QCD corrections to e+e−→u d̄ s c̄

QCD one-loop corrections to the full gauge invariant set of electroweak diagrams describing the hadronic process e+e−→u d̄ s c̄ are computed. Four-jet shape variables for WW events are studied at next-to-leading order and the effects of QCD corrections on the determination of the W-mass in the hadronic channel at Lep 2 and NLC is discussed. We compare the exact calculation with a “naive”approach to strong radiative corrections which has been widely used in the literature.