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

Tanasijczuk, Andres Jorge;ATLAS;et.al.
(2013) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 720, p. 32 (2013)

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A measurement of angular correlations in Drell-Yan lepton pairs via the @f_@h^@? observable is presented. This variable probes the same physics as the Z/@c^@? boson transverse momentum with a better experimental resolution. The Z/@c^@?->e^+e^- and Z/@c^@?->@m^+@m^- 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 @f_@h^@? 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 @f_@h^@? 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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Tanasijczuk, A. J., ATLAS, & et al. (2013). Measurement of angular correlations in Drell-Yan lepton pairs to probe Z/gamma* boson transverse momentum at sqrt(s)=7 TeV with the ATLAS detector. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 720, 32. https://doi.org/10.1016/j.physletb.2013.01.054 (Original work published 2013)