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Measurement of angular correlations in Drell-Yan lepton pairs to probe Z/γ*boson transverse momentum at √s=7 TeV with the ATLAS detector
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Measurement of angular correlations in Drell-Yan lepton pairs to probe Z/γ*boson transverse momentum at √s=7 TeV with the ATLAS detector

G. Aad, T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, A.A. Abdelalim, O. Abdinov, R. Aben, B. Abi, M. Abolins, …
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 卷.720(1-3), 頁碼.32-51
03/2013
DOI: https://doi.org/10.1016/j.physletb.2013.01.054

摘要

Differential cross section Event generators Monte Carlo models Perturbative QCD Z boson Nuclear and High Energy Physics
A measurement of angular correlations in Drell-Yan lepton pairs via the φ η * observable is presented. This variable probes the same physics as the Z/γ * boson transverse momentum with a better experimental resolution. The Z/γ * →e + e - and Z/γ * →μ + μ - decays produced in proton-proton collisions at a centre-of-mass energy of s=7TeV are used. The data were collected with the ATLAS detector at the LHC and correspond to an integrated luminosity of 4.6 fb -1 . Normalised differential cross sections as a function of φ 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 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. © 2013 CERN.

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