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
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Aad-2013-Measurement of angul.pdf
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1.35 MB
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6da4e9b94b14cb230a3b15db84ac304f
Author(s)
Taylor, Frank E.
Date Issued
January 2013
Journal
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
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Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1016/j.physletb.2013.01.054
