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This report was prepared in the context of the LPCC "Electroweak PrecisionMeasurements at the LHC WG" and summarizes the activity of a subgroup dedicatedto the systematic comparison of public Monte Carlo codes, which describe theDrell-Yan processes at hadron colliders, in particular at the CERN Large HadronCollider (LHC). This work represents an important step towards the definitionof an accurate simulation framework necessary for very high-precisionmeasurements of electroweak (EW) observables such as the $W$ boson mass and theweak mixing angle. All the codes considered in this report share at leastnext-to-leading-order (NLO) accuracy in the prediction of the total crosssections in an expansion either in the strong or in the EW coupling constant.The NLO fixed-order predictions have been scrutinized at the technical level,using exactly the same inputs, setup and perturbative accuracy, in order toquantify the level of agreement of different implementations of the samecalculation. A dedicated comparison, again at the technical level, of threecodes that reach next-to-next-to-leading-order (NNLO) accuracy in quantumchromodynamics (QCD) for the total cross section has also been performed. Thesefixed-order results are a well-defined reference that allows a classificationof the impact of higher-order sets of radiative corrections. Several examplesof higher-order effects due to the strong or the EW interaction are discussedin this common framework. Also the combination of QCD and EW corrections isdiscussed, together with the ambiguities that affect the final result, due tothe choice of a specific combination recipe.

Precision Studies of Observables in pp->W->l nu and pp->gamma,Z->l+l- processes at the LHC