CC10 at ${\cal O}(α_s )$: QCD corrections to $e^+ e^- \to μ^- \bar ν_μu \bar d$ at LEP2 and the Next Linear Collider

QCD one-loop corrections to the semileptonic process $e^+ e^- \to \mu^- \bar \nu_\mu u \bar d$ are computed. We compare the exact calculation with a ``naive'' approach to strong radiative corrections which has been widely used in the literature and discuss the phenomenological relevance of QCD contributions for LEP2 and NLC physics.