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Article
Report number arXiv:1512.02192 ; CERN-PH-EP-2015-275 ; CERN-PH-EP-2015-275
Title Measurement of the transverse momentum and ϕη distributions of Drell--Yan lepton pairs in proton--proton collisions at s=8 TeV with the ATLAS detector
Related titleMeasurement of the transverse momentum and ϕη distributions of Drell-Yan lepton pairs in proton-proton collisions at s=8 TeV with the ATLAS detector
Author(s) ATLAS Collaboration  Показать всех 2870 авторов
Publication 2016-05-23
Imprint 07 Dec 2015
Number of pages 76
Note 60 pages plus author list (77 pages total), 18 figures, 31 tables, submitted to EPJC, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2014-12/
In: Eur. Phys. J. C 76 (2016) 291
DOI 10.1140/epjc/s10052-016-4070-4
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords electroweak interaction ; QCD ; lepton production ; particle and resonance production ; experimental results
Abstract Distributions of transverse momentum pTll and the angular variable ϕη of Drell--Yan lepton pairs are measured in 20.3 fb1 of proton--proton collisions at s=8 TeV with the ATLAS detector at the LHC. Measurements in electron-pair and muon-pair final states are corrected for detector effects and combined. Compared to previous measurements in proton--proton collisions at s=7 TeV, these new measurements benefit from a larger data sample and improved control of systematic uncertainties. Measurements are performed in bins of lepton-pair mass above, around and below the Z-boson mass peak. The data are compared to predictions from perturbative and resummed QCD calculations. For values of ϕη<1 the predictions from the Monte Carlo generator ResBos are generally consistent with the data within the theoretical uncertainties. However, at larger values of ϕη this is not generally the case. Monte Carlo generators based on the parton-shower approach are unable to describe the data over the full range of pTll and the fixed-order prediction of DYNNLO falls below the data at high values of pTll. ResBos and the parton-shower Monte Carlo generators provide a much better description of the evolution of the ϕη and pTll distributions as a function of lepton-pair mass and rapidity.
Copyright/License publication: © 2016-2024 CERN (License: CC-BY-4.0), sponsored by SCOAP³
preprint: © 2015-2024 CERN (License: CC-BY-4.0)



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