B meson decays

Abstract

We present an overview of our latest works dedicated to the study of the B(Bc) mesons decays. We computed the branching fractions B → K*(K)ℓ+ℓ- decay where ℓ = μ, τ, ν. We compared the obtained results with available experimental data and the results from other theoretical approaches. The semileptonic decays of the Bc meson is a big interest of B-physics. We found that the theoretical prediction for the ℛJ/ψ is found to be underestimated in comparison with LHCb-data.