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The ratio of production cross sections of the W and Z bosons with exactly oneassociated jet is presented as a function of jet transverse momentum threshold.The measurement has been designed to maximise cancellation of experimental andtheoretical uncertainties, and is reported both within a particle-levelkinematic range corresponding to the detector acceptance and as a totalcross-section ratio. Results are obtained with the ATLAS detector at the LHC inpp collisions at a centre-of-mass energy of 7 TeV using an integratedluminosity of 33 pb^-1. The results are compared with perturbativeleading-order, leading-log, and next-to-leading-order QCD predictions, and arefound to agree within experimental and theoretical uncertainties. The ratio ismeasured for events with a single jet with p_T > 30 GeV to be 8.73 +/- 0.30(stat) +/- 0.40 (syst) in the electron channel, and $ 8.49 +/- 0.23 (stat) +/-0.33 (syst) in the muon channel.

A measurement of the ratio of the W and Z cross sections with exactly one associated jet in pp collisions at sqrt(s) = 7 TeV with ATLAS