Standard model precision tests at hadron colliders : theoretical control on Drell Yan processes

After discussing the relevance of single-W and single-Z production processes at hadron colliders, we review the theoretical knowledge of Drell--Yan physics and present some preliminary results on the combination of electroweak and QCD corrections to a sample of observables of the process pp \to W\pm \to \mu \pm + X at the LHC. Our phenomenological analysis shows that a high-precision knowledge of QCD and a careful combination of electroweak and strong contributions is mandatory in view of the anticipated LHC experimental accuracy.