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Ablikim, M; Albayrak, O; An, F F; An, Q; Bennett, J V; Bianchi, F; Cai, X; Chelkov, G; Chen, G; Chen, H S; Chen, X R; Chen, Y B; Dbeyssi, A; Ding, Y; Dong, C; Fava, L; Felici, G; Feng, C Q; Fioravanti, E; Fu, C D; Gao, Y; Hafner, A; Han, S; Hao, X Q; Huang, G S; Huang, J S; Huang, X Z; Huang, Y; Jiang, L W; Jin, S; Julin, A; Kang, X L; Lange, J S; Leng, C; Li, F Y; Li, G; Li, K; Li, Lei; Li, W G; Li, X M; Li, X N; Li, Y B; Liang, H; Lin, D X; Liu, B J; Liu, F H; Liu, Q; Ma, H L; Ma, M M; Mao, Y J; Min, J; Muramatsu, H; Pan, Y; Poling, R; Prasad, V; Qin, X S; Redmer, C F; Shao, M; Shen, P X; Sun, S S; Sun, Y Z; Sun, Z T; Wang, B; Wang, D Y; Wang, L S; Wang, W P; Wang, Y D; Wang, Y F; Wang, Y Q; Wang, Z G; Wang, Z H; Wang, Z Y; Wei, J B; Wu, L H; Wu, L J; Xia, L G; Xiao, D; Xiao, H; Xiu, Q L; Xu, J J; Yan, W B; Yan, W C; Yang, H X; Yang, L; Yang, Y X; Zhang, H Y; Zhang, L; Zhang, Y; Zhang, Y H; Zhang, Z H; Zhao, Ling; Zhao, M G; Zhao, S J; Zhao, Y B; Zheng, J P; Zheng, W J; Zhong, B; Zhou, L; Zhu, S; Zou, B S
Physical review letters, 2017-Aug-18, Letnik: 119, Številka: 7Journal Article
The spin and parity of the Z_{c}(3900)^{±} state are determined to be J^{P}=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 sqrts=4.23 and 4.26 GeV with the BESIII experiment. When parametrizing the Z_{c}(3900)^{±} with a Flatté-like formula, we determine its pole mass M_{pole}=(3881.2±4.2_{stat}±52.7_{syst}) MeV/c^{2} and pole width Γ_{pole}=(51.8±4.6_{stat}±36.0_{syst}) MeV. We also measure cross sections for the process e^{+}e^{-}→Z_{c}(3900)^{+}π^{-}+c.c.→J/ψπ^{+}π^{-} and determine an upper limit at the 90% confidence level for the process e^{+}e^{-}→Z_{c}(4020)^{+}π^{-}+c.c.→J/ψπ^{+}π^{-}.
