Measurement of the transverse momentum and ϕη<inf>∗</inf> distributions of Drell–Yan lepton pairs in proton–proton collisions at √ s = 7 TeV with the ATLAS detector



Atlas, C, Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Aben, R, Abolins, M, AbouZeid, OS, Abramowicz, H, Abreu, H
et al (show 75 more authors) (2016) Measurement of the transverse momentum and ϕη<inf>∗</inf> distributions of Drell–Yan lepton pairs in proton–proton collisions at √ s = 7 TeV with the ATLAS detector. European Physical Journal C, 76 (5).

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Abstract

Distributions of transverse momentum pℓℓT and the related angular variable ϕ∗η of DrellΓÇôYan lepton pairs are measured in 20.3┬áfb−1 of protonΓÇôproton collisions at s√=8┬áTeV 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 protonΓÇôproton collisions at s√=7┬áTeV, 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 ϕ∗η<1 the predictions from the Monte Carlo generator RESBOS are generally consistent with the data within the theoretical uncertainties. However, at larger values of ϕ∗η this is not the case. Monte Carlo generators based on the parton-shower approach are unable to describe the data over the full range of pℓℓT while the fixed-order prediction of DYNNLO falls below the data at high values of pℓℓT. RESBOS and the parton-shower Monte Carlo generators provide a much better description of the evolution of the ϕ∗η and pℓℓT distributions as a function of lepton-pair mass and rapidity than the basic shape of the data.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 14 Oct 2016 08:09
Last Modified: 11 May 2021 07:58
DOI: 10.1140/epjc/s10052-016-4070-4
Open Access URL: https://arxiv.org/abs/1512.02192
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3003763