/ Experiment-HEP arXiv:1012.3510


Confirmation of the $X(1835)$ and observation of the resonances $X(2120)$ and $X(2370)$ in $J/\psi\to \gamma \pi^+\pi^-\eta^\prime$


Ablikim, M. (Beijing, Inst. High Energy Phys.) ; Achasov, M.N. (Novosibirsk, IYF) ; An, L. (Guangxi U.) ; An, Q. (Hefei, CUST) ; An, Z.H. (Beijing, Inst. High Energy Phys.) ; Bai, J.Z. (Beijing, Inst. High Energy Phys.) ; Baldini, R. (Frascati) ; Ban, Y. (Peking U.) ; Becker, J. (Ruhr U., Bochum) ; Berger, N. (Beijing, Inst. High Energy Phys.) ; Bertani, M. (Frascati) ; Bian, J.M. (Beijing, Inst. High Energy Phys.) ; Boyko, I. (Dubna, JINR) ; Briere, R.A. (Carnegie Mellon U.) ; Bytev, V. (Dubna, JINR) ; Cai, X. (Beijing, Inst. High Energy Phys.) ; Cao, G.F. (Beijing, Inst. High Energy Phys.) ; Cao, X.X. (Beijing, Inst. High Energy Phys.) ; Chang, J.F. (Beijing, Inst. High Energy Phys.) ; Chelkov, G. (Dubna, JINR) ; 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.) ; Chen, Y. (Beijing, Inst. High Energy Phys.) ; 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.) ; Denysenko, I. (Dubna, JINR) ; Destefanis, M. (INFN, Turin) ; 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.) ; Duan, M.Y. (Shanxi U.) ; Fan, R.R. (Beijing, Inst. High Energy Phys.) ; Fang, J. (Beijing, Inst. High Energy Phys.) ; Fang, S.S. (Beijing, Inst. High Energy Phys.) ; Feldbauer, F. (Ruhr U., Bochum) ; Feng, C.Q. (Hefei, CUST) ; Fu, C.D. (Beijing, Inst. High Energy Phys.) ; Fu, J.L. (Nanjing U.) ; Gao, Y. (Tsinghua U., Beijing) ; Geng, C. (Hefei, CUST) ; Goetzen, K. (Darmstadt, GSI) ; Gong, W.X. (Beijing, Inst. High Energy Phys.) ; Greco, M. (INFN, Turin) ; Grishin, S. (Dubna, JINR) ; 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, Y.P. (Nankai U.) ; Hao, X.Q. (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.) ; Heng, Y.K. (Beijing, Inst. High Energy Phys.) ; Hou, Z.L. (Beijing, Inst. High Energy Phys.) ; Hu, H.M. (Beijing, Inst. High Energy Phys.) ; Hu, J.F. (Beijing, GUCAS) ; Hu, T. (Beijing, Inst. High Energy Phys.) ; Huang, B. (Beijing, Inst. High Energy Phys.) ; Huang, G.M. (Hua-Zhong Normal U.) ; Huang, J.S. (Henan Normal U.) ; Huang, X.T. (Shandong U.) ; Huang, Y.P. (Beijing, Inst. High Energy Phys.) ; Hussain, T. (Punjab U.) ; Ji, C.S. (Hefei, CUST) ; Ji, Q. (Beijing, Inst. High Energy Phys.) ; Ji, X.B. (Beijing, Inst. High Energy Phys.) ; Ji, X.L. (Beijing, Inst. High Energy Phys.) ; Jia, L.K. (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) ; Kavatsyuk, M. (Groningen U.) ; Komamiya, S. (Tokyo U.) ; Kuehn, W. (Giessen U.) ; Lange, J.S. (Giessen U.) ; Leung, J.K.C. (Hong Kong U.) ; 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, Lei (Beijing, Inst. High Energy Phys.) ; Li, N.B. (Nanjing Normal U.) ; Li, Q.J. (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. (Beijing, Inst. High Energy Phys.) ; Li, Z.B. (Zhongshan U.) ; Liang, H. (Hefei, CUST) ; Liang, Y.F. (Sichuan U.) ; Liang, Y.T. (Giessen U.) ; Liao, G.R (Guangxi Normal U.) ; Liao, X.T. (Beijing, Inst. High Energy Phys.) ; Liu, B.J. (Hong