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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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ATLAS Collaboration (Including: Jones, G. (Graham) and Farrington, Sinead). (2013) 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, Volume 720 (Number 1-3). pp. 32-51. doi:10.1016/j.physletb.2013.01.054 ISSN 0370-2693.
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WRAP_ATLAS_1-s2.0-S0370269313000956-main.pdf - Published Version Available under License Creative Commons Attribution. Download (1528Kb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.physletb.2013.01.054
Abstract
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 = 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−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.
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