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Fe b 19 96 JHU – TIPAC – 96004 hep-ph / 9602410 Scale Setting in Top Quark Decays

We study the effect of higher order QCD corrections on the Standard Model decay t → W+b as well as the non standard decay t → H+b. For t → W+b, we use the BLM method to resolve the scale ambiguity in the leading order correction. The BLM scale, in the MS scheme, for this decay is 0.09 mt; using this result we find that QCD corrections reduce the top quark width by 13%. For t → H+b, we correct an error in the calculation of O(αs) corrections currently existing in the literature. We study the dependence of the BLM scale on the charged Higgs mass. We find that the BLM procedure can give very different results depending on whether the tree level rate is expressed as a function of the top quark pole mass or running mass.