Investigation of low-lying ${\mathrm{\Omega }}_b(1P)$ states in an unquenched coupled-channel framework

In this work, we study the unquenched effects on the low-lying ${\mathrm{\Omega }}_b(1P)$ states with a coupled-channel equations. We reveal how the unquenched effects affect the ${\mathrm{\Omega }}_b(1P)$ spectroscopy and component mixing. The numerical results indicate that the $J^P=1\mathrm{/}{2}^{-}$ ${\mathrm{\Omega }}_b(1P)$ state dominated by the $j_{\mathrm{\ell }}=0$ configuration exhibits significant coupled-channel effects due to its $S$-wave coupling to the ${\mathrm{\Xi }}_b\bar{K}$ channel, where $j_{\mathrm{\ell }}$ denotes the total angular momentum of the light flavor degrees-of-freedom. In this scenario, the mass of this state may be shifted close to or below the ${\mathrm{\Xi }}_b\bar{K}$ threshold, making the radiative and isospin-breaking channels kinematically allowed decay processes. The present analysis provides a coupled-channel perspective on the low-lying ${\mathrm{\Omega }}_b(1P)$ spectrum and offers guidance for future experimental studies of excited bottom baryons.