Measurement of the transverse momentum and $\phi ^*_{\eta }$ distributions of Drell–Yan lepton pairs in proton–proton collisions at $\sqrt{s}=8$  TeV with the ATLAS detector

Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdinov, Ovsat; Aben, Rosemarie; Abolins, Maris; AbouZeid, Ossama; Abramowicz, Halina; Abreu, Henso; Abreu, Ricardo

doi:10.1140/epjc/s10052-016-4070-4

Measurement of the transverse momentum and $\phi ^*_{\eta }$ distributions of Drell–Yan lepton pairs in proton–proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

ATLAS

Collaboration

Dec 7, 2015

76 pages

Published in:

Eur.Phys.J.C 76 (2016) 5, 291

Published: May 23, 2016

e-Print:

1512.02192 [hep-ex]

DOI:

10.1140/epjc/s10052-016-4070-4

Report number:

CERN-PH-EP-2015-275

Experiments:

CERN-LHC-ATLAS

View in:

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reference search308 citations

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Abstract: (Springer)

Distributions of transverse momentum

p_T^{\ell \ell }

and the related angular variable

\phi ^*_\eta

of DrellΓÇôYan lepton pairs are measured in 20.3┬áfb

^{-1}

of protonΓÇôproton collisions at

\sqrt{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

\sqrt{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

\phi ^*_\eta < 1

the predictions from the Monte Carlo generator ResBos are generally consistent with the data within the theoretical uncertainties. However, at larger values of

\phi ^*_\eta

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

p_T^{\ell \ell }

while the fixed-order prediction of Dynnlo falls below the data at high values of

p_T^{\ell \ell }

. ResBos and the parton-shower Monte Carlo generators provide a much better description of the evolution of the

\phi ^*_\eta

and

p_T^{\ell \ell }

distributions as a function of lepton-pair mass and rapidity than the basic shape of the data.

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/

p p: scattering
p p: colliding beams
Z0: mass
numerical calculations: Monte Carlo
transverse momentum: momentum spectrum
lepton: pair production
ATLAS
quantum chromodynamics: perturbation theory
Drell-Yan process
CERN LHC Coll

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Figures(33)

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ATLAS uses a right-handed coordinate system with its origin at the nominal interaction point in the centre of the detector and the z-axis coinciding with the axis of the beam pipe. The x-axis points from the interaction point to the centre of the LHC ring, and the y-axis points upward. Cylindrical coordinates (r,φ) are used in the transverse plane, φ being the azimuthal angle around the beam pipe. The pseudorapidity is defined in terms of the polar angle θ as η = - ln tan(θ/2). The rapidity of a system, y, is defined in terms of its energy, E, and its longitudinal momentum, pz, as y = (1/2) ln[(E + pz)/(E - pz)]. Angular separations between particles or reconstructed objects are measured in η - φ space using ∆R = (∆η)2 + (∆φ)2

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