Observation of a Near-Threshold Structure in the K^{+} Recoil-Mass Spectra in e^{+}e^{-}→K^{+}(D_{s}^{-}D^{0}+D_{s}^{-}D^{0})

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...

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Veröffentlicht in:Physical review letters 2021-03, Vol.126 (10), p.102001-102001, Article 102001
Hauptverfasser: Ablikim, M, Achasov, M N, Adlarson, P, Ahmed, S, Albrecht, M, Aliberti, R, Amoroso, A, An, Q, Anita, Bai, X H, Bai, Y, Bakina, O, Baldini Ferroli, R, Balossino, I, Ban, Y, Begzsuren, K, Berger, N, Bertani, M, Bettoni, D, Bianchi, F, Biernat, J, Bloms, J, Bortone, A, Boyko, I, Briere, R A, Cai, H, Cai, X, Calcaterra, A, Cao, G F, Cao, N, Cetin, S A, Chang, J F, Chang, W L, Chelkov, G, Chen, D Y, Chen, G, Chen, H S, Chen, M L, Chen, S J, Chen, X R, Chen, Y B, Chen, Z J, Cheng, W S, Cibinetto, G, Cossio, F, Cui, X F, Dai, H L, Dai, X C, Dbeyssi, A, de Boer, R B, Dedovich, D, Deng, Z Y, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, L Y, Dong, M Y, Dong, X, Du, S X, Fang, J, Fang, S S, Fang, Y, Farinelli, R, Fava, L, Feldbauer, F, Felici, G, Feng, C Q, Fritsch, M, Fu, C D, Fu, Y, Gao, Y, Gao, Y G, Garzia, I, Gersabeck, E M, Gilman, A, Goetzen, K, Gong, L, Gong, W X, Gradl, W, Greco, M, Gu, L M, Gu, M H, Gu, S, Gu, Y T, Guan, C Y, Guo, A Q, Guo, L B, Guo, R P, Guo, Y P, Guskov, A, Han, T T, Hao, X Q, Harris, F A
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Sprache:eng
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Zusammenfassung: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 sqrt[s]=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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.126.102001