Based on 448.1×106 ψ(3686) events collected with the BESIII detector, the decays ψ(3686)→γχcJ,χcJ→γγ(J=0,1,2) are studied. The decay branching fractions of χc0,2→γγ are measured to be B(χc0→γγ)=(1.93±0.08±0.05±0.05)×10-4 and B(χc2→γγ)=(3.10±0.09±0.07±0.11)×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 B(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. 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=Γγγλ=0(χc2)/Γγγλ=2(χc2)=(0.0±0.6±1.2)×10-2, where the uncertainties are statistical and systematic, respectively.

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

Amoroso, A.;Bianchi, F.;Destefanis, M.;De Mori, F.;DING, Yan;Fava, L.;Greco, M.;Koch, L.;Lavezzi, L.;Li, G.;Maggiora, M.;Marcello, S.;Pellegrino, J.;Rolo, M.;Sosio, S.;Spataro, S.;Zhao, Lei;Zotti, L.;
2017

Abstract

Based on 448.1×106 ψ(3686) events collected with the BESIII detector, the decays ψ(3686)→γχcJ,χcJ→γγ(J=0,1,2) are studied. The decay branching fractions of χc0,2→γγ are measured to be B(χc0→γγ)=(1.93±0.08±0.05±0.05)×10-4 and B(χc2→γγ)=(3.10±0.09±0.07±0.11)×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 B(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. 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=Γγγλ=0(χc2)/Γγγλ=2(χc2)=(0.0±0.6±1.2)×10-2, where the uncertainties are statistical and systematic, respectively.
96
9
092007(1)
092007(11)
http://harvest.aps.org/v2/bagit/articles/10.1103/PhysRevD.96.092007/apsxml
Physics and Astronomy (miscellaneous)
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.
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