An improved limit for Γee of X(3872) and Γee measurement of ψ(3686)

Ablikim, M.; Achasov, M.N.; Ai, X.C.; Albayrak, O.; Albrecht, M.; Ambrose, D.J.; Amoroso, A.; An, F.F.; An, Q.; Bai, J.Z.; Baldini Ferroli, R.; Ban, Y.; Bennett, D.W.; Bennett, J.V.; Bertani, M.; Bettoni, D.; Bian, J.M.; Bianchi, F.; Boger, E.; Bondarenko, O.; Boyko, I.; Briere, R.A.; Cai, H.; Cai, X.; Cakir, O.; Calcaterra, A.; Cao, G.F.; Cetin, S.A.; Chang, J.F.; Chelkov, G.; Chen, G.; Chen, H.S.; Chen, H.Y.; Chen, J.C.; Chen, M.L.; Chen, S.J.; Chen, X.; Chen, X.R.; Chen, Y.B.; Cheng, H.P.; Chu, X.K.; Cibinetto, G.; Cronin-Hennessy, D.; 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.; Du, S.X.; Duan, P.F.; Fan, J.Z.; Fang, J.; Fang, S.S.; Fang, X.; Fang, Y.; Fava, L.; Feldbauer, F.; Felici, G.; Feng, C.Q.; Fioravanti, E.; Fritsch, M.; Fu, C.D.; Gao, Q.; Gao, X.Y.; Gao, Y.; Gao, Z.; Garzia, I.; Geng, C.; Goetzen, K.; Gong, W.X.; Gradl, W.; Greco, M.; Gu, M.H.; Gu, Y.T.; Guan, Y.H.; Guo, A.Q.; Guo, L.B.; Guo, Y.; Guo, Y.P.; Haddadi, Z.; Hafner, A.; Han, S.; Han, Y.L.; Hao, X.Q.; Harris, F.A.; He, K.L.; He, Z.Y.; Held, T.; Heng, Y.K.; Hou, Z.L.; Hu, C.; Hu, H.M.; Hu, J.F.; Hu, T.; Hu, Y.; Huang, G.M.; Huang, G.S.; Huang, H.P.; Huang, J.S.; Huang, X.T.; Huang, Y.; Hussain, T.; Ji, Q.; Ji, Q.P.; Ji, X.B.; Ji, X.L.; Jiang, L.L.; Jiang, L.W.; Jiang, X.S.; Jiao, J.B.; Jiao, Z.; Jin, D.P.; Jin, S.; Johansson, T.; Julin, A.; Kalantar-Nayestanaki, N.; Kang, X.L.; Kang, X.S.; Kavatsyuk, M.; Ke, B.C.; Kliemt, R.; Kloss, B.; Kolcu, O.B.; Kopf, B.; Kornicer, M.; Kühn, W.; Kupsc, A.; Lai, W.; Lange, J.S.; Lara, M.; Larin, P.; Leng, C.; Li, C.H.; Li, Cheng; Li, D.M.; Li, F.; Li, G.; Li, H.B.; Li, J.C.; Li, Jin; Li, K.; Li, K.; Li, Lei; Li, P.R.; Li, T.; Li, W.D.; Li, W.G.; Li, X.L.; Li, X.M.; 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.J.; Liu, C.X.; Liu, F.H.; Liu, Fang; Liu, Feng; Liu, H.B.; Liu, H.H.; Liu, H.H.; Liu, H.M.; Liu, J.; 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, X.X.; Liu, Y.B.; Liu, Z.A.; Liu, Zhiqiang; Liu, Zhiqing; Loehner, H.; Lou, X.C.; Lu, H.J.; Lu, J.G.; Lu, R.Q.; Lu, Y.; Lu, Y.P.; Luo, C.L.; Luo, M.X.; Luo, T.; Luo, X.L.; Lv, M.; Lyu, X.R.; Ma, F.C.; Ma, H.L.; Ma, L.L.; Ma, Q.M.; Ma, S.; Ma, T.; Ma, X.N.; Ma, X.Y.; Maas, F.E.; Maggiora, M.; Malik, Q.A.; Mao, Y.J.; Mao, Z.P.; Marcello, S.; Messchendorp, J.G.; Min, J.; Min, T.J.; Mitchell, R.E.; Mo, X.H.; Mo, Y.J.; Morales Morales, C.; Moriya, K.; Muchnoi, N.Yu.; Muramatsu, H.; Nefedov, Y.; Nerling, F.; Nikolaev, I.B.; Ning, Z.; Nisar, S.; Niu, S.L.; Niu, X.Y.; Olsen, S.L.; Ouyang, Q.; Pacetti, S.; Patteri, P.; Pelizaeus, M.; Peng, H.P.; Peters, K.; Pettersson, J.; Ping, J.L.; Ping, R.G.; Poling, R.; Pu, Y.N.; Qi, M.; Qian, S.; Qiao, C.F.; Qin, L.Q.; Qin, N.; Qin, X.S.; Qin, Y.; Qin, Z.H.; Qiu, J.F.; Rashid, K.H.; Redmer, C.F.; Ren, H.L.; Ripka, M.; Rong, G.; Ruan, X.D.; Santoro, V.; Sarantsev, A.; Savrié, M.; Schoenning, K.; Schumann, S.; Shan, W.; Shao, M.; Shen, C.P.; Shen, P.X.; Shen, X.Y.; Sheng, H.Y.; Song, W.M.; Song, X.Y.; Sosio, S.; Spataro, S.; Sun, G.X.; Sun, J.F.; Sun, S.S.; Sun, Y.J.; Sun, Y.Z.; Sun, Z.J.; Sun, Z.T.; Tang, C.J.; Tang, X.; Tapan, I.; Thorndike, E.H.; Tiemens, M.; Toth, D.; Ullrich, M.; Uman, I.; Varner, G.S.; Wang, 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, Q.J.; Wang, S.G.; Wang, W.; Wang, X.F.; Wang, Y.D.; Wang, Y.F.; Wang, Y.Q.; Wang, Z.; Wang, Z.G.; Wang, Z.H.; Wang, Z.Y.; Weber, T.; Wei, D.H.; Wei, J.B.; Weidenkaff, P.; Wen, S.P.; Wiedner, U.; Wolke, M.; Wu, L.H.; Wu, Z.; Xia, L.G.; Xia, Y.; Xiao, D.; Xiao, Z.J.; Xie, Y.G.; Xiu, Q.L.; Xu, G.F.; Xu, L.; Xu, Q.J.; Xu, Q.N.; Xu, X.P.; Yan, L.; Yan, W.B.; Yan, W.C.; Yan, Y.H.; Yang, H.X.; Yang, L.; Yang, Y.; Yang, Y.X.; Ye, H.; Ye, M.; Ye, M.H.; Yin, J.H.; Yu, B.X.; Yu, C.X.; Yu, H.W.; Yu, J.S.; Yuan, C.Z.; Yuan, W.L.; Yuan, Y.; Yuncu, A.; Zafar, A.A.; Zallo, A.; Zeng, Y.; Zhang, 