/ Experiment-HEP arXiv:1301.1476


Evidence for $\eta_{c}(2S)$ in $\psi(3686) \to \gamma K_{S}^{0}K^{\pm}\pi^{\mp}\pi^{+}\pi^{-}$


Ablikim, M. (Beijing, Inst. High Energy Phys.) ; Achasov, M.N. (Novosibirsk, IYF) ; Albayrak, O. (Carnegie Mellon U.) ; Ambrose, D.J. (Rochester U.) ; An, F.F. (Beijing, Inst. High Energy Phys.) ; An, Q. (Hefei, CUST) ; Bai, J.Z. (Beijing, Inst. High Energy Phys.) ; Ferroli, R.Baldini (Peking U.) ; Ban, Y. (Peking U.) ; Becker, J. (Ruhr U., Bochum) ; Bennett, J.V. (Indiana U.) ; Bertani, M. (Minnesota U.) ; Bian, J.M. (Minnesota U.) ; Boger, E. (Moscow, MIPT) ; Bondarenko, O. (Groningen, KVI) ; Boyko, I. (Dubna, JINR) ; Briere, R.A. (Carnegie Mellon U.) ; Bytev, V. (Dubna, JINR) ; Cai, H. (Wuhan U.) ; Cai, X. (Beijing, Inst. High Energy Phys.) ; Cakir, O. (Beijing, Inst. High Energy Phys.) ; Calcaterra, A. (Beijing, Inst. High Energy Phys.) ; Cao, G.F. (Beijing, Inst. High Energy Phys.) ; Cetin, S.A. (Beijing, Inst. High Energy Phys.) ; Chang, J.F. (Beijing, Inst. High Energy Phys.) ; Chelkov, G. (Moscow, MIPT) ; Chen, G. (Beijing, Inst. High Energy Phys.) ; Chen, H.S. (Beijing, Inst. High Energy Phys.) ; Chen, J.C. (Beijing, Inst. High Energy Phys.) ; Chen, M.L. (Beijing, Inst. High Energy Phys.) ; Chen, S.J. (Nanjing U., Dept. Astron.) ; Chen, X. (Peking U.) ; Chen, Y.B. (Beijing, Inst. High Energy Phys.) ; Cheng, H.P. (Huangshan U.) ; Chu, Y.P. (Beijing, Inst. High Energy Phys.) ; Cronin-Hennessy, D. (Minnesota U.) ; Dai, H.L. (Beijing, Inst. High Energy Phys.) ; Dai, J.P. (Beijing, Inst. High Energy Phys.) ; Dedovich, D. (Dubna, JINR) ; Deng, Z.Y. (Beijing, Inst. High Energy Phys.) ; Denig, A. (Mainz U., Inst. Phys.) ; Denysenko, I. (BITP, Kiev) ; Destefanis, M. (Shandong U.) ; Ding, W.M. (Shandong U.) ; Ding, Y. (Liaoning U.) ; Dong, L.Y. (Beijing, Inst. High Energy Phys.) ; Dong, M.Y. (Beijing, Inst. High Energy Phys.) ; Du, S.X. (Zhengzhou U.) ; Fang, J. (Beijing, Inst. High Energy Phys.) ; Fang, S.S. (Beijing, Inst. High Energy Phys.) ; Fava, L. (Hefei, CUST) ; Feng, C.Q. (Hefei, CUST) ; Friedel, P. (Ruhr U., Bochum) ; Fu, C.D. (Beijing, Inst. High Energy Phys.) ; Fu, J.L. (Nanjing U., Dept. Astron.) ; Gao, Y. (Tsinghua U., Beijing) ; Geng, C. (Hefei, CUST) ; Goetzen, K. (Darmstadt, GSI) ; Gong, W.X. (Beijing, Inst. High Energy Phys.) ; Gradl, W. (Mainz U., Inst. Phys.) ; Greco, M. (Beijing, Inst. High Energy Phys.) ; Gu, M.H. (Beijing, Inst. High Energy