论文标题
$ξ_c^0 $在手性夸克模型中的调查
Investigation of $Ξ_c^0$ in a chiral quark model
论文作者
论文摘要
最近，在$λ^+_ ck^ - $的不变质量谱中观察到了三个新的状态。在这项工作中，我们使用手性夸克模型在三夸克结构和五夸克结构的帮助下，在所有可能的量子数字中，借助高斯膨胀方法来研究这三个已退出的状态，所有可能的量子数$ ij^p = \ frac {1} {1} {2} {2} {2} {2} $ \ frac {1} {2}（\ frac {3} {2}）^ - $，$ \ frac {1} {2} {2} {2}（\ frac {5} {2} {2} {2}）^ - $，$，$ \ frac {3} $ \ frac {3} {2}（\ frac {3} {2}）^ - $和$ \ frac {3} {2} {2}（\ frac {5} {2} {2}）^ - $。计算表明，$ξ_c'（2579）^0 $和$ξ_c（2645）^0 $的2 $ s $状态与实验结果相当；此外，还通过使用真实的缩放法及其衰减宽度，是这些新状态的五夸克配置的共振状态。
Recently, three new states of $Ξ_c^0$ were observed in the invariant mass spectrum of $Λ^+_cK^-$ by LHCb collaboration. In this work, we use a chiral quark model to investigate these three exited states with the help of Gaussian expansion method both in three-quark structure and in five-quark structure with all possible quantum numbers $IJ^P=\frac{1}{2}(\frac{1}{2})^-$, $\frac{1}{2}(\frac{3}{2})^-$, $\frac{1}{2}(\frac{5}{2})^-$, $\frac{3}{2}(\frac{1}{2})^-$, $\frac{3}{2}(\frac{3}{2})^-$ and $\frac{3}{2}(\frac{5}{2})^-$ . The calculations shows that the 2$S$ states of $Ξ_c'(2579)^0$ and $Ξ_c(2645)^0$ are comparable to experimental results; In addition, the resonance states of five-quark configuration are possible candidates of these new states with negative parity by using the real scaling method and their decay width are also given.
