Radiative decay of ${\Xi }_b(6227)$ in a hadronic molecule picture

Abstract

The ${\Xi }_b(6227)$ baryon with the quantum number $J^P=1/2^{-}$ is considered as a molecular state composed of a ${\Sigma }_b$ baryon and $\bar{K}$ meson. The partial decay widths of the ${\Sigma }_b\bar{K}$ molecular state into ${\Xi }_b\gamma$ and ${\Xi }_b^{{}^{\prime }}\gamma$ final states through hadronic loops are evaluated with the help of the effective Lagrangians. The partial widths for the ${\Xi }_b(6227)\to \gamma {\Xi }_b$ and ${\Xi }_b(6227)\to \gamma {\Xi }_b^{{}^{\prime }}$ are evaluated to be about 1.50-1.02 KeV and 17.56-24.91 KeV, respectively, which may be accessible for the LHCb. Based on our results we argue that an experimental determination of the radiative decay width of ${\Xi }_b(6227)$ is important for the understanding of its intrinsic properties.