Phys.) ; Gu, Y.T. (Guangxi U.) ; Guan, Y.H. (Beijing, GUCAS) ; Guo, A.Q. (Nankai U.) ; Guo, L.B. (Nanjing Normal U.) ; Guo, T. (Nanjing Normal U.) ; Guo, Y.P. (Nankai U.) ; Han, Y.L. (Beijing, Inst. High Energy Phys.) ; Harris, F.A. (Hawaii U.) ; He, K.L. (Beijing, Inst. High Energy Phys.) ; He, M. (Beijing, Inst. High Energy Phys.) ; He, Z.Y. (Nankai U.) ; Held, T. (Ruhr U., Bochum) ; Heng, Y.K. (Beijing, Inst. High Energy Phys.) ; Hou, Z.L. (Beijing, Inst. High Energy Phys.) ; Hu, C. (Nanjing Normal U.) ; Hu, H.M. (Beijing, Inst. High Energy Phys.) ; Hu, J.F. (Giessen U.) ; Hu, T. (Beijing, Inst. High Energy Phys.) ; Huang, G.M. (Hua-Zhong Normal U.) ; Huang, G.S. (Hefei, CUST) ; Huang, J.S. (Henan Normal U.) ; Huang, L. (Beijing, Inst. High Energy Phys.) ; Huang, X.T. (Shandong U.) ; Huang, Y. (Nanjing U., Dept. Astron.) ; Huang, Y.P. (Beijing, Inst. High Energy Phys.) ; Hussain, T. (Punjab U., CHEP) ; Ji, C.S. (Hefei, CUST) ; Ji, Q. (Beijing, Inst. High Energy Phys.) ; Ji, Q.P. (Nankai U.) ; Ji, X.B. (Beijing, Inst. High Energy Phys.) ; Ji, X.L. (Beijing, Inst. High Energy Phys.) ; Jiang, L.L. (Beijing, Inst. High Energy Phys.) ; Jiang, X.S. (Beijing, Inst. High Energy Phys.) ; Jiao, J.B. (Shandong U.) ; Jiao, Z. (Huangshan U.) ; Jin, D.P. (Beijing, Inst. High Energy Phys.) ; Jin, S. (Beijing, Inst. High Energy Phys.) ; Jing, F.F. (Tsinghua U., Beijing) ; Kalantar-Nayestanaki, N. (Groningen, KVI) ; Kavatsyuk, M. (Groningen, KVI) ; Kopf, B. (Ruhr U., Bochum) ; Kornicer, M. (Hawaii U.) ; Kuehn, W. (Giessen U.) ; Lai, W. (Beijing, Inst. High Energy Phys.) ; Lange, J.S. (Giessen U.) ; Leyhe, M. (Ruhr U., Bochum) ; Li, C.H. (Beijing, Inst. High Energy Phys.) ; Li, Cheng (Hefei, CUST) ; Li, Cui (Hefei, CUST) ; Li, D.M. (Zhengzhou U.) ; Li, F. (Beijing, Inst. High Energy Phys.) ; Li, G. (Beijing, Inst. High Energy Phys.) ; Li, H.B. (Beijing, Inst. High Energy Phys.) ; Li, J.C. (Beijing, Inst. High Energy Phys.) ; Li, K. (Hangzhou Normal U.) ; Li, Lei (Beijing, Inst. High Energy Phys.) ; Li, Q.J. (Beijing, Inst. High Energy Phys.) ; Li, S.L. (Beijing, Inst. High Energy Phys.) ; Li, W.D. (Beijing, Inst. High Energy Phys.) ; Li, W.G. (Beijing, Inst. High Energy Phys.) ; Li, X.L. (Shandong U.) ; Li, X.N. (Beijing, Inst. High Energy Phys.) ; Li, X.Q. (Nankai U.) ; Li, X.R. (Seoul Natl. U.) ; Li, Z.B. (Zhongshan U.) ; Liang, H. (Hefei, CUST) ; Liang, Y.F. (Sichuan U., Inst. Nucl. Sci. Tech.) ; Liang, Y.T. (Giessen