B → D(*)τντ decays in two-Higgs-doublet models

Abstract

A sizable excess with respect to the SM expectation has been reported recently by the BaBar collaboration in the decay rates B → D(*)τν, normalized by the corresponding light lepton modes. A violation of lepton flavor universality as suggested by this excess could be due to a charged Higgs mediating these processes at tree level. In this talk we analyze the implications of the observed excess within the framework of two-Higgs-doublet models, considering also the bounds from other semileptonic and leptonic decays of B and D(s) mesons. Prospects for B → D(*)τν decays at future Super-Flavor Factories are also discussed.