Supersymmetric QCD corrections to the W-boson width☆

Abstract We calculate the one-loop supersymmetric QCD corrections to the width of the W -boson. We find that these are of order ∼ α φ M 2 W M 2 S Г u d , where M s is the supersymmetry breaking scale and Γ u d the tree level hadronic width for W + → u d . Due to the appearance of the suppression factor ∼ 1 20 these are at least two orders of magnitude smaller than the standard QCD corrections ∼ α φ Г u d and hence of the order of the two-loop electroweak effects. Therefore supersymmetric QCD corrections will only be of relevance once experiments reach that level of accuracy.