W and Z Production measured using the ATLAS Detector and impact on Parton Densities of the proton

Inclusive and differential cross sections for W and Z production are presented, as well as the lepton charge asymmetry as a function of lepton pseudorapidity. The data from pp collisions at 7 TeV that were collected during 2010 using the ATLAS detector at the Large Hadron Collider at CERN, are compared to the predictions of perturbative QCD calculations based on a number of different parton distribution sets available at next-to-next-to leading order. The impact of these measurements on the knowledge of the structure of the proton is discussed. Finally, a measurement of the ratio of the W + one to Z + one jet cross sections, that was performed for the first time, is presented.