We calculate the O(αs) 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 mb2) corrections to the spectator model and comparing the theoretical prediction with the recent experimental measurements, we find a model-independent 2σ upper bound on the ratio of Higgs vacuum expectation values, tan β < 0.52( mH 1 GeV).
|Number of pages||7|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - 14 Sep 1995|
Bibliographical noteFunding Information:
This work was supported in part by the United States-Israel Binational Science Foundation (BSF) . YG thanks Zoltan Ligeti for useful discussions. HEH would like to gratefully acknowledget he kind hospitality of the Weizmann Institute of Science, where this work was completed.T he work of YN is supportedi n part by the BSF, by the Israel Commission for Basic Researcha nd by the Minerva Foundation.