Semileptonic decays $B/B_s \to (D^{(*)},D_s^{(*)}) l ν_l$ in the PQCD approach with the lattice QCD input

Abstract

In this paper, we studied the semileptonic B/B s → (D ( * ) , D ( * ) s )lν l decays in the framework of the standard model (SM) , by employing the perturbative QCD (PQCD) factorization formalism combining with the lattice QCD inputs of the relevant transition form factors. We calculated the branching ratios B(B (s) → D ( * ) (s) lν l ) with l = (e, µ.τ ) , the ratios of the branching ratios R(D ( * ) ) and R(D ( * ) s ) and other physical observables P τ (D ( * ) (s) ), F L (D * (s) ) and A F B (τ ).The "PQCD+Lattice" predictions for B(B → D ( * ) lν l ) and R(D ( * ) ) do agree well with those currently available experimental measurements within the errors. For the ratios R(D s ) and R(D * s ), the "PQCD+Lattice" predictions agree well with other known predictions. For both P τ (D * ) and F L (D * ), our theoretical predictions agree well with the measured values within errors. Our theoretical predictions about the considered semileptonic B/B s decays could be tested in the near future LHCb and the Belle II experiments.

Implication of b→cτν¯τ flavor anomalies on Bs→Ds*τν¯τ decay observables

“…Very recently in reference [98], the authors perform a model independent analysis on B s → D * s l νl decay mode by considering pQCD form factors. Also in reference [99], the authors discuss the SM results of…”