A measurement of the ratio of the production cross sections for W and Z bosons in association with jets with the ATLAS detector

Abstract

The ratio of the production cross sections for W and Z bosons in association with jets has been measured in proton–proton collisions at √ s = 7 TeV with the ATLAS experiment at the Large Hadron Collider. The measurement is based on the entire 2011 dataset, corresponding to an integrated luminosity of 4.6 fb−1. Inclusive and differential cross-section ratios for massive vector bosons decaying to electrons and muons aremeasured in association with jets with transverse momentum pT > 30 GeV and jet rapidity |y| < 4.4. The measurements are compared to nextto- leading-order perturbative QCD calculations and to predictions from different Monte Carlo generators implementing leading-order matrix elements supplemented by parton showers.