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Achasov, M N; Albayrak, O; Ambrose, D J; An, Q; Bertani, M; Boyko, I; Cetin, S A; Chang, J F; Chen, Y B; Chu, X K; Chu, Y P; Cronin-Hennessy, D; Dai, H L; Denig, A; Denysenko, I; Ding, W M; Fu, J L; Geng, C; Goetzen, K; Gong, W X; Greco, M; Gu, M H; He, Z Y; Held, T; Heng, Y K; Hou, Z L; Huang, G S; Huang, X T; Hussain, T; Ji, X B; Jiao, J B; Johansson, T; Kloss, B; Kopf, B; Kornicer, M; Kupsc, A; Lai, W; Li, F; Li, J C; Li, Lei; Li, P R; Li, Z B; Liang, Y F; Lin, D X; Liu, B J; Liu, C L; Liu, Feng; Liu, H M; Liu, P L; Lou, X C; Lu, Y; Lu, Y P; Ma, F C; Ma, T; Mao, Z P; Mitchell, R E; Mo, X H; Muchnoi, N Yu; Muramatsu, H; Nikolaev, I B; Niu, X Y; Olsen, S L; Ouyang, Q; Pacetti, S; Poling, R; Qin, L Q; Rashid, K H; Rong, G; Sun, Z T; Tapan, I; Wang, B; Wang, L L; Wang, Y Q; Wen, S P; Werner, M; Wiedner, U; Wolke, M; Xia, Y; Xiao, D; Xu, L; Xu, Q N; Yan, L; Yang, H X; Ye, M H; Yu, B X; Yu, H W; Yu, S P; Yuan, W L; Zang, S L; Zhang, B X; Zhang, J Z; Zhang, S H; Zhang, X Y; Zhao, G; Zhemchugov, A; Zhou, X; Zhou, X K; Zhu, Y S; Zou, B S; Zou, J H
Physical review letters, 2014-Mar-07, Letnik: 112, Številka: 9Journal Article
With data samples collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies from 4.009 to 4.420 GeV, the process e+e-→ γX(3872) is observed for the first time with a statistical significance of 6.3σ. The measured mass of the X(3872) is (3871.9 ± 0.7s tat ± 0.2 syst) MeV/c(2), in agreement with previous measurements. Measurements of the product of the cross section σe+e- → γX(3872) and the branching fraction BX(3872)→π+π-J/ψ at center-of-mass energies 4.009, 4.229, 4.260, and 4.360 GeV are reported. Our measurements are consistent with expectations for the radiative transition process Y(4260) → γX(3872).
