Excited bottom and bottom-strange mesons in the quark model

Abstract

In order to understand the possible $q\overline{q}$ quark-model assignments of the ${B}_{J}(5840)$ and ${B}_{J}(5960)$ recently reported by the LHCb Collaboration, we evaluate mass spectra, strong decays, and radiative decays of bottom and bottom-strange mesons in a nonrelativistic quark model. Comparing these predictions with the relevant experimental results, we suggest that the ${B}_{J}(5840)$ and ${B}_{J}(5960)$ can be identified as the $B(2{^{1}S}_{0})$ and $B(1{^{3}D}_{3})$, respectively, and the $B(5970)$ reported by the CDF Collaboration can be interpreted as the $B(2{^{3}S}_{1})$ or $B(1{^{3}D}_{3})$. Further precise measurements of the width, spin and decay modes of the $B(5970)$ are needed to distinguish these two assignments. These predictions of bottom and bottom-strange mesons can provide useful information to further experimental investigations.