W/Z production at ATLAS and constraints on parton density functions

The production cross sections of the inclusive processes $W o l u$ and $Z/gamma o ll (l = e, mu)$ are measured in proton-proton collisions at $sqrt{s} = 7$ TeV with the ATLAS detector. The cross sections are evaluated integrated over a fiducial kinematic range and differentially as a function of the W decay lepton pseudorapidity and the Z boson rapidity. The integrated and the differential $W^{pm}$ and $Z/gamma$ cross sections are compared with perturbative QCD calculations, based on a number of different parton distribution sets available at NNLO.