QCD corrections tot→W++b

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Abstract

The $O({\ensuremath{\alpha}}_{s})$ QCD corrections to the process $t\ensuremath{\rightarrow}{W}^{+}b$ are calculated in the standard model for a heavy top quark. For $\frac{{m}_{W}}{{M}_{t}}<0.8$, the corrections reduce the partial width by 10% relative to the tree-level result. This reduction of the top-quark width enhances the signal for $t\overline{t}$ bound-state resonances near threshold in ${e}^{+}{e}^{\ensuremath{-}}$ collisions, studied recently by Strassler and Peskin.

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