Dependence of Electroweak Parameters on the Definition of the Top-Quark Mass
B. A. Kniehl
Abstract
The QCD corrections to electroweak parameters depend on the renormalization scheme and scales used to define the top-quark mass. We analyze these dependences for the W-boson mass predicted via Delta r to O(alpha alphas) and O(alpha alphas2) in the on-shell and MS-bar schemes. These variations provide us with a hint on the magnitude of the unknown higher-order QCD effects and contribute to the theoretical error of the prediction.
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