Measurement of the angular coefficients in Z-boson events using electron and muon pairs from data taken at √s = 8 TeV with the ATLAS detector

G Aad; B Abbott; J Abdallah; O Abdinov; B Abeloos; R Aben; Torsten Åkesson; Simona Bocchetta; LENE Bryngemark; Caterina Doglioni; Anders Floderus; Vincent Hedberg; Göran Jarlskog; Else Lytken; Ulf Mjörnmark; Oxana Smirnova; Oleksandr Viazlo; ATLAS Collaboration

doi:10.1007/JHEP08(2016)159

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Measurement of the angular coefficients in Z-boson events using electron and muon pairs from data taken at √s = 8 TeV with the ATLAS detector

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Measurement of the angular coefficients in Z-boson events using electron and muon pairs from data taken at √s = 8 TeV with the ATLAS detector

G Aad, B Abbott, J Abdallah, O Abdinov, B Abeloos, R Aben, Torsten Åkesson, Simona Bocchetta, LENE Bryngemark, Caterina Doglioni, …

The journal of high energy physics, Vol.2016(8), 159

2016

DOI: 10.1007/JHEP08(2016)159

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Abstract

The angular distributions of Drell-Yan charged lepton pairs in the vicinity of the Z-boson mass peak probe the underlying QCD dynamics of Z-boson production. This paper presents a measurement of the complete set of angular coefficients A0−7 describing these distributions in the Z-boson Collins-Soper frame. The data analysed correspond to 20.3 fb−1 of pp collisions at s=8 TeV, collected by the ATLAS detector at the CERN LHC. The measurements are compared to the most precise fixed-order calculations currently available (O(αs2)) and with theoretical predictions embedded in Monte Carlo generators. The measurements are precise enough to probe QCD corrections beyond the formal accuracy of these calculations and to provide discrimination between different parton-shower models. A significant deviation from the (O(αs2)) predictions is observed for A0 − A2. Evidence is found for non-zero A5,6,7, consistent with expectations.[Figure not available: see fulltext.] © 2016, The Author(s).

Natural Sciences

Physical Sciences

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Hadron-Hadron scattering (experiments)

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Subatomic Physics

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Title: Subtitle: Measurement of the angular coefficients in Z-boson events using electron and muon pairs from data taken at √s = 8 TeV with the ATLAS detector
Creators: G Aad - Aix-Marseille Université
B Abbott - University of Oklahoma
J Abdallah - University of Iowa
O Abdinov - Azerbaijan National Academy of Sciences
B Abeloos - Université Paris-Saclay
R Aben - University of Amsterdam
Torsten Åkesson - Particle Physics
Simona Bocchetta - Lund University
LENE Bryngemark - Particle Physics
Caterina Doglioni - Particle Physics
Anders Floderus - Particle Physics
Vincent Hedberg - Particle Physics
Göran Jarlskog - Particle Physics
Else Lytken - Particle Physics
Ulf Mjörnmark - Particle Physics
Oxana Smirnova - Particle Physics
Oleksandr Viazlo - Particle Physics
ATLAS Collaboration
Contributors: U Mallik (Contributor) - University of Iowa, Physics and Astronomy
Resource Type: Journal article
Publication Details: The journal of high energy physics, Vol.2016(8), 159
DOI: 10.1007/JHEP08(2016)159
ISSN: 1029-8479
eISSN: 1029-8479
Language: English
Date published: 2016
Academic Unit: Physics and Astronomy
Record Identifier: 9984199701602771

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