Observation of a charged charmoniumlike structure in e+e- to pi+pi-J/psi at \sqrt{s}=4.26 GeV
Creators: name: BESIII Collaboration
name: Ablikim, M.
name: Achasov, M. N.
name: Ai, X. C.
name: Albayrak, O.
name: Ambrose, D. J.
name: An, F. F.
name: An, Q.
name: Bai, J. Z.
name: Ferroli, R. Baldini
name: Ban, Y.
name: Becker, J.
name: Bennett, J. V.
name: Bertani, M.
name: Bian, J. M.
name: Boger, E.
name: Bondarenko, O.
name: Boyko, I.
name: Briere, R. A.
name: Bytev, V.
name: Cai, H.
name: Cai, X.
name: Cakir, O.
name: Calcaterra, A.
name: Cao, G. F.
name: Cetin, S. A.
name: Chang, J. F.
name: Chelkov, G.
name: Chen, G.
name: Chen, H. S.
name: Chen, J. C.
name: Chen, M. L.
name: Chen, S. J.
name: Chen, X.
name: Chen, Y. B.
name: Cheng, H. P.
name: Chu, Y. P.
name: Cronin-Hennessy, D.
name: Dai, H. L.
name: Dai, J. P.
name: Dedovich, D.
name: Deng, Z. Y.
name: Denig, A.
name: Denysenko, I.
name: Destefanis, M.
name: Ding, W. M.
name: Ding, Y.
name: Dong, L. Y.
name: Dong, M. Y.
name: Du, S. X.
name: Fang, J.
name: Fang, S. S.
name: Fava, L.
name: Feng, C. Q.
name: Friedel, P.
name: Fu, C. D.
name: Fu, J. L.
name: Fuks, O.
name: Gao, Q.
name: Gao, Y.
name: Geng, C.
name: Goetzen, K.
name: Gong, W. X.
name: Gradl, W.
name: Greco, M.
name: Gu, M. H.
name: Gu, Y. T.
name: Guan, Y. H.
name: Guo, A. Q.
name: Guo, L. B.
name: Guo, T.
name: Guo, Y. P.
name: Han, Y. L.
name: Harris, F. A.
name: He, K. L.
name: He, M.
name: He, Z. Y.
name: Held, T.
name: Heng, Y. K.
name: Hou, Z. L.
name: Hu, C.
name: Hu, H. M.
name: Hu, J. F.
name: Hu, T.
name: Huang, G. M.
name: Huang, G. S.
name: Huang, J. S.
name: Huang, L.
name: Huang, X. T.
name: Huang, Y.
name: Huang, Y. P.
name: Hussain, T.
name: Ji, C. S.
name: Ji, Q.
name: Ji, Q. P.
name: Ji, X. B.
name: Ji, X. L.
name: Jiang, L. L.
name: Jiang, X. S.
name: Jiao, J. B.
name: Jiao, Z.
name: Jin, D. P.
name: Jin, S.
name: Jing, F. F.
name: Kalantar-Nayestanaki, N.
name: Kavatsyuk, M.
name: Kopf, B.
name: Kornicer, M.
name: Kühn, W.
name: Lai, W.
name: Lange, J. S.
name: Lara, M.
name: Larin, P.
name: Leyhe, M.
name: Li, C. H.
name: Li, Cheng
name: Li, Cui
name: Li, D. M.
name: Li, F.
name: Li, G.
name: Li, H. B.
name: Li, J. C.
name: Li, K.
name: Li, Lei
name: Li, Q. J.
name: Li, S. L.
name: Li, W. D.
name: Li, W. G.
name: Li, X. L.
name: Li, X. N.
name: Li, X. Q.
name: Li, X. R.
name: Li, Z. B.
name: Liang, H.
name: Liang, Y. F.
name: Liang, Y. T.
name: Liao, G. R.
name: Liao, X. T.
name: Lin, D.
name: Liu, B. J.
name: Liu, C. L.
name: Liu, C. X.
name: Liu, F. H.
name: Liu, Fang
name: Liu, Feng
name: Liu, H.
name: Liu, H. B.
name: Liu, H. H.
name: Liu, H. M.
name: Liu, H. W.
name: Liu, J. P.
name: Liu, K.
name: Liu, K. Y.
name: Liu, Kai
name: Liu, P. L.
name: Liu, Q.
name: Liu, S. B.
name: Liu, X.
name: Liu, Y. B.
name: Liu, Z. A.
name: Liu, Zhiqiang
name: Liu, Zhiqing
name: Loehner, H.
name: Lou, X. C.
name: Lu, G. R.
name: Lu, H. J.
name: Lu, J. G.
name: Lu, Q. W.
name: Lu, X. R.
name: Lu, Y. P.
name: Luo, C. L.
name: Luo, M. X.
name: Luo, T.
name: Luo, X. L.
name: Lv, M.
name: Ma, C. L.
name: Ma, F. C.
name: Ma, H. L.
name: Ma, Q. M.
name: Ma, S.
name: Ma, T.
name: Ma, X. Y.
name: Maas, F. E.
name: Maggiora, M.
name: Malik, Q. A.
name: Mao, Y. J.
name: Mao, Z. P.
name: Messchendorp, J. G.
name: Min, J.
name: Min, T. J.
name: Mitchell, R. E.
name: Mo, X. H.
name: Mo, Y. J.
name: Moeini, H.
name: Morales, C. Morales
name: Moriya, K.
name: Muchnoi, N. Yu.
name: Muramatsu, H.
name: Nefedov, Y.
name: Nicholson, C.
name: Nikolaev, I. B.
name: Ning, Z.
name: Olsen, S. L.
name: Ouyang, Q.
name: Pacetti, S.
name: Park, J. W.
name: Pelizaeus, M.
