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Achasov, M N; Aliberti, R; Amoroso, A; Cetin, S A; Chen, D Y; Chen, Z J; Cossio, F; Dong, M Y; Fang, S S; Fang, Y; Fava, L; Feldbauer, F; Fritsch, M; Fu, C D; Fu, Y; Gu, M H; Guo, Y P; Han, T T; Heinsius, F H; Herold, C; Huang, Y P; Huesken, N; Hussain, T; Imoehl, W; Ji, X L; Kappert, R; Ke, B C; Koch, L; Lenz, T; Li, H B; Li, L K; Lin, C X; Liu, C X; Liu, H M; Liu, K Y; Liu, T; Liu, X; Liu, Z Q; Lyu, X R; Ma, F C; Ma, X N; Maas, F E; Mao, Y J; Meng, Z X; Mitchell, R E; Mo, X H; Mo, Y J; Nefedov, Y; Nerling, F; Ouyang, Q; Pan, X; Peng, H P; Qi, H R; Qiu, J F; Rong, G; Shen, X Y; Shi, X D; Spataro, S; Sun, G X; Sun, J F; Sun, S S; Sun, T; Wang, C W; Wang, H P; Wang, K; Wang, X; Wang, X F; Wang, Y Q; Wang, Z Y; Wei, D H; White, D J; Wu, L J; Xiao, Y J; Xu, G F; Xu, J J; Yan, L; Yan, W C; Yang, H J; Yang, R X; Yang, S L; Yang, Yifan; You, Z Y; Yu, C X; Yu, G; Yu, J S; Yuncu, A; Zafar, A A; Zhang, J J; Zhang, J W; Zhang, Jiawei; Zhang, Y H; Zhang, Y T; Zhang, Z Y; Zhao, Lei; Zhao, Ling; Zhao, Y B; Zheng, Y; Zheng, Y H; Zhu, A N; Zhu, Z A
Physical review letters, 03/2021, Volume: 126, Issue: 10Journal Article
We report a study of the processes of e^{+}e^{-}→K^{+}D_{s}^{-}D^{*0} and K^{+}D_{s}^{*-}D^{0} based on e^{+}e^{-} annihilation samples collected with the BESIII detector operating at BEPCII at five center-of-mass energies ranging from 4.628 to 4.698 GeV with a total integrated luminosity of 3.7 fb^{-1}. An excess of events over the known contributions of the conventional charmed mesons is observed near the D_{s}^{-}D^{*0} and D_{s}^{*-}D^{0} mass thresholds in the K^{+} recoil-mass spectrum for events collected at sqrts=4.681 GeV. The structure matches a mass-dependent-width Breit-Wigner line shape, whose pole mass and width are determined as (3982.5_{-2.6}^{+1.8}±2.1) MeV/c^{2} and (12.8_{-4.4}^{+5.3}±3.0) MeV, respectively. The first uncertainties are statistical and the second are systematic. The significance of the resonance hypothesis is estimated to be 5.3 σ over the contributions only from the conventional charmed mesons. This is the first candidate for a charged hidden-charm tetraquark with strangeness, decaying into D_{s}^{-}D^{*0} and D_{s}^{*-}D^{0}. However, the properties of the excess need further exploration with more statistics.
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