The $B^{(\ast )}{\bar{K}}^{(\ast )}$-coupled-channel system in the hidden-gauge approach

Abstract

In this work we provide predictions for bottom-strange molecular states within the Hidden Gauge Formalism. We study the coupled-channel scattering of $B^{(\ast )}{\bar{K}}^{(\ast )}$ states and, by fixing only one free parameter to obtain the mass of a new excited $B_s^0$ state seen by the LHCb, we predict the pole parameters of six states in this sector. Concretely, we get that the masses of the flavor partners of the $D_{s0}(2317)$ and $D_{s1}(2460)$ states in the bottom sector are $5760$ and $5802$ MeV for the $B\bar{K}$ ($J^P=0^{+}$) and $B^{\ast }\bar{K}$ ($1^{+}$) states, respectively. Moreover, the recently seen states by the LHCb with masses around $6100$ and $6160$ MeV can be interpreted as $B{\bar{K}}^{\ast }$ and $B^{\ast }{\bar{K}}^{\ast }$ molecular states, according to reasonable values of the pole parameters and the splitting between these two states obtained in our calculation.