name: Peng, H. P.
name: Peters, K.
name: Ping, J. L.
name: Ping, R. G.
name: Poling, R.
name: Prencipe, E.
name: Qi, M.
name: Qian, S.
name: Qiao, C. F.
name: Qin, L. Q.
name: Qin, X. S.
name: Qin, Y.
name: Qin, Z. H.
name: Qiu, J. F.
name: Rashid, K. H.
name: Rong, G.
name: Ruan, X. D.
name: Sarantsev, A.
name: Schaefer, B. D.
name: Shao, M.
name: Shen, C. P.
name: Shen, X. Y.
name: Sheng, H. Y.
name: Shepherd, M. R.
name: Song, W. M.
name: Song, X. Y.
name: Spataro, S.
name: Spruck, B.
name: Sun, D. H.
name: Sun, G. X.
name: Sun, J. F.
name: Sun, S. S.
name: Sun, Y. J.
name: Sun, Y. Z.
name: Sun, Z. J.
name: Sun, Z. T.
name: Tang, C. J.
name: Tang, X.
name: Tapan, I.
name: Thorndike, E. H.
name: Toth, D.
name: Ullrich, M.
name: Uman, I.
name: Varner, G. S.
name: Wang, B. Q.
name: Wang, D.
name: Wang, D. Y.
name: Wang, K.
name: Wang, L. L.
name: Wang, L. S.
name: Wang, M.
name: Wang, P.
name: Wang, P. L.
name: Wang, Q. J.
name: Wang, S. G.
name: Wang, X. F.
name: Wang, X. L.
name: Wang, Y. D.
name: Wang, Y. F.
name: Wang, Y. Q.
name: Wang, Z.
name: Wang, Z. G.
name: Wang, Z. Y.
name: Wei, D. H.
name: Wei, J. B.
name: Weidenkaff, P.
name: Wen, Q. G.
name: Wen, S. P.
name: Werner, M.
name: Wiedner, U.
name: Wu, L. H.
name: Wu, N.
name: Wu, S. X.
name: Wu, W.
name: Wu, Z.
name: Xia, L. G.
name: Xia, Y. X
name: Xiao, Z. J.
name: Xie, Y. G.
name: Xiu, Q. L.
name: Xu, G. F.
name: Xu, G. M.
name: Xu, Q. J.
name: Xu, Q. N.
name: Xu, X. P.
name: Xu, Z. R.
name: Xue, F.
name: Xue, Z.
name: Yan, L.
name: Yan, W. B.
name: Yan, Y. H.
name: Yang, H. X.
name: Yang, Y.
name: Yang, Y. X.
name: Ye, H.
name: Ye, M.
name: Ye, M. H.
name: Yu, B. X.
name: Yu, C. X.
name: Yu, H. W.
name: Yu, J. S.
name: Yu, S. P.
name: Yuan, C. Z.
name: Yuan, Y.
name: Zafar, A. A.
name: Zallo, A.
name: Zang, S. L.
name: Zeng, Y.
name: Zhang, B. X.
name: Zhang, B. Y.
name: Zhang, C.
name: Zhang, C. C.
name: Zhang, D. H.
name: Zhang, H. H.
name: Zhang, H. Y.
name: Zhang, J. Q.
name: Zhang, J. W.
name: Zhang, J. Y.
name: Zhang, J. Z.
name: Zhang, LiLi
name: Zhang, R.
name: Zhang, S. H.
name: Zhang, X. J.
name: Zhang, X. Y.
name: Zhang, Y.
name: Zhang, Y. H.
name: Zhang, Z. P.
name: Zhang, Z. Y.
name: Zhang, Zhenghao
name: Zhao, G.
name: Zhao, H. S.
name: Zhao, J. W.
name: Zhao, K. X.
name: Zhao, Lei
name: Zhao, Ling
name: Zhao, M. G.
name: Zhao, Q.
name: Zhao, S. J.
name: Zhao, T. C.
name: Zhao, X. H.
name: Zhao, Y. B.
name: Zhao, Z. G.
name: Zhemchugov, A.
name: Zheng, B.
name: Zheng, J. P.
name: Zheng, Y. H.
name: Zhong, B.
name: Zhou, L.
name: Zhou, X.
name: Zhou, X. K.
name: Zhou, X. R.
name: Zhu, C.
name: Zhu, K.
name: Zhu, K. J.
name: Zhu, S. H.
name: Zhu, X. L.
name: Zhu, Y. C.
name: Zhu, Y. M.
name: Zhu, Y. S.
name: Zhu, Z. A.
name: Zhuang, J.
name: Zou, B. S.
name: Zou, J. H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We study the process e+e- to pi+pi-J/psi at a center-of-mass energy of 4.260 GeV using a 525 pb^{-1} data sample collected with the BESIII detector operating at the Beijing Electron Positron Collider. The Born cross section is measured to be (62.9\pm 1.9\pm 3.7) pb, consistent with the production of the Y(4260). We observe a structure at around 3.9 GeV/c^2 in the π^\pm J/psi mass spectrum, which we refer to as the Z_c(3900). If interpreted as a new particle, it is unusual in that it carries an electric charge and couples to charmonium. A fit to the π^\pm J/psi invariant mass spectrum, neglecting interference, results in a mass of (3899.0\pm 3.6\pm 4.9) MeV/c^2 and a width of (46\pm 10\pm 20) MeV. Its production ratio is measured to be R=\frac{σ(e+e- to π^\pm Z_c(3900)^\mp to pi+pi-J/psi))} {σ(e+e- to pi+pi-J/psi)}=(21.5\pm 3.3\pm 7.5)%. In all measurements the first errors are statistical and the second are systematic.
description: 7 pages, 4 figures. Version appears in PRL