Investigation of hidden-charm pentaquarks with strangeness $S=-1$

Abstract

Recently, a new hidden-charm pentaquark state $P_{cs}(4459)$ was reported by the LHCb Collaboration. Stimulated by the fact that all hidden-charm pentaquark states in $S=0$ systems were successfully predicted by our chiral quark model, we extended this study to the $S=-1$ systems. All possible quantum numbers $I{J}^P=0(\frac{1}{2}{)}^{-}$, $0(\frac{3}{2}{)}^{-}$, $0(\frac{5}{2}{)}^{-}$, $1(\frac{1}{2}{)}^{-}$, $1(\frac{3}{2}{)}^{-}$ and $1(\frac{5}{2}{)}^{-}$ have been investigated. The calculation results shows that the newly observed state $P_{cs}(4459)$ can be explained as ${\Xi }_c{\bar{D}}^{\ast }$ molecular state and the quantum number is $0(\frac{1}{2}{)}^{-}$. In addition, we also find other molecular states ${\Xi }_c\bar{D}$, ${\Xi }_c^{\ast }\bar{D}$ and ${\Xi }_c^{\prime }{\bar{D}}^{\ast }$. It is worth mentioning that ${\Xi }_c{\bar{D}}^{\ast }$ can form a two-peak structure from states in system $0(\frac{1}{2}{)}^{-}$ and $0(\frac{3}{2}{)}^{-}$. The decay width of all molecular states is given with the help of real scaling method. These hidden-charm pentaquark states is expected to be further verified in future experiments.

Comments: 9 pages, 5 figures. arXiv admin note: text overlap with arXiv:2010.14984