Measurement of the branching fraction for ψ(3770)→γχ0

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

Physics Letters B（2016）

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摘要

By analyzing a data set of 2.92 fb−1 of e+e− collision data taken at s√=3.773 GeV and 106.41×106 ψ(3686) decays taken at s√=3.686 GeV with the BESIII detector at the BEPCII collider, we measure the branching fraction and the partial decay width for ψ(3770)→γχc0 to be B(ψ(3770)→γχc0)=(6.88±0.28±0.67)×10−3 and Γ[ψ(3770)→γχc0]=(187±8±19) keV, respectively. These are the most precise measurements to date.

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