Measurement of the cross sections for the production of W and Z bosons in association with jets and heavy flavours in pp collisions at √ s = 7 TeV with the ATLAS detector

Measurement of the cross sections for the production of W and Z bosons in association with jets and heavy flavours in pp collisions at √ s = 7 TeV with the ATLAS detector Preliminary measurements are presented of the cross sections for the production of W and Z bosons in association with jets in pp collisions at √ s = 7 TeV. The measurements are based on 35 pb −1 of data collected with the ATLAS detector at the LHC. The cross sections are measured for the electron and muon decay channels of the W and Z bosons, and for jets reconstructed with the anti-k t clustering algorithm. Jets containing b-hadrons are identified and measured. Inclusive and differential results are presented as a function of jet multiplicity and kinematics. A measurement of the ratio of the W and Z plus one jet production cross section is also presented. The results are compared with leading and next-to-leading order QCD predictions.