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Observation of a charged charmoniumlike structure Z_c(4020) and search for the Z_c(3900) in e+e- to pi+pi-h_c

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arxiv 1309.1896 v2 pith:J3RFJO55 submitted 2013-09-07 hep-ex hep-ph

Observation of a charged charmoniumlike structure Z_c(4020) and search for the Z_c(3900) in e+e- to pi+pi-h_c

BESIII Collaboration: M. Ablikim , M. N. Achasov , O. Albayrak , D. J. Ambrose , F. F. An , Q. An , J. Z. Bai , R. Baldini Ferroli
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Y. Ban J. Becker J. V. Bennett M. Bertani J. M. Bian E. Boger O. Bondarenko I. Boyko S. Braun R. A. Briere V. Bytev H. Cai X. Cai O. Cakir A. Calcaterra G. F. Cao S. A. Cetin J. F. Chang G. Chelkov G. Chen H. S. Chen J. C. Chen M. L. Chen S. J. Chen X. R. Chen Y. B. Chen H. P. Cheng X. K. Chu Y. P. Chu D. Cronin-Hennessy H. L. Dai J. P. Dai D. Dedovich Z. Y. Deng A. Denig I. Denysenko M. Destefanis W. M. Ding Y. Ding L. Y. Dong M. Y. Dong S. X. Du J. Fang S. S. Fang L. Fava C. Q. Feng P. Friedel C. D. Fu J. L. Fu O. Fuks Y. Gao C. Geng K. Goetzen W. X. Gong W. Gradl M. Greco M. H. Gu Y. T. Gu Y. H. Guan A. Q. Guo L. B. Guo T. Guo Y. P. Guo Y. L. Han F. A. Harris K. L. He M. He Z. Y. He T. Held Y. K. Heng Z. L. Hou C. Hu H. M. Hu J. F. Hu T. Hu G. M. Huang G. S. Huang J. S. Huang L. Huang X. T. Huang Y. Huang T. Hussain C. S. Ji Q. Ji Q. P. Ji X. B. Ji X. L. Ji L. L. Jiang X. S. Jiang J. B. Jiao Z. Jiao D. P. Jin S. Jin F. F. Jing N. Kalantar-Nayestanaki M. Kavatsyuk B. Kloss B. Kopf M. Kornicer W. Kuehn W. Lai J. S. Lange M. Lara P. Larin M. Leyhe C. H. Li Cheng Li Cui Li D. L. Li D. M. Li F. Li G. Li H. B. Li J. C. Li K. Li Lei Li N. Li P. R. Li Q. J. Li W. D. Li W. G. Li X. L. Li X. N. Li X. Q. Li X. R. Li Z. B. Li H. Liang Y. F. Liang Y. T. Liang G. R. Liao D. X. Lin B. J. Liu C. L. Liu C. X. Liu F. H. Liu Fang Liu Feng Liu H. B. Liu H. H. Liu H. M. Liu J. P. Liu K. Liu K. Y. Liu P. L. Liu Q. Liu S. B. Liu X. Liu Y. B. Liu Z. A. Liu Zhiqiang Liu Zhiqing Liu H. Loehner X. C. Lou G. R. Lu H. J. Lu J. G. Lu X. R. Lu Y. P. Lu C. L. Luo M. X. Luo T. Luo X. L. Luo M. Lv F. C. Ma H. L. Ma Q. M. Ma S. Ma T. Ma X. Y. Ma F. E. Maas M. Maggiora Q. A. Malik Y. J. Mao Z. P. Mao J. G. Messchendorp J. Min T. J. Min R. E. Mitchell X. H. Mo H. Moeini C. Morales Morales K. Moriya N. Yu. Muchnoi H. Muramatsu Y. Nefedov I. B. Nikolaev Z. Ning S. Nisa S. L. Olsen Q. Ouyang S. Pacetti J. W. Park M. Pelizaeus H. P. Peng K. Peters J. L. Ping R. G. Ping R. Poling E. Prencipe M. Qi S. Qian C. F. Qiao L. Q. Qin X. S. Qin Y. Qin Z. H. Qin J. F. Qiu K. H. Rashid C. F. Redmer M. Ripka G. Rong X. D. Ruan A. Sarantsev S. Schumann W. Shan M. Shao C. P. Shen X. Y. Shen H. Y. Sheng M. R. Shepherd W. M. Song X. Y. Song S. Spataro B. Spruck G. X. Sun J. F. Sun S. S. Sun Y. J. Sun Y. Z. Sun Z. J. Sun Z. T. Sun C. J. Tang X. Tang I. Tapan E. H. Thorndike D. Toth M. Ullrich I. Uman G. S. Varner B. 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 X. F. Wang X. L. Wang Y. D. Wang Y. F. Wang Y. Q. Wang Z. Wang Z. G. Wang Z. H. Wang Z. Y. Wang D. H. Wei J. B. Wei P. Weidenkaff Q. G. Wen S. P. Wen M. Werner U. Wiedner L. H. Wu N. Wu S. X. Wu W. Wu Z. Wu L. G. Xia Y. X Xia Z. J. Xiao Y. G. Xie Q. L. Xiu G. F. Xu Q. J. Xu Q. N. Xu X. P. Xu Z. R. Xu Z. Xue L. Yan W. B. Yan W. C Yan Y. H. Yan H. X. Yang Y. Yang Y. X. Yang Y. Z. Yang H. Ye M. Ye M. H. Ye B. X. Yu C. X. Yu H. W. Yu J. S. Yu S. P. Yu C. Z. Yuan W. L. Yuan Y. Yuan A. A. Zafar A. Zallo S. L. Zang Y. Zeng B. X. Zhang B. Y. Zhang C. Zhang C. B Zhang C. C. Zhang D. H. Zhang H. H. Zhang H. Y. Zhang J. Q. Zhang J. W. Zhang J. Y. Zhang J. Z. Zhang LiLi Zhang S. H. Zhang X. J. Zhang X. Y. Zhang Y. Zhang Y. H. Zhang Z. P. Zhang Z. Y. Zhang Zhenghao Zhang G. Zhao J. W. Zhao Lei Zhao Ling Zhao M. G. Zhao Q. Zhao S. J. Zhao T. C. Zhao X. H. Zhao Y. B. Zhao Z. G. Zhao A. Zhemchugov B. Zheng J. P. Zheng Y. H. Zheng B. Zhong L. Zhou X. Zhou X. K. Zhou X. R. Zhou K. Zhu K. J. Zhu X. L. Zhu Y. C. Zhu Y. S. Zhu Z. A. Zhu J. Zhuang B. S. Zou J. H. Zou
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classification hep-ex hep-ph
keywords energiesmasscenter-of-masscrossobservedpi-hsectionsspectrum
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We study e+e- --> 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- --> pi+pi-J/psi but with a different line shape. In the \pi^\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 \pi^\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 \pi^\pm h_c at center-of-mass energies of 4.23 and 4.26 GeV are set.

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