Normalization of QCD corrections in top quark decay
Brian H. Smith, M. B. Voloshin
Abstract
We discuss the effects of QCD corrections to the on-shell decay t b W. We resolve the scale ambiguity using the Brodsky-Lepage-Mackenzie scheme, and find that the appropriate coupling constant is αs MS (0.122mt). The largest long distance contribution comes from the definition of the on-shell mass of the top quark. We note that QCD corrections to the electroweak ρ parameter are extremely small when the ρ parameter is expressed in terms of the top quark width.
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