QCD CORRECTIONS TO CHARGED HIGGS-MEDIATED B-]C-TAU-NU DECAY

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 --> bH(+). 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).