$e^+e^-\to K^+ (D_s^- D^{*0} + D^{*-}_s D^0)$的$K^+$反冲质谱中近阈结构的观测
Observation of a near-threshold structure in the $K^+$ recoil-mass spectra in $e^+e^-\to K^+ (D_s^- D^{*0} + D^{*-}_s D^0)$
摘要：
本文报道了基于运行在BEPCII上的BESIII探测器收集的$e^+e^-$湮灭样品的$e^+e^-\to K^+ (D_s^- D^{*0} + D^{*-}_s D^0)$过程的研究，这些样品的质心能量范围为4.628 ~ 4.698 GeV，总积分光度为3.7 fb $^{-1}$ .对于在$\sqrt{s}=4.681$ GeV收集的事件，在$K^{+}$反冲质谱中的$D_s^- D^{*0}$和$D^{*-}_s D^0$质量阈值附近观察到超过常规粲介子的已知贡献的过量。该结构匹配的质量依赖的宽度Breit-Wigner线的形状，其极质量和宽度被确定为$(3982.5^{+1.8}_{-2.6}\pm2.1)$ MeV/ $c^2$和$(12.8^{+5.3}_{-4.4}\pm3.0)$ MeV，分别。第一种不确定性是统计性的，第二种是系统性的。共振假设的意义估计为5.3 $σ$的贡献，只有从传统的粲介子。这是第一个具有奇异性的带电隐魅四夸克的候选者，衰变为$D_s^- D^{*0}$和$D^{*-}_s D^0$。然而，过剩的性质需要更多的统计数据进行进一步的探索。
英文摘要：
We report a study of the processes of $e^+e^-\to K^+ (D_s^- D^{*0} + D^{*-}_s D^0)$ 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 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 $(3982.5^{+1.8}_{-2.6}\pm2.1)$ MeV/$c^2$ and $(12.8^{+5.3}_{-4.4}\pm3.0)$ 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 of the 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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