Yasuhito Sakaki, Hidekazu Tanaka
The decay modes $B\to D^{(*)}\tau\bar{\nu_{\tau}}$ are sensitive to charged scalar effects, as the charged Higgs effects. In this paper we suggest a method to determine their effects by using the ratio of branching fractions and forward-backward asymmetry. In particular, forward-backward asymmetry plays an important role, which discriminates the Standard Model from other New Physics scenarios. When considering the Minimal Supersymmetric Standard Model and the Two Higgs Doublet Model type 2, this quantity is almost maximum in the Standard-Model-like scenario, whereas it is minimum in another New Physics one on $B\to D\tau\bar{\nu_{\tau}}$.
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http://arxiv.org/abs/1205.4908
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