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We study the Bs → Ds ( * ) l νl semileptonic decays involving the quark level transition b → c l ν, in the framework of the standard model (SM). We calculate the branching ratios and we define observables such as the ratio of branching fractions RD s,D * s for different leptonic modes and R τ, l , where l = e − , μ − for the same leptonic mode and we estimate their numerical values. We also study observables such as the differential branching ratio and forward-backward asymmetry and their implications.

Flavor changing neutral current decays of B meson mediated via b → s l l transition process, where l represents an electron, a muon, or a tau lepton, provide promising probes for physics beyond the standard model. In this context, we use the most general effective Hamiltonian for b → s l l process and study the branching ratio and various asymmetries of B − → p μ + μ − four body baryonic decays of B meson. We also see the effect of various new physics couplings in this decay mode. Within the standard model, the branching ratio of B − → p μ + μ − decay mode is found to be 1.08 × 10 −7 and hence can be tested in the forthcoming or future B factories.