New gauge boson W^prime and radiative leptonic decays of charged B and D mesons

Abstract

Considering the constraints on model parameters from the latest experimental data, we study the contributions of new gauge boson W^prime predicted by the general 221 models to the radiative leptonic decays of charged B and D mesons. It is found that the largest contributions of W^prime in the non-universal 221 model to the branching fractions occur in the decay modes B^{-} rightarrow gamma mu ^{-} bar{nu }_mu and B^{-} rightarrow gamma tau ^{-} bar{nu }_tau , which can reach to about 8 % of the corresponding SM values in the up-quark mixing scenario. In contrast, the relative corrections of W^prime predicted by the un-unified 221 model to the branching fractions are very tiny and identical for all the decay modes.