C.; Khan, T.; Khoukaz, A.; Kiese, P.; Kliemt, R.; Koch, L.; Kolcu, O. B.; Kopf, B.; Kornicer, M.; Kuemmel, M.; Kuhlmann, M.; Kupsc, A.; Kühn, W.; Lange, J. S.; Lara, M.; Larin, P.; Lavezzi, L.; Leithoff, H.; Leng, C.; Li, C.; Li, Cheng; Li, D. M.; Li, F.; Li, F. Y.; Li, G.; Li, H. B.; Li, H. J.; Li, J. C.; Li, Jin; Li, K.; Li, K.; Li, K. J.; Li, Lei; Li, P. L.; Li, P. R.; Li, Q. Y.; Li, T.; Li, W. D.; Li, W. G.; Li, X. L.; Li, X. N.; Li, X. Q.; Li, Z. B.; Liang, H.; Liang, Y. F.; Liang, Y. T.; Liao, G. R.; Lin, D. X.; Liu, B.; Liu, B. J.; Liu, C. X.; Liu, D.; Liu, F. H.; Liu, Fang; Liu, Feng; Liu, H. B.; Liu, H. H.; Liu, H. H.; Liu, H. M.; Liu, J. B.; Liu, J. P.; Liu, J. Y.; Liu, K.; Liu, K. Y.; Liu, Ke; Liu, L. D.; Liu, P. L.; Liu, Q.; Liu, S. B.; Liu, X.; Liu, Y. B.; Liu, Y. Y.; Liu, Z. A.; Liu, Zhiqing; Long, Y. F.; Lou, X. C.; Lu, H. J.; Lu, J. G.; Lu, Y.; Lu, Y. P.; Luo, C. L.; Luo, M. X.; Luo, X. L.; Lyu, X. R.; Ma, F. C.; Ma, H. L.; Ma, L. L.; Ma, M. M.; Ma, Q. M.; Ma, T.; Ma, X. N.; Ma, X. Y.; Ma, Y. M.; Maas, F. E.; Maggiora, M.; Malik, Q. A.; Mao, Y. J.; Mao, Z. P.; Marcello, S.; Meng, Z. X.; Messchendorp, J. G.; Mezzadri, G.; Min, J.; Min, T. J.; Mitchell, R. E.; Mo, X. H.; Mo, Y. J.; Morales Morales, C.; Morello, G.; Muchnoi, N. Yu.; Muramatsu, H.; Musiol, P.; Mustafa, A.; Nefedov, Y.; Nerling, F.; Nikolaev, I. B.; Ning, Z.; Nisar, S.; Niu, S. L.; Niu, X. Y.; Olsen, S. L.; Ouyang, Q.; Pacetti, S.; Pan, Y.; Patteri, P.; Pelizaeus, M.; Pellegrino, J.; Peng, H. P.; Peters, K.; Pettersson, J.; Ping, J. L.; Ping, R. G.; Poling, R.; Prasad, V.; Qi, H. R.; Qi, M.; Qian, S.; Qiao, C. F.; Qin, J. J.; Qin, N.; Qin, X. S.; Qin, Z. H.; Qiu, J. F.; Rashid, K. H.; Redmer, C. F.; Richter, M.; Ripka, M.; Rolo, M.; Rong, G.; Rosner, Ch.; Ruan, X. D.; Sarantsev, A.; Savrié, M.; Schnier, C.; Schoenning, K.; Shan, W.; Shao, M.; Shen, C. P.; Shen, P. X.; Shen, X. Y.; Sheng, H. Y.; Song, J. J.; Song, X. Y.; Sosio, S.; Sowa, C.; Spataro, S.; Sun, G. X.; Sun, J. F.; Sun, L.; Sun, S. S.; Sun, X. H.; Sun, Y. J.; Sun, Y. K.; Sun, Y. Z.; Sun, Z. J.; Sun, Z. T.; Tang, C. J.; Tang, G. Y.; Tang, X.; Tapan, I.; Tiemens, M.; Tsednee, B. T.; Uman, I.; Varner, G. S.; Wang, B.; Wang, B. L.; Wang, D.; Wang, D. Y.; Wang, Dan; Wang, K.; Wang, L. L.; Wang, L. S.; Wang, M.; Wang, P.; Wang, P. L.; Wang, W. P.; Wang, X. F.; Wang, Y. D.; Wang, Y. F.; Wang, Y. Q.; Wang, Z.; Wang, Z. G.; Wang, Z. H.; Wang, Z. Y.; Wang, Z. Y.; Weber, T.; Wei, D. H.; Weidenkaff, P.; Wen, S. P.; Wiedner, U.; Wolke, M.; Wu, L. H.; Wu, L. J.; Wu, Z.; Xia, L.; Xia, Y.; Xiao, D.; Xiao, H.; Xiao, Y. J.; Xiao, Z. J.; Xie, Y. G.; Xie, Y. H.; Xiong, X. A.; Xiu, Q. L.; Xu, G. F.; Xu, J. J.; Xu, L.; Xu, Q. J.; Xu, Q. N.; Xu, X. P.; Yan, L.; Yan, W. B.; Yan, W. C.; Yan, Y. H.; Yang, H. J.; Yang, H. X.; Yang, L.; Yang, Y. H.; Yang, Y. X.; Ye, M.; Ye, M. H.; Yin, J. H.; You, Z. Y.; Yu, B. X.; Yu, C. X.; Yu, J. S.; Yuan, C. Z.; Yuan, Y.; Yuncu, A.; Zafar, A. A.; Zeng, Y.; Zeng, Z.; Zhang, B. X.; Zhang, B. Y.; Zhang, C. C.; Zhang, D. H.; Zhang, H. H.; Zhang, H. Y.; Zhang, J.; Zhang, J. L.; Zhang, J. Q.; Zhang, J. W.; Zhang, J. Y.; Zhang, J. Z.; Zhang, K.; Zhang, L.; Zhang, S. Q.; Zhang, X. Y.; Zhang, Y.; Zhang, Y.; Zhang, Y. H.; Zhang, Y. T.; Zhang, Yu; Zhang, Z. H.; Zhang, Z. P.; Zhang, Z. Y.; Zhao, G.; Zhao, J. W.; Zhao, J. Y.; Zhao, J. Z.; Zhao, Lei; Zhao, Ling; Zhao, M. G.; Zhao, Q.; Zhao, S. J.; Zhao, T. C.; Zhao, Y. B.; Zhao, Z. G.; Zhemchugov, A.; Zheng, B.; Zheng, J. P.; Zheng, W. J.; Zheng, Y. H.; Zhong, B.; Zhou, L.; Zhou, X.; Zhou, X. K.; Zhou, X. R.; Zhou, X. Y.; Zhou, Y. X.; Zhu, J.; Zhu, K.; Zhu, K. J.; Zhu, S.; Zhu, S. H.; Zhu, X. L.; Zhu, Y. C.; Zhu, Y. S.; Zhu, Z. A.; Zhuang, J.; Zotti, L.; Zou, B. S.; Zou, J. H.

doi:10.1103/PhysRevD.96.092007

Title: Improved measurements of two-photon widths of the $χ_{c J}$ states and helicity analysis for $χ_{c 2} \to γ γ$