U.) ; Liao, G.R. (Tsinghua U., Beijing) ; Liao, X.T. (Beijing, Inst. High Energy Phys.) ; Lin, D. (Mainz U., Inst. Phys.) ; Liu, B.J. (Beijing, Inst. High Energy Phys.) ; Liu, C.L. (Carnegie Mellon U.) ; Liu, C.X. (Beijing, Inst. High Energy Phys.) ; Liu, F.H. (Shanxi U.) ; Liu, Fang (Beijing, Inst. High Energy Phys.) ; Liu, Feng (Hua-Zhong Normal U.) ; Liu, H. (Beijing, Inst. High Energy Phys.) ; Liu, H.B. (Guangxi U.) ; Liu, H.H. (Henan U.) ; Liu, H.M. (Beijing, Inst. High Energy Phys.) ; Liu, H.W. (Beijing, Inst. High Energy Phys.) ; Liu, J.P. (Wuhan U.) ; Liu, K. (Tsinghua U., Beijing) ; Liu, K.Y. (Liaoning U.) ; Liu, Kai (Beijing, GUCAS) ; Liu, P.L. (Shandong U.) ; Liu, Q. (Beijing, GUCAS) ; Liu, S.B. (Hefei, CUST) ; Liu, X. (Lanzhou U.) ; Liu, Y.B. (Nankai U.) ; Liu, Z.A. (Beijing, Inst. High Energy Phys.) ; Liu, Zhiqiang (Beijing, Inst. High Energy Phys.) ; Liu, Zhiqing (Beijing, Inst. High Energy Phys.) ; Loehner, H. (Groningen, KVI) ; Lu, G.R. (Henan Normal U.) ; Lu, H.J. (Huangshan U.) ; Lu, J.G. (Beijing, Inst. High Energy Phys.) ; Lu, Q.W. (Shanxi U.) ; Lu, X.R. (Beijing, GUCAS) ; Lu, Y.P. (Beijing, Inst. High Energy Phys.) ; Luo, C.L. (Nanjing Normal U.) ; Luo, M.X. (Zhejiang U.) ; Luo, T. (Hawaii U.) ; Luo, X.L. (Beijing, Inst. High Energy Phys.) ; Lv, M. (Beijing, Inst. High Energy Phys.) ; Ma, C.L. (Beijing, GUCAS) ; Ma, F.C. (Liaoning U.) ; Ma, H.L. (Beijing, Inst. High Energy Phys.) ; Ma, Q.M. (Beijing, Inst. High Energy Phys.) ; Ma, S. (Beijing, Inst. High Energy Phys.) ; Ma, T. (Beijing, Inst. High Energy Phys.) ; Ma, X.Y. (Beijing, Inst. High Energy Phys.) ; Maas, F.E. (Mainz U., Inst. Phys.) ; Maggiora, M. (Punjab U., CHEP) ; Malik, Q.A. (Punjab U., CHEP) ; Mao, Y.J. (Peking U.) ; Mao, Z.P. (Beijing, Inst. High Energy Phys.) ; Messchendorp, J.G. (Groningen, KVI) ; Min, J. (Beijing, Inst. High Energy Phys.) ; Min, T.J. (Beijing, Inst. High Energy Phys.) ; Mitchell, R.E. (Indiana U.) ; Mo, X.H. (Beijing, Inst. High Energy Phys.) ; Morales Morales, C. (Mainz U., Inst. Phys.) ; Muchnoi, N.Yu. (Novosibirsk, IYF) ; Muramatsu, H. (Rochester U.) ; Nefedov, Y. (Dubna, JINR) ; Nicholson, C. (Beijing, GUCAS) ; Nikolaev, I.B. (Novosibirsk, IYF) ; Ning, Z. (Beijing, Inst. High Energy Phys.) ; Olsen, S.L. (Seoul Natl. U.) ; Ouyang, Q. (Beijing, Inst. High Energy Phys.) ; Pacetti, S. (Seoul Natl. U.) ; Park, J.W. (Seoul Natl. U.) ; Pelizaeus, M. (Ruhr U., Bochum) ; Peng, H.P. (Hefei, CUST) ; Peters, K. (Darmstadt, GSI) ; Ping, J.L. (Nanjing