Normalization of QCD corrections in top quark decay

Brian H. Smith; M. B. Voloshin

doi:10.1016/0370-2693(94)01270-9

paper

Normalization of QCD corrections in top quark decay

arXiv:hep-ph/9405204 · doi:10.1016/0370-2693(94)01270-9

Abstract

We discuss the effects of QCD corrections to the on-shell decay $t \to bW$ . We resolve the scale ambiguity using the Brodsky-Lepage-Mackenzie scheme, and find that the appropriate coupling constant is $α_{s}^{M S} (0.122 m_{t})$ . 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.

7 pages (LaTeX), TPI-MINN-94/16-T, UMN-TH-1252/94