Abstract

Based on 448.1 x 10⁶ ψ(3686) events collected with the BESIII detector, the decays ψ(3686) → γχ_cJ,χ_cJ → γγ(J = 0,1,2) are studied in this paper. The decay branching fractions of χ_c0,2 → γγ are measured to be β(χ_c0 → γγ) = (1.93 ± 0.08 ± 0.05 ± 0.05) x 10^-4 and β(χ_c2 → γγ) = (3.10 ± 0.09 ± 0.07 ± 0.11) x 10^-4, which correspond to two-photon decay widths of Γ_γγ(χ_c0) = 2.03 ± 0.08 ± 0.06 ± 0.13 keV and Γ_γγ(χ_c2) = 0.60 ± 0.02 ± 0.01 ± 0.04 keV with a ratio of R = Γ_γγ(χ_c2)/Γ_γγ(χ_c0) = 0.295 ± 0.014 ± 0.007 ± 0.027, where the uncertainties are statistical, systematic and associated with the uncertainties of β(ψ(3686) → γχ_c0,2) and the total widths Γ(χ_c0,2), respectively. For the forbidden decay of χ_c1 → γγ, no signal is observed, and an upper limit on the two-photon width is obtained to be Γ_γγ(χ_c1) < 5.3 eV at the 90% confidence level. Finally, the ratio of the two-photon widths between helicity-zero and helicity-two components in the decay χ_c2 → γγ is also measured to be f_0/2 = Γ^λ=0_γγ(χ_c2)/Γ^λ=2_γγ(χ_c2) = (0.0 ± 0.6 ± 1.2) x 10^-2, where the uncertainties aremore »« less

Authors:: Ablikim, M.; Achasov, M. N.; Ahmed, S.; Albrecht, M.; Amoroso, A.; An, F. F.; An, Q.; Bai, J. Z.; Bai, Y.; Bakina, O.; Baldini Ferroli, R.; Ban, Y.; Bennett, D. W.; Bennett, J. V.; Berger, N.; Bertani, M.; Bettoni, D.; Bian, J. M.; Bianchi, F.; Boger, E. more »« less

Publication Date:: Tue Nov 28 00:00:00 EST 2017

Research Org.:: George Washington Univ., Washington, DC (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Org.:: BESIII Collaboration

OSTI Identifier:: 1440860

Alternate Identifier(s):: OSTI ID: 1489057

Grant/Contract Number:: SC0016583; FG02-05ER41374; SC-0010118; SC-0010504; SC-0012069

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review D

Additional Journal Information:: Journal Volume: 96; Journal Issue: 9; Journal ID: ISSN 2470-0010

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; branching fraction; electroweak radiative corrections; leptonic, semileptonic & radiative decays

Citation Formats


                    Ablikim, M., Achasov, M. N., Ahmed, S., Albrecht, M., Amoroso, A., An, F. F., An, Q., Bai, J. Z., Bai, Y., Bakina, O., Baldini Ferroli, R., Ban, Y., Bennett, D. W., Bennett, J. V., Berger, N., Bertani, M., Bettoni, D., Bian, J. M., Bianchi, F., Boger, E., Boyko, I., Briere, R. A., Cai, H., Cai, X., Cakir, O., Calcaterra, A., Cao, G. F., Cetin, S. A., Chai, J., Chang, J. F., Chelkov, G., Chen, G., Chen, H. S., Chen, J. C., Chen, M. L., Chen, S. J., Chen, X. R., Chen, Y. B., Chu, X. K., Cibinetto, G., Dai, H. L., Dai, J. P., Dbeyssi, A., Dedovich, D., Deng, Z. Y., Denig, A., Denysenko, I., Destefanis, M., De Mori, F., Ding, Y., Dong, C., Dong, J., Dong, L. Y., Dong, M. Y., Dorjkhaidav, O., Dou, Z. L., Du, S. X., Duan, P. F., Fan, J. Z., Fang, J., Fang, S. S., Fang, X., Fang, Y., Farinelli, R., Fava, L., Fegan, S., Feldbauer, F., Felici, G., Feng, C. Q., Fioravanti, E., Fritsch, M., Fu, C. D., Gao, Q., Gao, X. L., Gao, Y., Gao, Y. G., Gao, Z., Garzia, I., Goetzen, K., Gong, L., Gong, W. X., Gradl, W., Greco, M., Gu, M. H., Gu, S., Gu, Y. T., Guo, A. Q., Guo, L. B., Guo, R. P., Guo, Y. P., Haddadi, Z., Han, S., Hao, X. Q., Harris, F. A., He, K. L., He, X. Q., Heinsius, F. H., Held, T., Heng, Y. K., Holtmann, T., Hou, Z. L., Hu, C., Hu, H. M., Hu, T., Hu, Y., Huang, G. S., Huang, J. S., Huang, X. T., Huang, X. Z., Huang, Z. L., Hussain, T., Ikegami