| A measurement of the Drell-Yan transverse momentum (pT mumu) distribution above the Z-boson mass region (116 GeV < Mmumu) in proton-proton collisions at a center-of-mass energy of 7 TeV is presented. Results are obtained using Z/gamma* → mu +mu- decays in a data sample collected with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 36 pb -1. The normalized differential cross-section is measured up to p Tmumu of 180 GeV. We measure the ratio of the p Tmumu distribution in the high mass region to that in the Z-boson mass region and multiply it with the high-statistics p Tmumu distribution in the Z-mass region. Both experimental and theoretical uncertainties cancel largely in the cross-section ratio. The results are compared with predictions of perturbative QCD and event generators and are found to agree with the prediction of resummed QCD combined with fixed-order perturbative QCD over the full pTmumu range. |
