Date of Award
Doctor of Philosophy
Physics and Astronomy
A measurement of the Drell-Yan transverse momentum (pTμμ) distribution above the Z-boson mass region (116 GeV < Mμμ) in proton-proton collisions at a center-of-mass energy of 7 TeV is presented. Results are obtained using Z/γ* → μ+μ- 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 pTμμ of 180 GeV. We measure the ratio of the pTμμ distribution in the high mass region to that in the Z-boson mass region and multiply it with the high-statistics pTμμ 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 pTμμ range.
Yamamoto, Kyoko, "Measurement of the Drell-Yan differential cross-section d(sigma)/d(pT) at high dilepton mass in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector" (2012). Graduate Theses and Dissertations. 12533.