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

Allbrooke, Benedict, Asquith, Lily, Cerri, Alessandro, Chavez Barajas, Carlos, De Santo, Antonella, Potter, Tina, Salvatore, Fabrizio, Santoyo Castillo, Itzebelt, Suruliz, Kerim, Sutton, Mark, Vivarelli, Iacopo and The ATLAS Collaboration, et al (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). a291. ISSN 1434-6044

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Abstract

Distributions of transverse momentum ℓℓpT and the related angular variable φ∗η of DrellÇôYan lepton pairs are measured in 20.3 fbáfb−1 of proton–proton 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 proton–proton collisions at √s = 7┬á7 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 the case. Monte Carlo generators based on the parton-shower approach are unable to describe the data over the full range of ℓℓp┬ while the fixed-order prediction of Dynnlo falls below the data at high values of ℓℓp┬. ResBos and the parton-shower Monte Carlo generators provide a much better description of the evolution of the φ∗η and ℓℓp┬ distributions as a function of lepton-pair mass and rapidity than the basic shape of the data.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Richard Chambers
Date Deposited: 20 Jun 2016 16:00
Last Modified: 17 Jun 2017 00:44
URI: http://sro.sussex.ac.uk/id/eprint/61620

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