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Institute of High Energy Physics, Beijing 100049, People's Republic of China.
G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia.
Phys Rev Lett. 2021 Mar 12;126(10):102001. doi: 10.1103/PhysRevLett.126.102001.
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.
我们报告了一项基于在北京正负电子对撞机（BEPCII）上运行的北京谱仪III（BESIII）探测器收集的正负电子湮灭样本，对(e^{+}e^{-}\to K^{+}D_{s}^{-}D^{0})和(K^{+}D_{s}^{-}D^{0})过程的研究。该样本在五个质心能量范围从4.628到4.698 GeV下收集，总积分亮度为3.7 fb⁻¹。在(\sqrt{s}=4.681) GeV收集的事件的(K^{+})反冲质量谱中，在(D_{s}^{-}D^{0})和(D_{s}^{-}D^{0})质量阈值附近，观察到超过传统粲介子已知贡献的事件过剩。该结构符合质量依赖宽度的布雷特-维格纳线形，其极点质量和宽度分别确定为((3982.5_{-2.6}^{+1.8}±2.1)) MeV/c²和((12.8_{-4.4}^{+5.3}±3.0)) MeV。第一个不确定度是统计性的，第二个是系统性的。共振假设的显著性估计在仅来自传统粲介子的贡献之上为5.3 σ。这是第一个具有奇异数的带电隐藏粲四夸克候选者，衰变为(D_{s}^{-}D^{0})和(D_{s}^{-}D^{0})。然而，过剩部分的性质需要用更多统计数据进一步探索。