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, S.H.; Zhang, X.Y.; Zhang, Y.; Zhang, Y.H.; Zhang, Y.T.; 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, Q.W.; 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, Li; Zhou, X.; Zhou, X.K.; Zhou, X.R.; Zhou, X.Y.; Zhu, K.; Zhu, K.J.; Zhu, S.; Zhu, X.L.; Zhu, Y.C.; Zhu, Y.S.; Zhu, Z.A.; Zhuang, J.; Zotti, L.; Zou, B.S.; Zou, J.H.
doi:10.1016/j.physletb.2015.08.013
An improved limit for Γee of X(3872) and Γee measurement of ψ(3686)

M. Ablikim (Institute of High Energy Physics, Beijing, 100049, People's Republic of China) ; M.N. Achasov (G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk, 630090, Russia) ; X.C. Ai (Institute of High Energy Physics, Beijing, 100049, People's Republic of China) ; O. Albayrak (Carnegie Mellon University, Pittsburgh, PA, 15213, USA) ; M. Albrecht (Bochum Ruhr-University, Bochum, D-44780, Germany) ; et al. - Show all 415 authors
Using the data sets taken at center-of-mass energies above 4 GeV by the BESIII detector at the BEPCII storage ring, we search for the reaction e+eââÎ³ISRX(3872)âÎ³ISRÏ+ÏâJ/Ï via the Initial State Radiation technique. The production of a resonance with quantum numbers JPC=1++ such as the X(3872) via single photon e+eâ annihilation is forbidden, but is allowed by a next-to-leading order box diagram. We do not observe a significant signal of X(3872) , and therefore give an upper limit for the electronic width times the branching fraction ÎeeX(3872)B(X(3872)âÏ+ÏâJ/Ï)<0.13Â eV at the 90% confidence level. This measurement improves upon existing limits by a factor of 46. Using the same final state, we also measure the electronic width of the Ï(3686) to be ÎeeÏ(3686)=2213Â±18statÂ±99sysÂ eV .
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      "title": "An improved limit for \u0393ee of X(3872) and \u0393ee measurement of \u03c8(3686)"
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      "value": "Using the data sets taken at center-of-mass energies above 4 GeV by the BESIII detector at the BEPCII storage ring, we search for the reaction e+e\u00e2\u0088\u0092\u00e2\u0086\u0092\u00ce\u00b3ISRX(3872)\u00e2\u0086\u0092\u00ce\u00b3ISR\u00cf\u0080+\u00cf\u0080\u00e2\u0088\u0092J/\u00cf\u0088 via the Initial State Radiation technique. The production of a resonance with quantum numbers JPC=1++ such as the X(3872) via single photon e+e\u00e2\u0088\u0092 annihilation is forbidden, but is allowed by a next-to-leading order box diagram. We do not observe a significant signal of X(3872) , and therefore give an upper limit for the electronic width times the branching fraction \u00ce\u0093eeX(3872)B(X(3872)\u00e2\u0086\u0092\u00cf\u0080+\u00cf\u0080\u00e2\u0088\u0092J/\u00cf\u0088)&lt;0.13\u00c2 eV at the 90% confidence level. This measurement improves upon existing limits by a factor of 46. Using the same final state, we also measure the electronic width of the \u00cf\u0088(3686) to be \u00ce\u0093ee\u00cf\u0088(3686)=2213\u00c2\u00b118stat\u00c2\u00b199sys\u00c2 eV ."
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Published on:: 08 August 2015
Publisher:: Elsevier
Published in:: Physics Letters B (2015)
DOI:: https://doi.org/10.1016/j.physletb.2015.08.013
Copyrights:: The Authors
Licence:: CC-BY-3.0
Fulltext files: