Selected decays of $B_{s}$ meson in covariant confined quark model

Abstract: We present a study of various $B_{s}$ meson decays, including hadronic and semileptonic final states with different spins and diagram topologies. The covariant confined quark model is employed to describe hadronic effects, and our analysis serves as a broad test of the current understanding of the underlying dynamics within the Standard Model. The level of agreement with experimental data varies across channels: it is good for the semileptonic decays $B_{s}^{0}\to D_{s}^{-}μ^{+}ν_μ$ and $B_{s}^{0}\to K^{-}μ^{+}ν_μ$; acceptable for the hadronic modes $B_{s}^{0}\to D_{s}^{-}D^{+}$ and $B_{s}^{0}\to K^{-}π^{+}$; marginal for $B_{s}^{0}\to D_{s}^{-}π^{+}$, $B_{s}^{0}\to D_{s}^{-}ρ^{+}$, and $B_{s}^{0}\toφ\,J/ψ$; and significantly discrepant for $B_{s}^{0}\toφ\,\overline{D^{0}}$ and $B_{s}^{0}\toφ\,η_{c}$. We argue that the observed inconsistencies may arise from the breakdown of naive factorization and unaccounted long-distance effects. In particular, the channels $B_{s}^{0}\to D_{s}^{-}π^{+}$ and $B_{s}^{0}\to D_{s}^{-}ρ^{+}$ are theoretically among the cleanest nonleptonic decays, yet they exhibit persistent discrepancies also reported by other theoretical groups.