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arXiv · hep-ph/9405204

Normalization of QCD corrections in top quark decay

Brian H. Smith·M. B. Voloshin
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Abstract

We discuss the effects of QCD corrections to the on-shell decay $t \to b W$. We resolve the scale ambiguity using the Brodsky-Lepage-Mackenzie scheme, and find that the appropriate coupling constant is $α_{s}^{ \overline{MS}} (0.122m_{t})$. 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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Brian H. Smith, M. B. Voloshin. 1994-05-02. Normalization of QCD corrections in top quark decay. https://doi.org/10.1016/0370-2693(94)01270-9

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