B -> D(*) Tau Nu decays in two-Higgs-doublet models

TL;DR

This paper investigates the potential explanation of the BaBar observed excess in B -> D(*) Tau Nu decays via charged Higgs contributions within two-Higgs-doublet models, considering existing decay constraints and future experimental prospects.

Contribution

It provides a detailed analysis of how two-Higgs-doublet models can account for the BaBar excess and explores implications for future measurements.

Findings

Charged Higgs can explain the excess within certain parameter ranges.

Existing decay data constrains the model parameters.

Future experiments could further test these 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(*) Tau Nu, 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(*) Tau Nu decays at future Super-Flavor Factories are also discussed.