Andersson, W., Ji, Q., Ji, Q. P., Ji, X. B., Ji, X. L., Jiang, X. S., Jiang, X. Y., Jiao, J. B., Jiao, Z., Jin, D. P., Jin, S., Jin, Y., Johansson, T., Julin, A., Kalantar-Nayestanaki, N., Kang, X. L., Kang, X. S., Kavatsyuk, M., Ke, B. C., Khan, T., Khoukaz, A., Kiese, P., Kliemt, R., Koch, L., Kolcu, O. B., Kopf, B., Kornicer, M., Kuemmel, M., Kuhlmann, M., Kupsc, A., Kühn, W., Lange, J. S., Lara, M., Larin, P., Lavezzi, L., Leithoff, H., Leng, C., Li, C., Li, Cheng, Li, D. M., Li, F., Li, F. Y., Li, G., Li, H. B., Li, H. J., Li, J. C., Li, Jin, Li, K., Li, K., Li, K. J., Li, Lei, Li, P. L., Li, P. R., Li, Q. Y., Li, T., Li, W. D., Li, W. G., Li, X. L., Li, X. N., Li, X. Q., Li, Z. B., Liang, H., Liang, Y. F., Liang, Y. T., Liao, G. R., Lin, D. X., Liu, B., Liu, B. J., Liu, C. X., Liu, D., Liu, F. H., Liu, Fang, Liu, Feng, Liu, H. B., Liu, H. H., Liu, H. H., Liu, H. M., Liu, J. B., Liu, J. P., Liu, J. Y., Liu, K., Liu, K. Y., Liu, Ke, Liu, L. D., Liu, P. L., Liu, Q., Liu, S. B., Liu, X., Liu, Y. B., Liu, Y. Y., Liu, Z. A., Liu, Zhiqing, Long, Y. F., Lou, X. C., Lu, H. J., Lu, J. G., Lu, Y., Lu, Y. P., Luo, C. L., Luo, M. X., Luo, X. L., Lyu, X. R., Ma, F. C., Ma, H. L., Ma, L. L., Ma, M. M., Ma, Q. M., Ma, T., Ma, X. N., Ma, X. Y., Ma, Y. M., Maas, F. E., Maggiora, M., Malik, Q. A., Mao, Y. J., Mao, Z. P., Marcello, S., Meng, Z. X., Messchendorp, J. G., Mezzadri, G., Min, J., Min, T. J., Mitchell, R. E., Mo, X. H., Mo, Y. J., Morales Morales, C., Morello, G., Muchnoi, N. Yu., Muramatsu, H., Musiol, P., Mustafa, A., Nefedov, Y., Nerling, F., Nikolaev, I. B., Ning, Z., Nisar, S., Niu, S. L., Niu, X. Y., Olsen, S. L., Ouyang, Q., Pacetti, S., Pan, Y., Patteri, P., Pelizaeus, M., Pellegrino, J., Peng, H. P., Peters, K., Pettersson, J., Ping, J. L., Ping, R. G., Poling, R., Prasad, V., Qi, H. R., Qi, M., Qian, S., Qiao, C. F., Qin, J. J., Qin, N., Qin, X. S., Qin, Z. H., Qiu, J. F., Rashid, K. H., Redmer, C. F., Richter, M., Ripka, M., Rolo, M., Rong, G., Rosner, Ch., Ruan, X. D., Sarantsev, A., Savrié, M., Schnier, C., Schoenning, K., Shan, W., Shao, M., Shen, C. P., Shen, P. X., Shen, X. Y., Sheng, H. Y., Song, J. J., Song, X. Y., Sosio, S., Sowa, C., Spataro, S., Sun, G. X., Sun, J. F., Sun, L., Sun, S. S., Sun, X. H., Sun, Y. J., Sun, Y. K., Sun, Y. Z., Sun, Z. J., Sun, Z. T., Tang, C. J., Tang, G. Y., Tang, X., Tapan, I., Tiemens, M., Tsednee, B. T., Uman, I., Varner, G. S., Wang, B., Wang, B. L., Wang, D., Wang, D. Y., Wang, Dan, Wang, K., Wang, L. L., Wang, L. S., Wang, M., Wang, P., Wang, P. L., Wang, W. P., Wang, X. F., Wang, Y. D., Wang, Y. F., Wang, Y. Q., Wang, Z., Wang, Z. G., Wang, Z. H., Wang, Z. Y., Wang, Z. Y., Weber, T., Wei, D. H., Weidenkaff, P., Wen, S. P., Wiedner, U., Wolke, M., Wu, L. H., Wu, L. J., Wu, Z., Xia, L., Xia, Y., Xiao, D., Xiao, H., Xiao, Y. J., Xiao, Z. J., Xie, Y. G., Xie, Y. H., Xiong, X. A., Xiu, Q. L., Xu, G. F., Xu, J. J., Xu, L., Xu, Q. J., Xu, Q. N., Xu, X. P., Yan, L., Yan, W. B., Yan, W. C., Yan, Y. H., Yang, H. J., Yang, H. X., Yang, L., Yang, Y. H., Yang, Y. X., Ye, M., Ye, M. H., Yin, J. H., You, Z. Y., Yu, B. X., Yu, C. X., Yu, J. S., Yuan, C. Z., Yuan, Y., Yuncu, A., Zafar, A. A., Zeng, Y., Zeng, Z., Zhang, B. X., Zhang, B. Y., Zhang, C. C., Zhang, D. H., Zhang, H. H., Zhang, H. Y., Zhang, J., Zhang, J. L., Zhang, J. Q., Zhang, J. W., Zhang, J. Y., Zhang, J. Z., Zhang, K., Zhang, L., Zhang, S. Q., Zhang, X. Y., Zhang, Y., Zhang, Y., Zhang, Y. H., Zhang, Y. T., Zhang, Yu, Zhang, Z. H., Zhang, Z. P., Zhang, Z. Y., Zhao, G., Zhao, J. W., Zhao, J. Y., Zhao, J. Z., Zhao, Lei, Zhao, Ling, Zhao, M. G., Zhao, Q., Zhao, S. J., Zhao, T. C., Zhao, Y. B., Zhao, Z. G., Zhemchugov, A., Zheng, B., Zheng, J. P., Zheng, W. J., Zheng, Y. H., Zhong, B., Zhou, L., Zhou, X., Zhou, X. K., Zhou, X. R., Zhou, X. Y., Zhou, Y. X., Zhu, J., Zhu, K., Zhu, K. J., Zhu, S., Zhu, S. H., Zhu, X. L., Zhu, Y. C., Zhu, Y. S., Zhu, Z. A., Zhuang, J., Zotti, L., Zou, B. S., and Zou, J. H. Improved measurements of two-photon widths of the χcJ states and helicity analysis for χc2→γγ.  United States: N. p., 2017. 
Web.  doi:10.1103/PhysRevD.96.092007.

