$\bar{B}\to D\tau {\bar{\nu }}_{\tau }$ in two-Higgs-doublet model

Abstract

We study the exclusive semi-tauonic B decay, $\bar{B}\to D\tau {\bar{\nu }}_{\tau }$, in two-Higgs-doublet models. Using recent experimental and theoretical results on hadronic form factors, we estimate theoretical uncertainties in the branching ratio. As a result, we clarify the potential sensitivity of this mode to the charged Higgs exchange. Our analysis will help to probe the charged Higgs boson at present and future B factory experiments.

Comments: 7 pages, 4 figures, Talk presented by T. Miura at Workshop on Higher Luminosity B Factory, August 23-24, 2001, KEK, Japan