Alessandro Tricoli (CERN)
The production of jets in association with a W or Z boson in protonproton collisions at 7 TeV represent an important process to study QCD in a multiscale environment. The cross sections, differential in several kinematics variables, have been measured up to high jet multiplicities and compared to new higherorder QCD calculations. The ratio of (Z + a single jet)/(W + a single jet) can provide a very precise test of QCD and has also been measured. Overall, the cross sections demonstrate the need for the inclusion of highermultiplicity matrix elements in the calculations, even in cases where a parton shower simulation is present.
Uta Klein (University of Liverpool (GB))