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                    Ablikim, M., Achasov, M. N., Ahmed, S., Albrecht, M., Amoroso, A., An, F. F., An, Q., Bai, J. Z., Bai, Y., Bakina, O., Baldini Ferroli, R., Ban, Y., Bennett, D. W., Bennett, J. V., Berger, N., Bertani, M., Bettoni, D., Bian, J. M., Bianchi, F., Boger, E., Boyko, I., Briere, R. A., Cai, H., Cai, X., Cakir, O., Calcaterra, A., Cao, G. F., Cetin, S. A., Chai, J., Chang, J. F., Chelkov, G., Chen, G., Chen, H. S., Chen, J. C., Chen, M. L., Chen, S. J., Chen, X. R., Chen, Y. B., Chu, X. K., Cibinetto, G., Dai, H. L., Dai, J. P., Dbeyssi, A., Dedovich, D., Deng, Z. Y., Denig, A., Denysenko, I., Destefanis, M., De Mori, F., Ding, Y., Dong, C., Dong, J., Dong, L. Y., Dong, M. Y., Dorjkhaidav, O., Dou, Z. L., Du, S. X., Duan, P. F., Fan, J. Z., Fang, J., Fang, S. S., Fang, X., Fang, Y., Farinelli, R., Fava, L., Fegan, S., Feldbauer, F., Felici, G., Feng, C. Q., Fioravanti, E., Fritsch, M., Fu, C. D., Gao, Q., Gao, X. L., Gao, Y., Gao, Y. G., Gao, Z., Garzia, I., Goetzen, K., Gong, L., Gong, W. X., Gradl, W., Greco, M., Gu, M. H., Gu, S., Gu, Y. T., Guo, A. Q., Guo, L. B., Guo, R. P., Guo, Y. P., Haddadi, Z., Han, S., Hao, X. Q., Harris, F. A., He, K. L., He, X. Q., Heinsius, F. H., Held, T., Heng, Y. K., Holtmann, T., Hou, Z. L., Hu, C., Hu, H. M., Hu, T., Hu, Y., Huang, G. S., Huang, J. S., Huang, X. T., Huang, X. Z., Huang, Z. L., Hussain, T., Ikegami Andersson, W., Ji, Q., Ji, Q. P., Ji, X. B., Ji, X. L., Jiang, X. S., Jiang, X. Y., Jiao, J. B., Jiao, Z., Jin, D. P., Jin, S., Jin, Y., Johansson, T., Julin, A., Kalantar-Nayestanaki, N., Kang, X. L., Kang, X. S., Kavatsyuk, M., Ke, B. C., Khan, T., Khoukaz, A., Kiese, P., Kliemt, R., Koch, L., Kolcu, O. B., Kopf, B., Kornicer, M., Kuemmel, M., Kuhlmann, M., Kupsc, A., Kühn, W., Lange, J. S., Lara, M., Larin, P., Lavezzi, L., Leithoff, H., Leng, C., Li, C., Li, Cheng, Li, D. M., Li, F., Li, F. Y., Li, G., Li, H. B., Li, H. J., Li, J. C., Li, Jin, Li, K., Li, K., Li, K. J., Li, Lei, Li, P. L., Li, P. R., Li, Q. Y., Li, T., Li, W. D., Li, W. G., Li, X. L., Li, X. N., Li, X. Q., Li, Z. B., Liang, H., Liang, Y. F., Liang, Y. T., Liao, G. R., Lin, D. X., Liu, B., Liu, B. J., Liu, C. X., Liu, D., Liu, F. H., Liu, Fang, Liu, Feng, Liu, H. B., Liu, H. H., Liu, H. H., Liu, H. M., Liu, J. B., Liu, J. P., Liu, J. Y., Liu, K., Liu, K. Y., Liu, Ke, Liu, L. D., Liu, P. L., Liu, Q., Liu, S. B., Liu, X., Liu, Y. B., Liu, Y. Y., Liu, Z. A., Liu, Zhiqing, Long, Y. F., Lou, X. C., Lu, H. J., Lu, J. G., Lu, Y., Lu, Y. P., Luo, C. L., Luo, M. X., Luo, X. L., Lyu, X. R., Ma, F. C., Ma, H. L., Ma, L. L., Ma, M. M., Ma, Q. M., Ma, T., Ma, X. N., Ma, X. Y., Ma, Y. M., Maas, F. E., Maggiora, M., Malik, Q. A., Mao, Y. J., Mao, Z. P., Marcello, S., Meng, Z. X., Messchendorp, J. G., Mezzadri, G., Min, J., Min, T. J., Mitchell, R. E., Mo, X. H., Mo, Y. J., Morales Morales, C., Morello, G., Muchnoi, N. Yu., Muramatsu, H., Musiol, P., Mustafa, A., Nefedov, Y., Nerling, F., Nikolaev, I. B., Ning, Z., Nisar, S., Niu, S. L., Niu, X. Y., Olsen, S. L., Ouyang, Q., Pacetti, S., Pan, Y., Patteri, P., Pelizaeus, M., Pellegrino, J., Peng, H. P., Peters, K., Pettersson, J., Ping, J. L., Ping, R. G., Poling, R., Prasad, V., Qi, H. R., Qi, M., Qian, S., Qiao, C. F., Qin, J. J., Qin, N., Qin, X. S., Qin, Z. H., Qiu, J. F., Rashid, K. H., Redmer, C. F., Richter, M., Ripka, M., Rolo, M., Rong, G., Rosner, Ch., Ruan, X. D., Sarantsev, A., Savrié, M., Schnier, C., Schoenning, K., Shan, W., Shao, M., Shen, C. P., Shen, P. X., Shen, X. Y., Sheng, H. Y., Song, J. J., Song, X. Y., Sosio, S., Sowa, C., Spataro, S., Sun, G. X., Sun, J. F., Sun, L., Sun, S. S., Sun, X. H., Sun, Y. J., Sun, Y. K., Sun, Y. Z., Sun, Z. J., Sun, Z. T., Tang, C. J., Tang, G. Y., Tang, X., Tapan, I., Tiemens, M., Tsednee, B. T., Uman, I., Varner, G. S., Wang, B., Wang, B. L., Wang, D., Wang, D. Y., Wang, Dan, Wang, K., Wang, L. L., Wang, L. S., Wang, M., Wang, P., Wang, P. L., Wang, W. P., Wang, X. F., Wang, Y. D., Wang, Y. F., Wang, Y. Q., Wang, Z., Wang, Z. G., Wang, Z. H., Wang, Z. Y., Wang, Z. Y., Weber, T., Wei, D. H., Weidenkaff, P., Wen, S. P., Wiedner, U., Wolke, M., Wu, L. H., Wu, L. J., Wu, Z., Xia, L., Xia, Y., Xiao, D., Xiao, H., Xiao, Y. J., Xiao, Z. J., Xie, Y. G., Xie, Y. H., Xiong, X. A., Xiu, Q. L., Xu, G. F., Xu, J. J., Xu, L., Xu, Q. J., Xu, Q. N., Xu, X. P., Yan, L., Yan, W. B., Yan, W. C., Yan, Y. H., Yang, H. J., Yang, H. X., Yang, L., Yang, Y. H., Yang, Y. X., Ye, M., Ye, M. H., Yin, J. H., You, Z. Y., Yu, B. X., Yu, C. X., Yu, J. S., Yuan, C. Z., Yuan, Y., Yuncu, A., Zafar, A. A., Zeng, Y., Zeng, Z., Zhang, B. X., Zhang, B. Y., Zhang, C. C., Zhang, D. H., Zhang, H. H., Zhang, H. Y., Zhang, J., Zhang, J. L., Zhang, J. Q., Zhang, J. W., Zhang, J. Y., Zhang, J. Z., Zhang, K., Zhang, L., Zhang, S. Q., Zhang, X. Y., Zhang, Y., Zhang, Y., Zhang, Y. H., Zhang, Y. T., Zhang, Yu, Zhang, Z. H., Zhang, Z. P., Zhang, Z. Y., Zhao, G., Zhao, J. W., Zhao, J. Y., Zhao, J. Z., Zhao, Lei, Zhao, Ling, Zhao, M. G., Zhao, Q., Zhao, S. J., Zhao, T. C., Zhao, Y. B., Zhao, Z. G., Zhemchugov, A., Zheng, B., Zheng, J. P., Zheng, W. J., Zheng, Y. H., Zhong, B., Zhou, L., Zhou, X., Zhou, X. K., Zhou, X. R., Zhou, X. Y., Zhou, Y. X., Zhu, J., Zhu, K., Zhu, K. J., Zhu, S., Zhu, S. H., Zhu, X. L., Zhu, Y. C., Zhu, Y. S., Zhu, Z. A., Zhuang, J., Zotti, L., Zou, B. S., & Zou, J. H. Improved measurements of two-photon widths of the χcJ states and helicity analysis for χc2→γγ.  United States.  https://doi.org/10.1103/PhysRevD.96.092007

