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 $\sqrt{s}$ = 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 are measured in association with jets with transverse momentum $p_T$ > 30 GeV and jet rapidity $|y|$ < 4.4. The measurements are compared to next-to-leading-order perturbative QCD calculations and to predictions from different Monte Carlo generators implementing leading-order matrix elements supplemented by parton showers.

20 pages plus author list + cover pages (35 pages total), 10 figures, 7 tables, submitted to Eur. Phys. J. C. All figures, including auxiliary figures, are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2012-25/

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• Precision QCD Physics at the LHC
• Vector Bosons and Jets in Proton Collisions
• Extrapolating W-Associated Jet-Production Ratios at the LHC