Normal U.) ; Ping, R.G. (Beijing, Inst. High Energy Phys.) ; Poling, R. (Minnesota U.) ; Prencipe, E. (Mainz U., Inst. Phys.) ; Qi, M. (Nanjing U., Dept. Astron.) ; Qian, S. (Beijing, Inst. High Energy Phys.) ; Qiao, C.F. (Beijing, GUCAS) ; Qin, L.Q. (Shandong U.) ; Qin, X.S. (Beijing, Inst. High Energy Phys.) ; Qin, Y. (Peking U.) ; Qin, Z.H. (Beijing, Inst. High Energy Phys.) ; Qiu, J.F. (Beijing, Inst. High Energy Phys.) ; Rashid, K.H. (Punjab U., CHEP) ; Rong, G. (Beijing, Inst. High Energy Phys.) ; Ruan, X.D. (Guangxi U.) ; Sarantsev, A. (St. Petersburg, INP) ; Schaefer, B.D. (Indiana U.) ; Shao, M. (Hefei, CUST) ; Shen, C.P. (Nagoya U.) ; Shen, X.Y. (Beijing, Inst. 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(Beijing, Inst. High Energy Phys.) ; Zhu, X.L. (Tsinghua U., Beijing) ; Zhu, Y.C. (Hefei, CUST) ; Zhu, Y.M. (Nankai U.) ; Zhu, Y.S. (Beijing, Inst. High Energy Phys.) ; Zhu, Z.A. (Beijing, Inst. High Energy Phys.) ; Zhuang, J. (Beijing, Inst. High Energy Phys.) ; Zou, B.S. (Beijing, Inst. High Energy Phys.) ; Zou, J.H. (Beijing, Inst. High Energy Phys.)

Abstract: We search for the M1 radiative transition \psi(3686) \to \gamma\eta_{c}(2S) by reconstructing the exclusive \eta_{c}(2S) \to K_{S}^{0}K^{\pm}\pi^{\mp}\pi^{+}\pi^{-} decay using 1.06 \times 10^8 \psi(3686) events collected with the BESIII detector. The signal is observed with a statistical significance of greater than 4 standard deviations. The measured mass of the \eta_{c}(2S) is 3646.9 \pm 1.6(stat) \pm 3.6(syst) MeV/c^2, and the width is 9.9 \pm 4.8(stat) \pm 2.9(syst) MeV/c^2. The product branching fraction is measured to be B(\psi(3686) \to \gamma\eta_{c}(2S)) \times B(\eta_{c}(2S) \to K_{S}^{0}K^{\pm}\pi^{\mp}\pi^{+}\pi^{-}) = (7.03 \pm 2.10(stat) \pm 0.70(syst)) \times 10^{-6}. This measurement complements a previous BESIII measurement of \psi(3686) \to \gamma\eta_{c}(2S) with \eta_{c}(2S) \to K_{S}^{0} K^{\pm}\pi^{\mp} and K^{+}K^{-}\pi^{0}.

Web-Page: http://inspirehep.net/record/1209715/files/arXiv:1301.1476.pdf; http://inspirehep.net/record/1209715/files/fig1-1.png; http://inspirehep.net/record/1209715/files/fig1-2.png; http://inspirehep.net/record/1209715/files/fig2_v9.png; http://inspirehep.net/record/1209715/files/fig3.png; http://inspirehep.net/record/1209715/files/fig4-1.png; http://inspirehep.net/record/1209715/files/fig4-2.png

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