$B_{sJ}(6114)$ as a Higher-Partial-Wave ${\bar{K}}^{\ast }{B}^{(\ast )}$ Molecular Candidate

In 2021, the LHCb Collaboration observed the $B_{sJ}(6114)$ state in the $B^{\pm }{K}^{\mp }$ invariant mass spectrum. It is currently the highest-mass bottom-strange state listed by the Particle Data Group (PDG). However, its spin-parity quantum numbers have not yet been experimentally determined, and its internal structure remains under debate. Although several quark-model interpretations have been proposed, including the $1^3{D}_1$ state and a member of the $1D(2^{-},3^{-})$ doublet, the possibility of a hadronic molecular structure for this state has not yet been systematically investigated. We investigate the possibility of interpreting $B_{sJ}(6114)$ as a $B^{(\ast )}{\bar{K}}^{\ast }$ molecular state within the one-boson-exchange model. By solving the Schrödinger equation using the Gaussian expansion method, we study the bound-state properties with different spin-parity assignments, taking into account partial-wave mixing and coupled-channel effects. We further calculate the strong decay widths into the allowed $B^{(\ast )}\bar{K}$ channels and compare them with the experimental data. Our results show that the mass spectrum alone cannot uniquely determine the spin-parity of $B_{sJ}(6114)$. However, the decay-width analysis disfavors the $J^P=0^{+}$, $0^{-}$, $1^{+}$, $2^{+}$, and $3^{-}$ assignments, while the $J^P=1^{-}$, $2^{-}$, and $3^{+}$ configurations remain compatible with the experimental constraints. Among these possibilities, the $J^P=1^{-}$ assignment provides the best agreement with the measured decay width. These findings suggest that $B_{sJ}(6114)$ may be a higher-partial-wave $B^{(\ast )}{\bar{K}}^{\ast }$ molecular state.