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                    Ablikim, M., Achasov, M. N., Ahmed, S., Albrecht, M., Amoroso, A., An, F. F., An, Q., Bai, J. Z., Bai, Y., Bakina, O., Baldini Ferroli, R., Ban, Y., Bennett, D. W., Bennett, J. V., Berger, N., Bertani, M., Bettoni, D., Bian, J. M., Bianchi, F., Boger, E., Boyko, I., Briere, R. A., Cai, H., Cai, X., Cakir, O., Calcaterra, A., Cao, G. F., Cetin, S. A., Chai, J., Chang, J. F., Chelkov, G., Chen, G., Chen, H. S., Chen, J. C., Chen, M. L., Chen, S. J., Chen, X. R., Chen, Y. B., Chu, X. K., Cibinetto, G., Dai, H. L., Dai, J. P., Dbeyssi, A., Dedovich, D., Deng, Z. Y., Denig, A., Denysenko, I., Destefanis, M., De Mori, F., Ding, Y., Dong, C., Dong, J., Dong, L. Y., Dong, M. Y., Dorjkhaidav, O., Dou, Z. L., Du, S. X., Duan, P. F., Fan, J. Z., Fang, J., Fang, S. S., Fang, X., Fang, Y., Farinelli, R., Fava, L., Fegan, S., Feldbauer, F., Felici, G., Feng, C. Q., Fioravanti, E., Fritsch, M., Fu, C. D., Gao, Q., Gao, X. L., Gao, Y., Gao, Y. G., Gao, Z., Garzia, I., Goetzen, K., Gong, L., Gong, W. X., Gradl, W., Greco, M., Gu, M. H., Gu, S., Gu, Y. T., Guo, A. Q., Guo, L. B., Guo, R. P., Guo, Y. P., Haddadi, Z., Han, S., Hao, X. Q., Harris, F. A., He, K. L., He, X. Q., Heinsius, F. H., Held, T., Heng, Y. K., Holtmann, T., Hou, Z. L., Hu, C., Hu, H. M., Hu, T., Hu, Y., Huang, G. S., Huang, J. S., Huang, X. T., Huang, X. Z., Huang, Z. L., Hussain, T., Ikegami Andersson, W., Ji, Q., Ji, Q. P., Ji, X. B., Ji, X. L., Jiang, X. S., Jiang, X. Y., Jiao, J. B., Jiao, Z., Jin, D. P., Jin, S., Jin, Y., Johansson, T., Julin, A., Kalantar-Nayestanaki, N., Kang, X. L., Kang, X. S., Kavatsyuk, M., Ke, B. C., Khan, T., Khoukaz, A., Kiese, P., Kliemt, R., Koch, L., Kolcu, O. B., Kopf, B., Kornicer, M., Kuemmel, M., Kuhlmann, M., Kupsc, A., Kühn, W., Lange, J. S., Lara, M., Larin, P., Lavezzi, L., Leithoff, H., Leng, C., Li, C., Li, Cheng, Li, D. M., Li, F., Li, F. Y., Li, G., Li, H. B., Li, H. J., Li, J. C., Li, Jin, Li, K., Li, K., Li, K. J., Li, Lei, Li, P. L., Li, P. R., Li, Q. Y., Li, T., Li, W. D., Li, W. G., Li, X. L., Li, X. N., Li, X. Q., Li, Z. B., Liang, H., Liang, Y. F., Liang, Y. T., Liao, G. R., Lin, D. X., Liu, B., Liu, B. J., Liu, C. X., Liu, D., Liu, F. H., Liu, Fang, Liu, Feng, Liu, H. B., Liu, H. H., Liu, H. H., Liu, H. M., Liu, J. B., Liu, J. P., Liu, J. Y., Liu, K., Liu, K. Y., Liu, Ke, Liu, L. D., Liu, P. L., Liu, Q., Liu, S. B., Liu, X., Liu, Y. B., Liu, Y. Y., Liu, Z. A., Liu, Zhiqing, Long, Y. F., Lou, X. C., Lu, H. J., Lu, J. G., Lu, Y., Lu, Y. P., Luo, C. L., Luo, M. X., Luo, X. L., Lyu, X. R., Ma, F. C., Ma, H. L., Ma, L. L., Ma, M. M., Ma, Q. M., Ma, T., Ma, X. N., Ma, X. Y., Ma, Y. M., Maas, F. E., Maggiora, M., Malik, Q. A., Mao, Y. J., Mao, Z. P., Marcello, S., Meng, Z. X., Messchendorp, J. G., Mezzadri, G., Min, J., Min, T. J., Mitchell, R. E., Mo, X. H., Mo, Y. J., Morales Morales, C., Morello, G., Muchnoi, N. Yu., Muramatsu, H., Musiol, P., Mustafa, A., Nefedov, Y., Nerling, F., Nikolaev, I. B., Ning, Z., Nisar, S., Niu, S. L., Niu, X. Y., Olsen, S. L., Ouyang, Q., Pacetti, S., Pan, Y., Patteri, P., Pelizaeus, M., Pellegrino, J., Peng, H. P., Peters, K., Pettersson, J., Ping, J. L., Ping, R. G., Poling, R., Prasad, V., Qi, H. R., Qi, M., Qian, S., Qiao, C. F., Qin, J. J., Qin, N., Qin, X. S., Qin, Z. H., Qiu, J. F., Rashid, K. H., Redmer, C. F., Richter, M., Ripka, M., Rolo, M., Rong, G., Rosner, Ch., Ruan, X. D., Sarantsev, A., Savrié, M., Schnier, C., Schoenning, K., Shan, W., Shao, M., Shen, C. P., Shen, P. X., Shen, X. Y., Sheng, H. Y., Song, J. J., Song, X. Y., Sosio, S., Sowa, C., Spataro, S., Sun, G. X., Sun, J. F., Sun, L., Sun, S. S., Sun, X. H., Sun, Y. J., Sun, Y. K., Sun, Y. Z., Sun, Z. J., Sun, Z. T., Tang, C. J., Tang, G. Y., Tang, X., Tapan, I., Tiemens, M., Tsednee, B. T., Uman, I., Varner, G. S., Wang, B., Wang, B. L., Wang, D., Wang, D. Y., Wang, Dan, Wang, K., Wang, L. L., Wang, L. S., Wang, M., Wang, P., Wang, P. L., Wang, W. P., Wang, X. F., Wang, Y. D., Wang, Y. F., Wang, Y. Q., Wang, Z., Wang, Z. G., Wang, Z. H., Wang, Z. Y., Wang, Z. Y., Weber, T., Wei, D. H., Weidenkaff, P., Wen, S. P., Wiedner, U., Wolke, M., Wu, L. H., Wu, L. J., Wu, Z., Xia, L., Xia, Y., Xiao, D., Xiao, H., Xiao, Y. J., Xiao, Z. J., Xie, Y. G., Xie, Y. H., Xiong, X. A., Xiu, Q. L., Xu, G. F., Xu, J. J., Xu, L., Xu, Q. J., Xu, Q. N., Xu, X. P., Yan, L., Yan, W. B., Yan, W. C., Yan, Y. H., Yang, H. J., Yang, H. X., Yang, L., Yang, Y. H., Yang, Y. X., Ye, M., Ye, M. H., Yin, J. H., You, Z. Y., Yu, B. X., Yu, C. X., Yu, J. S., Yuan, C. Z., Yuan, Y., Yuncu, A., Zafar, A. A., Zeng, Y., Zeng, Z., Zhang, B. X., Zhang, B. Y., Zhang, C. C., Zhang, D. H., Zhang, H. H., Zhang, H. Y., Zhang, J., Zhang, J. L., Zhang, J. Q., Zhang, J. W., Zhang, J. Y., Zhang, J. Z., Zhang, K., Zhang, L., Zhang, S. Q., Zhang, X. Y., Zhang, Y., Zhang, Y., Zhang, Y. H., Zhang, Y. T., Zhang, Yu, Zhang, Z. H., Zhang, Z. P., Zhang, Z. Y., Zhao, G., Zhao, J. W., Zhao, J. Y., Zhao, J. Z., Zhao, Lei, Zhao, Ling, Zhao, M. G., Zhao, Q., Zhao, S. J., Zhao, T. C., Zhao, Y. B., Zhao, Z. G., Zhemchugov, A., Zheng, B., Zheng, J. P., Zheng, W. J., Zheng, Y. H., Zhong, B., Zhou, L., Zhou, X., Zhou, X. K., Zhou, X. R., Zhou, X. Y., Zhou, Y. X., Zhu, J., Zhu, K., Zhu, K. J., Zhu, S., Zhu, S. H., Zhu, X. L., Zhu, Y. C., Zhu, Y. S., Zhu, Z. A., Zhuang, J., Zotti, L., Zou, B. S., and Zou, J. H. Tue .  
"Improved measurements of two-photon widths of the χcJ states and helicity analysis for χc2→γγ".  United States.  https://doi.org/10.1103/PhysRevD.96.092007.  https://www.osti.gov/servlets/purl/1440860.

