Measurement of Angular Correlations in Drell–Yan Lepton Pairs to Probe Z/γ[superscript ⁎] Boson Transverse Momentum at √s = 7 TeV with the ATLAS Detector
Author(s)
Taylor, Frank E.
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A measurement of angular correlations in Drell–Yan lepton pairs via the ϕ[* over η] observable is presented. This variable probes the same physics as the Z/γ[superscript ⁎] boson transverse momentum with a better experimental resolution. The Z/γ[superscript ⁎] → e[superscript +]e[superscript −] and Z/γ[superscript ⁎] → μ[superscript +]μ[superscript −] decays produced in proton–proton collisions at a centre-of-mass energy of √s = 7 TeV are used. The data were collected with the ATLAS detector at the LHC and correspond to an integrated luminosity of 4.6 fb[superscript −1]. Normalised differential cross sections as a function of ϕ[* over η] are measured separately for electron and muon decay channels. These channels are then combined for improved accuracy. The cross section is also measured double differentially as a function of ϕ[* over η] for three independent bins of the Z boson rapidity. The results are compared to QCD calculations and to predictions from different Monte Carlo event generators. The data are reasonably well described, in all measured Z boson rapidity regions, by resummed QCD predictions combined with fixed-order perturbative QCD calculations or by some Monte Carlo event generators. The measurement precision is typically better by one order of magnitude than present theoretical uncertainties.
Date issued
2013-01Department
Massachusetts Institute of Technology. Department of PhysicsJournal
Physics Letters B
Publisher
Elsevier
Citation
Aad, G., T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, A.A. Abdelalim, O. Abdinov, et al. “Measurement of Angular Correlations in Drell–Yan Lepton Pairs to Probe Z/γ⁎ Boson Transverse Momentum at √s = 7 TeV with the ATLAS Detector.” Physics Letters B 720, no. 1–3 (March 2013): 32–51. © 2013 CERN
Version: Final published version
ISSN
03702693