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Measurement of the charge asymmetry in highly boosted top-quark pair production in √s=8 TeV pp collision data collected by the ATLAS experiment

Aad, G; Abbott, B.; Abdinov, O; Abeloos, B; Aben, R; Abolins, M; Åkesson, Torsten LU ; Bocchetta, Simona LU ; Bryngemark, Lene LU and Doglioni, Caterina LU , et al. (2016) In Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 756. p.52-71
Abstract
In the pp→tt¯ process the angular distributions of top and anti-top quarks are expected to present a subtle difference, which could be enhanced by processes not included in the Standard Model. This Letter presents a measurement of the charge asymmetry in events where the top-quark pair is produced with a large invariant mass. The analysis is performed on 20.3 fb−1 of pp collision data at s=8TeV collected by the ATLAS experiment at the LHC, using reconstruction techniques specifically designed for the decay topology of highly boosted top quarks. The charge asymmetry in a fiducial region with large invariant mass of the top-quark pair (mtt¯>0.75 TeV) and an absolute rapidity difference of the top and anti-top quark candidates within... (More)
In the pp→tt¯ process the angular distributions of top and anti-top quarks are expected to present a subtle difference, which could be enhanced by processes not included in the Standard Model. This Letter presents a measurement of the charge asymmetry in events where the top-quark pair is produced with a large invariant mass. The analysis is performed on 20.3 fb−1 of pp collision data at s=8TeV collected by the ATLAS experiment at the LHC, using reconstruction techniques specifically designed for the decay topology of highly boosted top quarks. The charge asymmetry in a fiducial region with large invariant mass of the top-quark pair (mtt¯>0.75 TeV) and an absolute rapidity difference of the top and anti-top quark candidates within −2<|yt|−|yt¯|<2 is measured to be 4.2±3.2%, in agreement with the Standard Model prediction at next-to-leading order. A differential measurement in three tt¯ mass bins is also presented. © 2016 CERN for the benefit of the ATLAS Collaboration (Less)
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Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
756
pages
20 pages
publisher
Elsevier
external identifiers
  • scopus:85042466567
ISSN
0370-2693
DOI
10.1016/j.physletb.2016.02.055
language
English
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yes
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7459c645-3fbe-4b9a-a06e-0cfacf12a589
date added to LUP
2018-05-23 10:00:21
date last changed
2019-09-17 04:32:41
@article{7459c645-3fbe-4b9a-a06e-0cfacf12a589,
  abstract     = {In the pp→tt¯ process the angular distributions of top and anti-top quarks are expected to present a subtle difference, which could be enhanced by processes not included in the Standard Model. This Letter presents a measurement of the charge asymmetry in events where the top-quark pair is produced with a large invariant mass. The analysis is performed on 20.3 fb−1 of pp collision data at s=8TeV collected by the ATLAS experiment at the LHC, using reconstruction techniques specifically designed for the decay topology of highly boosted top quarks. The charge asymmetry in a fiducial region with large invariant mass of the top-quark pair (mtt¯&gt;0.75 TeV) and an absolute rapidity difference of the top and anti-top quark candidates within −2&lt;|yt|−|yt¯|&lt;2 is measured to be 4.2±3.2%, in agreement with the Standard Model prediction at next-to-leading order. A differential measurement in three tt¯ mass bins is also presented. © 2016 CERN for the benefit of the ATLAS Collaboration},
  author       = {Aad, G and Abbott, B. and Abdinov, O and Abeloos, B and Aben, R and Abolins, M and Åkesson, Torsten and Bocchetta, Simona and Bryngemark, Lene and Doglioni, Caterina and Floderus, Anders and Hawkins, Anthony and Hedberg, Vincent and Ivarsson, Jenny and Jarlskog, Göran and Lytken, Else and Mjörnmark, Ulf and Smirnova, Oxana and Viazlo, Oleksandr and , },
  issn         = {0370-2693},
  language     = {eng},
  pages        = {52--71},
  publisher    = {Elsevier},
  series       = {Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics},
  title        = {Measurement of the charge asymmetry in highly boosted top-quark pair production in √s=8 TeV pp collision data collected by the ATLAS experiment},
  url          = {http://dx.doi.org/10.1016/j.physletb.2016.02.055},
  volume       = {756},
  year         = {2016},
}