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QCD corrections to charged Higgs-mediated $b \to c \tau \nu$ decay
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abstract
We calculate the $O(\alpha_s)$ corrections to the charged Higgs mediated inclusive semi-tauonic $B$ decay. By working in the Landau gauge, we demonstrate how to obtain the charged Higgs contributions (both direct and interference terms) from the known QCD corrections to $t \to b H^+$. Combining our results with $O(1/m_b^2)$ corrections to the spectator model and comparing the theoretical prediction with the recent experimental measurements, we find a model-independent $2\sigma$ upper bound on the ratio of Higgs vacuum expectation values, $\tan\beta<0.52(m_H/1 GeV)$.
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