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@article{osti_1440860,

  title        = {Improved measurements of two-photon widths of the χcJ states and helicity analysis for χc2→γγ},

  author       = {Ablikim, M. and Achasov, M. N. and Ahmed, S. and Albrecht, M. and Amoroso, A. and An, F. F. and An, Q. and Bai, J. Z. and Bai, Y. and Bakina, O. and Baldini Ferroli, R. and Ban, Y. and Bennett, D. W. and Bennett, J. V. and Berger, N. and Bertani, M. and Bettoni, D. and Bian, J. M. and Bianchi, F. and Boger, E. and Boyko, I. and Briere, R. A. and Cai, H. and Cai, X. and Cakir, O. and Calcaterra, A. and Cao, G. F. and Cetin, S. A. and Chai, J. and Chang, J. F. and Chelkov, G. and Chen, G. and Chen, H. S. and Chen, J. C. and Chen, M. L. and Chen, S. J. and Chen, X. R. and Chen, Y. B. and Chu, X. K. and Cibinetto, G. and Dai, H. L. and Dai, J. P. and Dbeyssi, A. and Dedovich, D. and Deng, Z. Y. and Denig, A. and Denysenko, I. and Destefanis, M. and De Mori, F. and Ding, Y. and Dong, C. and Dong, J. and Dong, L. Y. and Dong, M. Y. and Dorjkhaidav, O. and Dou, Z. L. and Du, S. X. and Duan, P. F. and Fan, J. Z. and Fang, J. and Fang, S. S. and Fang, X. and Fang, Y. and Farinelli, R. and Fava, L. and Fegan, S. and Feldbauer, F. and Felici, G. and Feng, C. Q. and Fioravanti, E. and Fritsch, M. and Fu, C. D. and Gao, Q. and Gao, X. L. and Gao, Y. and Gao, Y. G. and Gao, Z. and Garzia, I. and Goetzen, K. and Gong, L. and Gong, W. X. and Gradl, W. and Greco, M. and Gu, M. H. and Gu, S. and Gu, Y. T. and Guo, A. Q. and Guo, L. B. and Guo, R. P. and Guo, Y. P. and Haddadi, Z. and Han, S. and Hao, X. Q. and Harris, F. A. and He, K. L. and He, X. Q. and Heinsius, F. H. and Held, T. and Heng, Y. K. and Holtmann, T. and Hou, Z. L. and Hu, C. and Hu, H. M. and Hu, T. and Hu, Y. and Huang, G. S. and Huang, J. S. and Huang, X. T. and Huang, X. Z. and Huang, Z. L. and Hussain, T. and Ikegami Andersson, W. and Ji, Q. and Ji, Q. P. and Ji, X. B. and Ji, X. L. and Jiang, X. S. and Jiang, X. Y. and Jiao, J. B. and Jiao, Z. and Jin, D. P. and Jin, S. and Jin, Y. and Johansson, T. and Julin, A. and Kalantar-Nayestanaki, N. and Kang, X. L. and Kang, X. S. and Kavatsyuk, M. and Ke, B. C. and Khan, T. and Khoukaz, A. and Kiese, P. and Kliemt, R. and Koch, L. and Kolcu, O. B. and Kopf, B. and Kornicer, M. and Kuemmel, M. and Kuhlmann, M. and Kupsc, A. and Kühn, W. and Lange, J. S. and Lara, M. and Larin, P. and Lavezzi, L. and Leithoff, H. and Leng, C. and Li, C. and Li, Cheng and Li, D. M. and Li, F. and Li, F. Y. and Li, G. and Li, H. B. and Li, H. J. and Li, J. C. and Li, Jin and Li, K. and Li, K. and Li, K. J. and Li, Lei and Li, P. L. and Li, P. R. and Li, Q. Y. and Li, T. and Li, W. D. and Li, W. G. and Li, X. L. and Li, X. N. and Li, X. Q. and Li, Z. B. and Liang, H. and Liang, Y. F. and Liang, Y. T. and Liao, G. R. and Lin, D. X. and Liu, B. and Liu, B. J. and Liu, C. X. and Liu, D. and Liu, F. H. and Liu, Fang and Liu, Feng and Liu, H. B. and Liu, H. H. and Liu, H. H. and Liu, H. M. and Liu, J. B. and Liu, J. P. and Liu, J. Y. and Liu, K. and Liu, K. Y. and Liu, Ke and Liu, L. D. and Liu, P. L. and Liu, Q. and Liu, S. B. and Liu, X. and Liu, Y. B. and Liu, Y. Y. and Liu, Z. A. and Liu, Zhiqing and Long, Y. F. and Lou, X. C. and Lu, H. J. and Lu, J. G. and Lu, Y. and Lu, Y. P. and Luo, C. L. and Luo, M. X. and Luo, X. L. and Lyu, X. R. and Ma, F. C. and Ma, H. L. and Ma, L. L. and Ma, M. M. and Ma, Q. M. and Ma, T. and Ma, X. N. and Ma, X. Y. and Ma, Y. M. and Maas, F. E. and Maggiora, M. and Malik, Q. A. and Mao, Y. J. and Mao, Z. P. and Marcello, S. and Meng, Z. X. and Messchendorp, J. G. and Mezzadri, G. and Min, J. and Min, T. J. and Mitchell, R. E. and Mo, X. H. and Mo, Y. J. and Morales Morales, C. and Morello, G. and Muchnoi, N. Yu. and Muramatsu, H. and Musiol, P. and Mustafa, A. and Nefedov, Y. and Nerling, F. and Nikolaev, I. B. and Ning, Z. and Nisar, S. and Niu, S. L. and Niu, X. Y. and Olsen, S. L. and Ouyang, Q. and Pacetti, S. and Pan, Y. and Patteri, P. and Pelizaeus, M. and Pellegrino, J. and Peng, H. P. and Peters, K. and Pettersson, J. and Ping, J. L. and Ping, R. G. and Poling, R. and Prasad, V. and Qi, H. R. and Qi, M. and Qian, S. and Qiao, C. F. and Qin, J. J. and Qin, N. and Qin, X. S. and Qin, Z. H. and Qiu, J. F. and Rashid, K. H. and Redmer, C. F. and Richter, M. and Ripka, M. and Rolo, M. and Rong, G. and Rosner, Ch. and Ruan, X. D. and Sarantsev, A. and Savrié, M. and Schnier, C. and Schoenning, K. and Shan, W. and Shao, M. and Shen, C. P. and Shen, P. X. and Shen, X. Y. and Sheng, H. Y. and Song, J. J. and Song, X. Y. and Sosio, S. and Sowa, C. and Spataro, S. and Sun, G. X. and Sun, J. F. and Sun, L. and Sun, S. S. and Sun, X. H. and Sun, Y. J. and Sun, Y. K. and Sun, Y. Z. and Sun, Z. J. and Sun, Z. T. and Tang, C. J. and Tang, G. Y. and Tang, X. and Tapan, I. and Tiemens, M. and Tsednee, B. T. and Uman, I. and Varner, G. S. and Wang, B. and Wang, B. L. and Wang, D. and Wang, D. Y. and Wang, Dan and Wang, K. and Wang, L. L. and Wang, L. S. and Wang, M. and Wang, P. and Wang, P. L. and Wang, W. P. and Wang, X. F. and Wang, Y. D. and Wang, Y. F. and Wang, Y. Q. and Wang, Z. and Wang, Z. G. and Wang, Z. H. and Wang, Z. Y. and Wang, Z. Y. and Weber, T. and Wei, D. H. and Weidenkaff, P. and Wen, S. P. and Wiedner, U. and Wolke, M. and Wu, L. H. and Wu, L. J. and Wu, Z. and Xia, L. and Xia, Y. and Xiao, D. and Xiao, H. and Xiao, Y. J. and Xiao, Z. J. and Xie, Y. G. and Xie, Y. H. and Xiong, X. A. and Xiu, Q. L. and Xu, G. F. and Xu, J. J. and Xu, L. and Xu, Q. J. and Xu, Q. N. and Xu, X. P. and Yan, L. and Yan, W. B. and Yan, W. C. and Yan, Y. H. and Yang, H. J. and Yang, H. X. and Yang, L. and Yang, Y. H. and Yang, Y. X. and Ye, M. and Ye, M. H. and Yin, J. H. and You, Z. Y. and Yu, B. X. and Yu, C. X. and Yu, J. S. and Yuan, C. Z. and Yuan, Y. and Yuncu, A. and Zafar, A. A. and Zeng, Y. and Zeng, Z. and Zhang, B. X. and Zhang, B. Y. and Zhang, C. C. and Zhang, D. H. and Zhang, H. H. and Zhang, H. Y. and Zhang, J. and Zhang, J. L. and Zhang, J. Q. and Zhang, J. W. and Zhang, J. Y. and Zhang, J. Z. and Zhang, K. and Zhang, L. and Zhang, S. Q. and Zhang, X. Y. and Zhang, Y. and Zhang, Y. and Zhang, Y. H. and Zhang, Y. T. and Zhang, Yu and Zhang, Z. H. and Zhang, Z. P. and Zhang, Z. Y. and Zhao, G. and Zhao, J. W. and Zhao, J. Y. and Zhao, J. Z. and Zhao, Lei and Zhao, Ling and Zhao, M. G. and Zhao, Q. and Zhao, S. J. and Zhao, T. C. and Zhao, Y. B. and Zhao, Z. G. and Zhemchugov, A. and Zheng, B. and Zheng, J. P. and Zheng, W. J. and Zheng, Y. H. and Zhong, B. and Zhou, L. and Zhou, X. and Zhou, X. K. and Zhou, X. R. and Zhou, X. Y. and Zhou, Y. X. and Zhu, J. and Zhu, K. and Zhu, K. J. and Zhu, S. and Zhu, S. H. and Zhu, X. L. and Zhu, Y. C. and Zhu, Y. S. and Zhu, Z. A. and Zhuang, J. and Zotti, L. and Zou, B. S. and Zou, J. H.},

