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An, M R; Begzsuren, K; Chang, J F; Chang, W L; Choi, S K; Dai, H L; Denysenko, I; Duan, Z H; Fan, Y L; Fritsch, M; Fu, C D; Gao, H; Geng, C; Gramigna, S; Guan, Z L; Hu, J F; Huang, K X; Hüsken, N; Jeong, J H; Jiang, X S; Jiao, Z; Jin, Y; Kui, X; Kappert, R; Ke, B C; Kupsc, A; Li, F; Li, J W; Li, Ke; Li, L J; Lin, T; Liu, C X; Liu, D; Liu, Lu; Liu, W K; Liu, X; Lou, X C; Lu, X L; Luo, T; Lyu, Y F; Ma, J L; Ma, X Y; Maggiora, M; Mitchell, R E; Nerling, F; Plura, S; Qian, W B; Qin, X P; Qin, Z H; Sarantsev, A; Shan, X Y; Shangguan, J F; Song, Y X; Sosio, S; Su, Y J; Sun, Y J; Teng, J X; Uman, I; Wang, C W; Wang, D Y; Wang, K; Wang, Y Q; Wang, Yi; Wang, Ziyi; Wei, D H; Weidner, F; Wiedner, U; Wilkinson, G; Wolke, M; Wu, L J; Wu, Y; Xian, X M; Xiao, G Y; Xie, X H; Xu, C J; Xu, G F; Xu, Z P; Yan, F; Yan, W B; Ye, M H; You, Z Y; Yu, G; Yuan, S C; Yuan, Y; Yuan, Z Y; Zeng, F R; Zhan, Y H; Zhang, B X; Zhang, J W; Zhang, J Y; Zhang, Jiawei; Zhang, Lei; Zhang, P; Zhang, Q Y; Zhang, Shulei; Zhang, Y H; Zhang, Z L; Zhu, K; Zhu, S H; Zhu, Y C
Physical review letters, 10/2023, Volume: 131, Issue: 15Journal Article
A narrow structure in the pΛover ¯ system near the mass threshold, named as X(2085), is observed in the process e^{+}e^{-}→pK^{-}Λover ¯ with a statistical significance greater than 20σ. Its spin and parity are determined for the first time to be J^{P}=1^{+} in an amplitude analysis, with a statistical significance greater than 5σ over other quantum numbers (0^{-},1^{-} and 2^{+}). The pole positions of X(2085) are measured to be M_{pole}=(2084_{-2}^{+4}±9) MeV and Γ_{pole}=(58_{-3}^{+4}±25) MeV, where the first uncertainties are statistical and the second ones are systematic. The analysis is based on the study of the process e^{+}e^{-}→pK^{-}Λover ¯ and uses the data samples collected with the BESIII detector at the center-of-mass energies sqrts=4.008, 4.178, 4.226, 4.258, 4.416, and 4.682 GeV with a total integrated luminosity of 8.35 fb^{-1}.
