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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

CollaborationWith : Abdelalim Aly, Ahmed Aly / Alexandre, Gauthier / Backes, Moritz / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Bucci, Francesca / Clark, Allan Geoffrey / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Gonzalez Sevilla, Sergio / Goulette, Marc / Iacobucci, Giuseppe / La Rosa, Alessandro / Lister, Alison / Martin Dit Latour, Bertrand / Mermod, Philippe / Mora Herrera, Maria Clemencia Rosario / Nektarijevic, Snezana / Nikolics, Katalin / Pasztor, Arpad / Picazio, Attilio / Pohl, Martin / Rosbach, Kilian / Rosselet, Laurent / Wu, Xin
Published in Physics Letters. B. 2013, vol. 720, no. 1-3, p. 32-51
Abstract A measurement of angular correlations in Drell–Yan lepton pairs via the ϕη* 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−Z/γ⁎→e+e− and Z/γ⁎→μ+μ−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 ϕη* 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 ϕη* 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.
Keywords Z bosonDifferential cross sectionPerturbative QCDEvent generatorsMonte Carlo models
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ATLAS COLLABORATION. Measurement of angular correlations in Drell–Yan lepton pairs to probe Z/γ* boson transverse momentum at √s=7 TeV with the ATLAS detector. In: Physics Letters. B, 2013, vol. 720, n° 1-3, p. 32-51. https://archive-ouverte.unige.ch/unige:38999

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Deposited on : 2014-07-29

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