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 $Y_{b}(\Lambda_b,\Sigma_b) \bar K^{(*)}$ and $Y_{b} K^{(*)}$ systems. In particular, a bound state in the $I(J^P)=1/2(1/2^-)$ $\Sigma_{b}\bar{K}/\Lambda_{b}\bar{K}^*/\Sigma_{b}\bar{K}^*$ system may correspond to the particle $\Xi_{b}(6227)$. Meanwhile, the predicted bound state with $6303\sim6269~\rm{MeV}$ in the $I(J^P)=1/2(1/2^-)\Sigma_bK/\Lambda_bK^*/\Sigma_bK^*$ 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 $\Xi_b(6227)$. We highly hope that our proposals can offer helpful information for the future experimental searches.