Kong, Chinese U.) ; Liu, B.J. (Hong Kong U.) ; Liu, C.L. (Carnegie Mellon U.) ; Liu, C.X. (Beijing, Inst. High Energy Phys.) ; Liu, C.Y. (Beijing, Inst. High Energy Phys.) ; Liu, F.H. (Shanxi U.) ; Liu, Fang (Beijing, Inst. High Energy Phys.) ; Liu, Feng (Hua-Zhong Normal U.) ; Liu, G.C. (Beijing, Inst. High Energy Phys.) ; Liu, H. (Beijing, Inst. High Energy Phys.) ; Liu, H.B. (Beijing, GUCAS) ; Liu, H.M. (Beijing, Inst. High Energy Phys.) ; Liu, H.W. (Beijing, Inst. High Energy Phys.) ; Liu, J.P. (Wuhan U.) ; Liu, K. (Peking U.) ; Liu, K.Y. (Liaoning U.) ; Liu, Q. (Hawaii U.) ; Liu, S.B. (Hefei, CUST) ; Liu, X. (Lanzhou U.) ; Liu, X.H. (Beijing, Inst. High Energy Phys.) ; Liu, Y.B. (Nankai U.) ; Liu, Y.W. (Hefei, CUST) ; Liu, Yong (Beijing, Inst. High Energy Phys.) ; Liu, Z.A. (Beijing, Inst. High Energy Phys.) ; Liu, Z.Q. (Beijing, Inst. High Energy Phys.) ; Loehner, H. (Groningen U.) ; 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. (Beijing, Inst. High Energy Phys.) ; Luo, X.L. (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, T. (Beijing, Inst. High Energy Phys.) ; Ma, X. (Beijing, Inst. High Energy Phys.) ; Ma, X.Y. (Beijing, Inst. High Energy Phys.) ; Maggiora, M. (INFN, Turin) ; Malik, Q.A. (Punjab U.) ; Mao, H. (Beijing, Inst. High Energy Phys.) ; Mao, Y.J. (Peking U.) ; Mao, Z.P. (Beijing, Inst. High Energy Phys.) ; Messchendorp, J.G. (Groningen U.) ; Min, J. (Beijing, Inst. High Energy Phys.) ; Mitchell, R.E. (Indiana U.) ; Mo, X.H. (Beijing, Inst. High Energy Phys.) ; Motzko, C. (Ruhr U., Bochum) ; Muchnoi, N.Yu. (Novosibirsk, IYF) ; Nefedov, Y. (Dubna, JINR) ; Ning, Z. (Beijing, Inst. High Energy Phys.) ; Olsen, S.L. (Seoul Natl. U.) ; Ouyang, Q. (Beijing, Inst. High Energy Phys.) ; Pacetti, S. (Frascati) ; Pelizaeus, M. (Hawaii U.) ; Peters, K. (Darmstadt, GSI) ; Ping, J.L. (Nanjing Normal U.) ; Ping, R.G. (Beijing, Inst. High Energy Phys.) ; Poling, R. (Minnesota U.) ; Pun, C.S.J. (Hong Kong U.) ; Qi, M. (Nanjing U.) ; Qian, S. (Beijing, Inst. High Energy Phys.) ; Qiao, C.F. (Beijing, GUCAS) ; Qin, X.S. (Beijing, Inst. High Energy Phys.) ; Qiu, J.F. (Beijing, Inst. High Energy Phys.) ; Rashid, K.H. (Punjab U.) ; Rong, G. (Beijing, Inst. High Energy Phys.) ; Ruan, X.D. (Guangxi U.) ; Sarantsev, A. (Dubna, JINR) ; Schulze, J. (Ruhr U., Bochum) ; Shao, M. (Hefei, CUST) ; Shen, C.P. (Hawaii U.) ; Shen, X.Y. (Beijing, Inst. High Energy Phys.) ; Sheng, H.Y. (Beijing, Inst. High Energy Phys.) ; Shepherd, M.R. (Indiana U.) ; Song, X.Y. (Beijing, Inst. High Energy Phys.) ; Sonoda, S. (Tokyo U.) ; Spataro, S. (INFN, Turin) ; Spruck, B. (Giessen U.) ; Sun, D.H. (Beijing, Inst. High Energy Phys.) ; Sun, G.X. (Beijing, Inst. High Energy Phys.) ; Sun, J.F. (Henan Normal U.) ; Sun, S.S. (Beijing, Inst. High Energy Phys.) ; Sun, X.D. (Beijing, Inst. High Energy Phys.) ; Sun, Y.J. (Hefei, CUST) ; Sun, Y.Z. (Beijing, Inst. High Energy Phys.) ; Sun, Z.J. (Beijing, Inst. High Energy Phys.) ; Sun, Z.T. (Hefei, CUST) ; Tang, C.J. (Sichuan U.) ; Tang, X. (Beijing, Inst. High Energy Phys.) ; Tang, X.F. (Guangxi Normal U.) ; Tian, H.L. (Beijing, Inst. High Energy Phys.) ; Toth, D. (Minnesota U.) ; Varner, G.S. (Hawaii U.) ; Wan, X. (Beijing, Inst. High Energy Phys.) ; Wang, B.Q. (Peking U.) ; Wang, K. (Beijing, Inst. 