  abstractNote = {Based on 448.1 x 106 ψ(3686) events collected with the BESIII detector, the decays ψ(3686) → γχcJ,χcJ → γγ(J = 0,1,2) are studied in this paper. The decay branching fractions of χc0,2 → γγ are measured to be β(χc0 → γγ) = (1.93 ± 0.08 ± 0.05 ± 0.05) x 10-4 and β(χc2 → γγ) = (3.10 ± 0.09 ± 0.07 ± 0.11) x 10-4, which correspond to two-photon decay widths of Γγγ(χc0) = 2.03 ± 0.08 ± 0.06 ± 0.13 keV and Γγγ(χc2) = 0.60 ± 0.02 ± 0.01 ± 0.04 keV with a ratio of R = Γγγ(χc2)/Γγγ(χc0) = 0.295 ± 0.014 ± 0.007 ± 0.027, where the uncertainties are statistical, systematic and associated with the uncertainties of β(ψ(3686) → γχc0,2) and the total widths Γ(χc0,2), respectively. For the forbidden decay of χc1 → γγ, no signal is observed, and an upper limit on the two-photon width is obtained to be Γγγ(χc1) < 5.3 eV at the 90% confidence level. Finally, the ratio of the two-photon widths between helicity-zero and helicity-two components in the decay χc2 → γγ is also measured to be f0/2 = Γλ=0γγ(χc2)/Γλ=2γγ(χc2) = (0.0 ± 0.6 ± 1.2) x 10-2, where the uncertainties are statistical and systematic, respectively.},

  doi          = {10.1103/PhysRevD.96.092007},

  journal      = {Physical Review D},

  number       = 9,

  volume       = 96,

  place        = {United States},

  year         = {Tue Nov 28 00:00:00 EST 2017},

  month        = {Tue Nov 28 00:00:00 EST 2017}

}

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FIG. 1: Upper plot: The fitted $E(\gamma_{1}$) spectrum for the $\psi$(3686) data sample. The dots with error bar indicate data, the (black) solid line is the best fit result, and the (red) dashed line shows the background. The expected positions of the $\chi_{c0}, \chi_{c1}, \chi_{c2}$ are indicated by arrows. Lowermore »

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Works referenced in this record:

Properties of heavy quarkonia and $B_{c}$ mesons in the relativistic quark model
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Ebert, D.; Faustov, R. N.; Galkin, V. O.
Physical Review D, Vol. 67, Issue 1
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Evidence for $ψ'$ Decays into $γ π^{0}$ and $γ η$
journal, December 2010

Ablikim, M.; Achasov, M. N.; An, L.
Physical Review Letters, Vol. 105, Issue 26
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Two-Photon Decays of Charmonia from Lattice QCD
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Dudek, Jozef J.; Edwards, Robert G.
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The BES upgrade
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Bai, J. Z.; Bao, H. C.; Blum, I.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 458, Issue 3
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Oreglia, M.; Bloom, E.; Bulos, F.
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Godfrey, Stephen; Isgur, Nathan
Physical Review D, Vol. 32, Issue 1
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Review of Particle Physics
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Olive, K. A.
Chinese Physics C, Vol. 40, Issue 10
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Charmonium
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Voloshin, M. B.
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Two-photon widths of the $χ_{c J}$ states of charmonium
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Ecklund, K. M.; Love, W.; Savinov, V.
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Ping, Wang; Yan-Yun, Ma; Xiu-Bo, Qin
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Measurement of the integrated luminosities of the data taken by BESIII at √ s = 3.650 and 3.773 GeV
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Measurement of $B (ψ (3770) \to γ χ_{c 1})$ and search for $ψ (3770) \to γ χ_{c 2}$
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Ablikim, M.; Achasov, M. N.; Ai, X. C.
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Two-Photon Decay Rates of Heavy Quarkonia in the Relativistic Quark Model
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Measurement of the branching fraction for ψ (3770)→ γχ c0
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Physics Letters B, Vol. 753
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Higher-order multipole amplitude measurement in $ψ^{'} \to γ χ_{c 2}$
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Doncheski, M. A.; Grotch, H.; Sebastian, K. J.
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Karl, Gabriel; Meshkov, Sydney; Rosner, Jonathan L.
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Jadach, S.; Ward, B. F. L.; Wa̧s, Z.
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Meson-photon transition form factors and resonance cross-sections in e+e− collisions
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Design and construction of the BESIII detector
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Electromagnetic annihilation rates of $χ_{c 0}$ and $χ_{c 2}$ with both relativistic and QCD radiative corrections
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Huang, Han-Wen; Qiao, Cong-Feng; Chao, Kuang-Ta
Physical Review D, Vol. 54, Issue 3
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Works referencing / citing this record:

Observation of the decays $χ_{c J} \to ϕ ϕ η$
journal, January 2020

Ablikim, M.; Achasov, M. N.; Adlarson, P.
Physical Review D, Vol. 101, Issue 1
DOI: 10.1103/physrevd.101.012012

Decay and detection of a light scalar boson mixing with the Higgs boson
journal, January 2019

Winkler, Martin Wolfgang
Physical Review D, Vol. 99, Issue 1
DOI: 10.1103/physrevd.99.015018

Decay and Detection of a Light Scalar Boson Mixing with the Higgs
text, January 2018

Winkler, Martin Wolfgang
arXiv
DOI: 10.48550/arxiv.1809.01876

Figures / Tables found in this record:

Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.

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Measurement of higher-order multipole amplitudes in $ψ (3686) \to γ χ_{c 1, 2}$ with $χ_{c 1, 2} \to γ J / ψ$ and search for the transition $η_{c} (2 S) \to γ J / ψ$

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Using 106 ×10⁶ ψ (3686) events collected with the BESIII detector, we measure multipole amplitudes for the decay ψ (3686) → γχ_c1,2 → γγ J/ψ beyond the dominant electric-dipole amplitudes. The normalized magnetic-quadrupole (M2) amplitude for ψ (3686) → γχ_c1,2 → γγ J/ψ and the normalized electric-octupole amplitudes for ψ ( 3686 ) → γχ_c2, χ_c2 → γJ/ψ are determined. The M2 amplitudes for ψ (3686) → γ χ_c1 and χ_c1,2 → γ J / ψ are found to differ significantly from zero and are consistent with theoretical predictions. We also obtain the ratios of M2 contributions of ψ ( 3686 ) and J /ψ decays to χ_c1,2, bmore »« less
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Title: Improved measurements of two-photon widths of the χ c J states and helicity analysis for χ c 2 → γ γ

Abstract

Citation Formats

Figures / Tables:

Properties of heavy quarkonia and B c mesons in the relativistic quark model journal, January 2003

