Observation of a charged charmoniumlike structure Z_c(4020) and search for the Z_c(3900) in e+e- to pi+pi-h_c
Creators: name: BESIII Collaboration
name: Ablikim, M.
name: Achasov, M. N.
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: Braun, S.
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. R.
name: Chen, Y. B.
name: Cheng, H. P.
name: Chu, X. K.
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, 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: 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: Kloss, B.
name: Kopf, B.
name: Kornicer, M.
name: Kuehn, 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. L.
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, N.
name: Li, P. R.
name: Li, Q. J.
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: Lin, D. X.
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. B.
name: Liu, H. H.
name: Liu, H. M.
name: Liu, J. P.
name: Liu, K.
name: Liu, K. Y.
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, 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, 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: Moeini, H.
name: Morales, C. Morales
name: Moriya, K.
name: Muchnoi, N. Yu.
name: Muramatsu, H.
name: Nefedov, Y.
name: Nikolaev, I. B.
name: Ning, Z.
name: Nisa, S.
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: Redmer, C. F.
name: Ripka, M.
name: Rong, G.
name: Ruan, X. D.
name: Sarantsev, A.
name: Schumann, S.
name: Shan, W.
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, 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.
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. H.
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, Q. J.
name: Xu, Q. N.
name: Xu, X. P.
name: Xu, Z. R.
name: Xue, Z.
name: Yan, L.
name: Yan, W. B.
name: Yan, W. C
name: Yan, Y. H.
name: Yang, H. X.
name: Yang, Y.
name: Yang, Y. X.
name: Yang, Y. Z.
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, W. L.
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. B
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, 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, J. W.
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, K.
name: Zhu, K. J.
name: Zhu, X. L.
name: Zhu, Y. C.
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 e+e- --&gt; pi+pi-h_c at center-of-mass energies from 3.90 GeV to 4.42 GeV using data samples collected with the BESIII detector operating at the Beijing Electron Positron Collider. The Born cross sections are measured at 13 energies, and are found to be of the same order of magnitude as those of e+e- --&gt; pi+pi-J/psi but with a different line shape. In the π^\pm h_c mass spectrum, a distinct structure, referred to as Z_c(4020), is observed at 4.02 GeV/c^2. The Z_c(4020) carries an electric charge and couples to charmonium. A fit to the π^\pm h_c invariant mass spectrum, neglecting possible interferences, results in a mass of (4022.9\pm 0.8\pm 2.7) MeV/c^2 and a width of (7.9\pm 2.7\pm 2.6) MeV for the Z_c(4020), where the first errors are statistical and the second systematic. No significant Z_c(3900) signal is observed, and upper limits on the Z_c(3900) production cross sections in π^\pm h_c at center-of-mass energies of 4.23 and 4.26 GeV are set.
description: A short version published in Phys. Rev. Lett. (version 1 is longer and has more plots and numbers)