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(Beijing, Inst. High Energy Phys.) ; Xu, Y. (Nankai U.) ; Xu, Z.R. (Hefei, CUST) ; Xu, Z.Z. (Hefei, CUST) ; Xue, Z. (Beijing, Inst. High Energy Phys.) ; Yan, L. (Hefei, CUST) ; Yan, W.B. (Hefei, CUST) ; Yan, Y.H. (Hunan U.) ; Yang, H.X. (Beijing, Inst. High Energy Phys.) ; Yang, M. (Beijing, Inst. High Energy Phys.) ; Yang, T. (Guangxi U.) ; Yang, Y. (Hua-Zhong Normal U.) ; Yang, Y.X. (Guangxi Normal U.) ; Ye, M. (Beijing, Inst. High Energy Phys.) ; Ye, M.H. (CCAST World Lab, Beijing) ; Yu, B.X. (Beijing, Inst. High Energy Phys.) ; Yu, C.X. (Nankai U.) ; Yu, L. (Hua-Zhong Normal U.) ; Yuan, C.Z. (Beijing, Inst. High Energy Phys.) ; Yuan, W.L. (Nanjing Normal U.) ; Yuan, Y. (Beijing, Inst. High Energy Phys.) ; Zafar, A.A. (Punjab U.) ; Zallo, A. (Frascati) ; Zeng, Y. (Hunan U.) ; Zhang, B.X. (Beijing, Inst. High Energy Phys.) ; Zhang, B.Y. (Beijing, Inst. High Energy Phys.) ; Zhang, C.C. (Beijing, Inst. High Energy Phys.) ; Zhang, D.H. (Beijing, Inst. High Energy Phys.) ; Zhang, H.H. 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(Nanjing U.) ; Zhao, Y.B. (Beijing, Inst. High Energy Phys.) ; Zhao, Z.G. (Hefei, CUST) ; Zhao, Z.L. (Guangxi U.) ; Zhemchugov, A. (Dubna, JINR) ; Zheng, B. (Beijing, Inst. High Energy Phys.) ; Zheng, J.P. (Beijing, Inst. High Energy Phys.) ; Zheng, Y.H. (Beijing, GUCAS) ; Zheng, Z.P. (Beijing, Inst. High Energy Phys.) ; Zhong, B. (Beijing, Inst. High Energy Phys.) ; Zhong, J. (Ruhr U., Bochum) ; Zhong, L. (Tsinghua U., Beijing) ; Zhou, L. (Beijing, Inst. High Energy Phys.) ; Zhou, X.K. (Beijing, GUCAS) ; Zhou, X.R. (Hefei, CUST) ; Zhu, C. (Beijing, Inst. High Energy Phys.) ; Zhu, K. (Beijing, Inst. High Energy Phys.) ; Zhu, K.J. (Beijing, Inst. High Energy Phys.) ; Zhu, S.H. (Beijing, Inst. High Energy Phys.) ; Zhu, X.L. (Tsinghua U., Beijing) ; Zhu, X.W. (Beijing, Inst. High Energy Phys.) ; 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. 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Published in: Phys.Rev.Lett.
Year: 2011
Vol.: 106
Page No: 072002

Abstract: With a sample of (225.2\pm2.8)*10^{6} J/psi events registered in the BESIII detector, J/psi->gamma pi^+ pi^- eta' is studied using two eta' decay modes: eta'->pi^+ pi^- eta and eta' -> gamma rho^0. The X(1835), which was previously observed by BESII, is confirmed with a statistical significance that is larger than 20\sigma. In addition, in the pi^+pi^-eta' invariant mass spectrum, the X(2120) and the X(2370), are observed with statistical significances larger than 7.2\sigma and 6.4\sigma, respectively. For the X(1835), the angular distribution of the radiative photon is consistent with expectations for a pseudoscalar.

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