Abstract
The first-order electroweak and QCD corrections to the top quark decay width Γ(t → W +b) are presented for the W-boson on shell. Using G F and M W to parametrize the Born decay width, the electroweak corrections are below 2% even for large top quark masses. The QCD corrections are ≈ −10% and depend only weakly on the top quark mass, too.
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