Studies of vector boson+jet production with the ATLAS detector

The production of jets or b-jets in association with a leptonically-decaying W or Z boson in proton-proton collisions at 7~TeV is an important test of quantum chromodynamics (QDC). Cross sections have been measured up to high jet multiplicities and compared to new higher-order QCD calculations. The ratio of (Z + a single jet)/(W + a single jet) has also been measured. Overall, the cross sections demonstrate the need for the inclusion of higher-multiplicity matrix elements in the calculations.