A coupled-channel perspective analysis on bottom-strange molecular pentaquarks

Abstract

At present work, we systematically study various bottom-strange molecular pentaquarks to search for possible bound states and resonances by adopting one-boson-exchange model within complex scaling method. According to our calculations, we predict several bound and resonant states for bottom baryon $Y_b(\hat{I}{›}_b,\hat{I}{\pounds }_b){\bar{K}}^{(\ast )}$ and $Y_b{K}^{(\ast )}$ systems. In particular, a bound state in the $I(J^P)=1/2(1/2^{-})$ $\hat{I}{\pounds }_b\bar{K}/\hat{I}{›}_b{\bar{K}}^{\ast }/\hat{I}{\pounds }_b{\bar{K}}^{\ast }$ system may correspond to the particle $\hat{I}{ž}_b(6227)$. Meanwhile, the predicted bound state with $6303\sim 6269\mathrm{MeV}$ in the $I(J^P)=1/2(1/2^{-})\hat{I}{\pounds }_{b}K/\hat{I}{›}_b{K}^{\ast }/\hat{I}{\pounds }_b{K}^{\ast }$ system is flavor exotic and does not appear in the spectroscopy of conventional baryons, which provides a practical way to clarify the nature of particle $\hat{I}{ž}_b(6227)$. We highly hope that our proposals can offer helpful information for the future experimental searches.