论文标题
$ d_s^+d_s^ - $ b^+\中的$ threshold Enhancement之间
Connection between near the $D_s^+D_s^-$ threshold enhancement in $B^+ \to D_s^+D_s^-K^+$ and conventional charmonium $χ_{c0}(2P)$
论文作者
论文摘要
重点关注$ b^+\至d_s^+d_s^-k^+$过程，由LHCB协作给出，我们建议，在$ d_s^+d_s^ - $ d_s^ - $ threshold Enhancement附近，可能是由于$ ub $ d_s^+d_s^ - $阈值。通过对测量的$ d_s^+d_s^ - $，$ d_s^+k^+$和$ d_S^-k^+$不变质量谱进行组合拟合，引入了$χ_{c0}（2p）$可以很好地重现$ d_s^+d_s^$ d_ $ $ $ yevempecy的接近阈值。当描绘整个$ d_s^+d_s^ - $不变质量谱时，较高charmonium $ψ（4230）$和charmoniumliumike state $ x_0（4140）$的贡献显而易见。此外，发现一个Charmed Meson $ d^*（3^3S_1）$，质量约为3015 MEV，这对于描绘$ d_s^-k^+$不变的质量光谱非常重要。尤其是，揭示了$χ_{C0}（2p）$空间波函数的节点效应的重要性，通过该效应的比率$γ（x \ to d^+d^ - ）/γ（x \ to d_s^+d_s^+d_s^ - ）$的异常可以很好地解释。最后，我们对新观察到的增强结构的场景是由$χ_{C0}（2p）$实施的。
Focusing on recent measurement of $B^+ \to D_s^+D_s^-K^+$ process given by the LHCb Collaboration, we propose that this newly observed near the $D_s^+D_s^-$ threshold enhancement can be due to the contribution of the $χ_{c0}(2P)$, which is a $P$-wave charmonium below the $D_s^+D_s^-$ threshold. By performing a combined fit to the measured $D_s^+D_s^-$, $D_s^+K^+$, and $D_s^-K^+$ invariant mass spectra, introducing the $χ_{c0}(2P)$ can well reproduce the near threshold enhancement in the $D_s^+D_s^-$ invariant mass spectrum. When depicting the whole $D_s^+D_s^-$ invariant mass spectrum, the contributions from higher charmonium $ψ(4230)$ and charmoniumlike state $X_0(4140)$ are obvious. In addition, a charmed meson $D^*(3^3S_1)$ with mass around 3015 MeV is found to be important to depict the $D_s^-K^+$ invariant mass spectrum well. Especially, the importance of node effect of the spatial wave function of the $χ_{c0}(2P)$ is revealed, by which the anomaly of the ratio $Γ(X\to D^+D^-)/Γ(X\to D_s^+D_s^-)$ indicated by LHCb can be explained well. Finally, our scenario of the newly observed enhancement structure resulted from the $χ_{c0}(2P)$ is enforced.
