Measurement of the transverse momentum and φ *η distributions of Drell–Yan lepton pairs in proton–proton collisions at √s=8 TeV with the ATLAS detector

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (2016). Measurement of the transverse momentum and φ *η distributions of Drell–Yan lepton pairs in proton–proton collisions at √s=8 TeV with the ATLAS detector. European physical journal. C - particles and fields, 76(5) EDP Sciences 10.1140/epjc/s10052-016-4070-4

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Distributions of transverse momentum p ll T and the angular variable ϕ ∗ η of Drell--Yan lepton pairs are measured in 20.3 fb⁻¹ 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 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 generally the case. Monte Carlo generators based on the parton-shower approach are unable to describe the data over the full range of p ll T and the fixed-order prediction of DYNNLO falls below the data at high values of p ll T. ResBos and the parton-shower Monte Carlo generators provide a much better description of the evolution of the ϕ ∗ η and p ll T distributions as a function of lepton-pair mass and rapidity.

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