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Ai, X. C.; Albayrak, O.; Albrecht, M.; Bian, J. M.; Bianchi, F.; Boyko, I.; Briere, R. A.; Calcaterra, A.; Cao, G. F.; Cetin, S. A.; Chen, S. J.; Deng, Z. Y.; Dou, Z. L.; Fang, X.; Fang, Y.; Fava, L.; Fedorov, O.; Fioravanti, E.; Fu, C. D.; Gao, Q.; Guan, Y. H.; Guo, R. P.; Guo, Y.; Hafner, A.; Hu, H. M.; Hu, T.; Huang, J. S.; Ji, Q. P.; Ji, X. B.; Kang, X. L.; Lange, J. S.; Larin, P.; Li, H. J.; Li, W. D.; Li, W. G.; Li, X. M.; Liao, G. R.; Liu, B.; Liu, C. X.; Liu, H. B.; Liu, J.; Liu, J. Y.; Liu, K. Y.; Liu, P. L.; Lu, H. J.; Luo, T.; Ma, Y. M.; Mao, Y. J.; Nefedov, Y.; Nisar, S.; Patteri, P.; Pelizaeus, M.; Poling, R.; Prasad, V.; Qin, N.; Rashid, K. H.; Schumann, S.; Sheng, H. Y.; Song, W. M.; Song, X. Y.; Spataro, S.; Sun, X. H.; Sun, Y. J.; Sun, Z. J.; Varner, G. S.; Wang, M.; Wang, S. G.; Wang, Y.; Wang, Z.; Weber, T.; Wei, D. H.; Xia, L. G.; Xiao, H.; Xiu, Q. L.; Xu, Q. N.; Xu, X. P.; Yan, L.; Yan, W. B.; Yang, H. X.; Yang, L.; Yuan, Y.; Zafar, A. A.; Zeng, Z.; Zhang, B. Y.; Zhang, H. Y.; Zhang, J.; Zhang, J. L.; Zhang, J. Y.; Zhang, L.; Zhang, Y. T.; Zhang, Z. P.; Zhao, Lei; Zhemchugov, A.; Zheng, J. P.; Zheng, W. J.; Zhu, K.; Zhu, Y. S.; Zhuang, J.; Zotti, L.; Zou, J. H.
Physical review letters, 08/2017, Volume: 119, Issue: 7Journal Article
In this paper, the spin and parity of the Zc(3900)± state are determined to be JP = 1+ with a statistical significance larger than 7σ over other quantum numbers in a partial wave analysis of the process e+e- → π+π-J/Ψ. We use a data sample of 1.92 fb-1 accumulated at $ \sqrt{s}=4.23 $ and 4.26 GeV with the BESIII experiment. When parametrizing the Zc(3900)± with a Flatté-like formula, we determine its pole mass Mpole = (3881.2±4.2stat ±52.7syst) MeV/c2 and pole width Γpole = (51.8± 4.6stat ± 36.0syst) MeV. Finally, we also measure cross sections for the process e+e- → Zc(3900)+π- + c.c. → J/Ψπ+π- and determine an upper limit at the 90% confidence level for the process e+e- → Zc(4020)+π- + c.c. → J/Ψ π+π-.
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