Model-independent investigation of rare semileptonic b →ul ν l decay processes MODEL-INDEPENDENT INVESTIGATION of RARE ⋯ SUCHISMITA SAHOO, ATASI RAY, and RUKMANI MOHANTA

Abstract

Motivated by the recent observation of lepton universality violation in the flavor changing charged current transitions b→clνl, we intend to scrutinize the lepton nonuniversality effects in rare semileptonic B meson decays involving the quark-level transitions b→ulνl. In this regard, we envisage the model-independent approach and consider the generalized effective Lagrangian in the presence of new physics and constrain the new parameters by using the experimental branching fractions of Bu+→l+νl and B-→π0μ-νμ processes, in which l=e, μ, τ. We then estimate the branching ratios and forward-backward asymmetries of B(s)→P(V)lνl processes, in which P(=K,π,η(′)) denotes the pseudoscalar meson and V(=K∗,ρ) is the vector meson. We also find out various lepton nonuniversality parameters in these processes in the presence of new physics.