W+jets in pp collisions at 7 TeV with ATLAS

We present measurements of differential and inclusive cross sections of W boson production in association with jets, and jets containing b hadrons. The measurements are based on 35 pb-1 of pp collisions at 7 TeV collected with the ATLAS detector at the LHC, using the electron and muon decay channels of the W boson. The data are found to be compatible with next-to-leading order predictions. In addition, we present a study of the invariant mass distribution of jet pairs produced in association with a $W$~boson, based on an integrated luminosity of 1.02 fb-1. The measured dijet mass shows no significant excess over the Standard Model expectation.