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  • Observation of Z_{c}(3900)^{0} in e^{+}e^{-}→π^{0}π^{0}J/ψ
    Achasov, M N; Albayrak, O; Amoroso, A; An, F F; An, Q; Bennett, J V; Bianchi, F; Cai, X; Cetin, S A; Chelkov, G; Chen, G; Chen, H S; Chen, X; Chen, X R; Dedovich, D; Dong, C; Fan, J Z; Feldbauer, F; Gao, Q; Gao, Z; Goetzen, K; Greco, M; Guo, A Q; He, K L; Hu, C; Huang, H P; Huang, Y; Hussain, T; Ji, Q P; Jiang, L L; Jiang, L W; Jiang, X Y; Jiao, J B; Ke, B C; Kiese, P; Kloss, B; Lara, M; Leng, C; Li, C; Li, Cheng; Li, F; Li, W D; Li, W G; Liu, C X; Liu, Fang; Liu, J P; Liu, J Y; Liu, P L; Liu, X; Liu, Zhiqiang; Liu, Zhiqing; Lu, Y; Luo, C L; Luo, T; Ma, L L; Ma, T; Ma, X N; Min, T J; Mo, Y J; Ning, Z; Niu, S L; Ouyang, Q; Pelizaeus, M; Qin, L Q; Qin, N; Qin, Y; Qin, Z H; Qiu, J F; Redmer, C F; Rong, G; Shan, W; Shen, C P; Sheng, H Y; Tang, C J; Uman, I; Wang, B L; Wang, S G; Weber, T; Wolke, M; Xiu, Q L; Xu, G F; Yan, L; Yang, H J; Yu, C X; Yu, H W; Yu, J S; Yuan, W L; Zallo, A; Zhang, J Z; Zhang, Y; Zhao, J W; Zhao, Q W; Zheng, B; Zheng, W J; Zhong, B; Zhou, L; Zhou, Li; Zhou, X K; Zhuang, J; Zou, B S

    Physical review letters, 2015-Sep-11, 20150911, Letnik: 115, Številka: 11
    Journal Article

    Using a data sample collected with the BESIII detector operating at the BEPCII storage ring, we observe a new neutral state Z_{c}(3900)^{0} with a significance of 10.4σ. The mass and width are measured to be 3894.8±2.3±3.2  MeV/c^{2} and 29.6±8.2±8.2  MeV, respectively, where the first error is statistical and the second systematic. The Born cross section for e^{+}e^{-}→π^{0}π^{0}J/ψ and the fraction of it attributable to π^{0}Z_{c}(3900)^{0}→π^{0}π^{0}J/ψ in the range E_{c.m.}=4.19-4.42  GeV are also determined. We interpret this state as the neutral partner of the four-quark candidate Z_{c}(3900)^{±}.

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