Evidence for ψ ′ Decays into γ π 0 and γ η journal, December 2010

Two-Photon Decays of Charmonia from Lattice QCD journal, October 2006

The BES upgrade journal, February 2001

Study of the reaction ψ ′ → γ γ J ψ journal, May 1982

Heavy Quarks and e + e − Annihilation journal, January 1975

Mesons in a relativized quark model with chromodynamics journal, July 1985

Review of Particle Physics journal, October 2016

Charmonium journal, October 2008

Two-photon widths of the χ c J states of charmonium journal, November 2008

Calculation of the annihilation rate of P wave quark-antiquark bound states journal, January 1976

The EvtGen particle decay simulation package journal, April 2001

Performance of the plugged-in 22 Na based slow positron beam facility journal, March 2008

Next-to-next-to-leading-order QCD corrections to χ c 0 , 2 → γ γ journal, December 2016

Measurement of the e+e−→π+π− cross section between 600 and 900 MeV using initial state radiation journal, February 2016

Measurement of the proton form factor by studying e + e − → p p ¯ journal, June 2015

Event generator for J / ψ and ψ ( 2 S ) decay journal, June 2000

Two-photon widths of the χ c 0 , 2 states and helicity analysis for χ c 2 → γ γ journal, June 2012

The precision Monte Carlo event generator for two-fermion final states in collisions journal, August 2000

Study of χ c J radiative decays into a vector meson journal, June 2011

Effective Lagrangian for two-photon and two-gluon decays of P -wave heavy quarkonium χ c 0 , 2 and χ b 0 , 2 states journal, May 2009

Selection Rules for the Dematerialization of a Particle into Two Photons journal, January 1950

Measurement of the integrated luminosities of the data taken by BESIII at √ s = 3.650 and 3.773 GeV journal, December 2013

Relativistic two-photon and two-gluon decay rates of heavy quarkonia journal, August 1996

Measurement of B ( ψ ( 3770 ) → γ χ c 1 ) and search for ψ ( 3770 ) → γ χ c 2 journal, May 2015

Two-Photon Decay Rates of Heavy Quarkonia in the Relativistic Quark Model journal, March 2003

The BABAYAGA event generator journal, April 2004

Quarkonia and their transitions journal, September 2008

Two-photon and two-gluon decays of p -wave heavy quarkonium using a covariant light-front approach journal, August 2010

Measurement of the χ c 2 polarization in ψ ( 2 S ) → γ χ c 2 journal, November 2004

The BES detector journal, May 1994

Trigger efficiencies at BESIII journal, December 2010

Measurement of the branching fraction for ψ (3770)→ γχ c0 journal, February 2016

Higher-order multipole amplitude measurement in ψ ′ → γ χ c 2 journal, November 2011

Quarkonia and quantum chromodynamics journal, July 1981

Geant4—a simulation toolkit journal, July 2003

Angular distribution of photons in the parity-changing one-photon radiative decays of quarkonia journal, October 1990

Symmetries, angular distributions in ψ ′ → γ χ → γ γ ψ , and the interpretation of the χ ( 3 4 0 0 − 3 5 5 0 ) levels journal, March 1976

Coherent exclusive exponentiation for precision Monte Carlo calculations journal, May 2001

Meson-photon transition form factors and resonance cross-sections in e+e− collisions journal, July 1998

Design and construction of the BESIII detector journal, March 2010

Electromagnetic annihilation rates of χ c 0 and χ c 2 with both relativistic and QCD radiative corrections journal, August 1996

Observation of the decays χ c J → ϕ ϕ η journal, January 2020

Decay and detection of a light scalar boson mixing with the Higgs boson journal, January 2019

Decay and Detection of a Light Scalar Boson Mixing with the Higgs text, January 2018

Title: Improved measurements of two-photon widths of the $χ_{c J}$ states and helicity analysis for $χ_{c 2} \to γ γ$

Properties of heavy quarkonia and $B_{c}$ mesons in the relativistic quark model
journal, January 2003

Evidence for $ψ'$ Decays into $γ π^{0}$ and $γ η$
journal, December 2010

Two-Photon Decays of Charmonia from Lattice QCD
journal, October 2006

The BES upgrade
journal, February 2001

Study of the reaction $ψ^{'} \to γ γ \frac{J}{ψ}$
journal, May 1982

Heavy Quarks and $e^{+} e^{-}$ Annihilation
journal, January 1975

Mesons in a relativized quark model with chromodynamics
journal, July 1985

Review of Particle Physics
journal, October 2016

Charmonium
journal, October 2008

Two-photon widths of the $χ_{c J}$ states of charmonium
journal, November 2008

Calculation of the annihilation rate of P wave quark-antiquark bound states
journal, January 1976

The EvtGen particle decay simulation package
journal, April 2001

Performance of the plugged-in ²² Na based slow positron beam facility
journal, March 2008

Next-to-next-to-leading-order QCD corrections to $χ_{c 0, 2} \to γ γ$
journal, December 2016

Measurement of the e+e−→π+π− cross section between 600 and 900 MeV using initial state radiation
journal, February 2016

Measurement of the proton form factor by studying $e^{+} e^{-} \to p \bar{p}$
journal, June 2015

Event generator for $J / ψ$ and $ψ (2 S)$ decay
journal, June 2000

Two-photon widths of the $χ_{c 0, 2}$ states and helicity analysis for $χ_{c 2} \to γ γ$
journal, June 2012

The precision Monte Carlo event generator for two-fermion final states in collisions
journal, August 2000

Study of $χ_{c J}$ radiative decays into a vector meson
journal, June 2011

Effective Lagrangian for two-photon and two-gluon decays of $P$ -wave heavy quarkonium $χ_{c 0, 2}$ and $χ_{b 0, 2}$ states
journal, May 2009

Selection Rules for the Dematerialization of a Particle into Two Photons
journal, January 1950

Measurement of the integrated luminosities of the data taken by BESIII at √ s = 3.650 and 3.773 GeV
journal, December 2013

Relativistic two-photon and two-gluon decay rates of heavy quarkonia
journal, August 1996

Measurement of $B (ψ (3770) \to γ χ_{c 1})$ and search for $ψ (3770) \to γ χ_{c 2}$
journal, May 2015

Two-Photon Decay Rates of Heavy Quarkonia in the Relativistic Quark Model
journal, March 2003

The BABAYAGA event generator
journal, April 2004

Quarkonia and their transitions
journal, September 2008

Two-photon and two-gluon decays of $p$ -wave heavy quarkonium using a covariant light-front approach
journal, August 2010

Measurement of the $χ_{c 2}$ polarization in $ψ (2 S) \to γ χ_{c 2}$
journal, November 2004

The BES detector
journal, May 1994

Trigger efficiencies at BESIII
journal, December 2010

Measurement of the branching fraction for ψ (3770)→ γχ c0
journal, February 2016

Higher-order multipole amplitude measurement in $ψ^{'} \to γ χ_{c 2}$
journal, November 2011

Quarkonia and quantum chromodynamics
journal, July 1981

Geant4—a simulation toolkit
journal, July 2003

Angular distribution of photons in the parity-changing one-photon radiative decays of quarkonia
journal, October 1990

Symmetries, angular distributions in $ψ^{'} \to γ χ \to γ γ ψ$ , and the interpretation of the $χ (3400 - 3550)$ levels
journal, March 1976

Coherent exclusive exponentiation for precision Monte Carlo calculations
journal, May 2001

Meson-photon transition form factors and resonance cross-sections in e+e− collisions
journal, July 1998

Design and construction of the BESIII detector
journal, March 2010

Electromagnetic annihilation rates of $χ_{c 0}$ and $χ_{c 2}$ with both relativistic and QCD radiative corrections
journal, August 1996

Observation of the decays $χ_{c J} \to ϕ ϕ η$
journal, January 2020

Decay and detection of a light scalar boson mixing with the Higgs boson
journal, January 2019

Decay and Detection of a Light Scalar Boson Mixing with the Higgs
text, January 2018