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Measurements of top quark spin observables in tt¯ events using dilepton final states in √s=8 TeV pp collisions with the ATLAS detector

Aaboud, M; Aad, G; Abbott, B.; Abdallah, J; Abdinov, O; Abeloos, B; Åkesson, Torsten LU ; Bocchetta, Simona LU ; BRYNGEMARK, LENE LU and Doglioni, Caterina LU , et al. (2017) In Journal of High Energy Physics 2017(3).
Abstract
Measurements of top quark spin observables in tt¯ events are presented based on 20.2 fb−1 of s=8 TeV proton-proton collisions recorded with the ATLAS detector at the LHC. The analysis is performed in the dilepton final state, characterised by the presence of two isolated leptons (electrons or muons). There are 15 observables, each sensitive to a different coefficient of the spin density matrix of tt¯ production, which are measured independently. Ten of these observables are measured for the first time. All of them are corrected for detector resolution and acceptance effects back to the parton and stable-particle levels. The measured values of the observables at parton level are compared to Standard Model predictions at next-to-leading... (More)
Measurements of top quark spin observables in tt¯ events are presented based on 20.2 fb−1 of s=8 TeV proton-proton collisions recorded with the ATLAS detector at the LHC. The analysis is performed in the dilepton final state, characterised by the presence of two isolated leptons (electrons or muons). There are 15 observables, each sensitive to a different coefficient of the spin density matrix of tt¯ production, which are measured independently. Ten of these observables are measured for the first time. All of them are corrected for detector resolution and acceptance effects back to the parton and stable-particle levels. The measured values of the observables at parton level are compared to Standard Model predictions at next-to-leading order in QCD. The corrected distributions at stable-particle level are presented and the means of the distributions are compared to Monte Carlo predictions. No significant deviation from the Standard Model is observed for any observable.[Figure not available: see fulltext.] © 2017, The Author(s). (Less)
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keywords
Hadron-Hadron scattering (experiments)
in
Journal of High Energy Physics
volume
2017
issue
3
publisher
Springer
external identifiers
  • scopus:85016301579
ISSN
1126-6708
DOI
10.1007/JHEP03(2017)113
language
English
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yes
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29472ccb-2d04-4c73-a3c7-0d4ce80e61d5
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2017-06-13 12:45:29
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2018-01-07 12:07:19
@article{29472ccb-2d04-4c73-a3c7-0d4ce80e61d5,
  abstract     = {Measurements of top quark spin observables in tt¯ events are presented based on 20.2 fb−1 of s=8 TeV proton-proton collisions recorded with the ATLAS detector at the LHC. The analysis is performed in the dilepton final state, characterised by the presence of two isolated leptons (electrons or muons). There are 15 observables, each sensitive to a different coefficient of the spin density matrix of tt¯ production, which are measured independently. Ten of these observables are measured for the first time. All of them are corrected for detector resolution and acceptance effects back to the parton and stable-particle levels. The measured values of the observables at parton level are compared to Standard Model predictions at next-to-leading order in QCD. The corrected distributions at stable-particle level are presented and the means of the distributions are compared to Monte Carlo predictions. No significant deviation from the Standard Model is observed for any observable.[Figure not available: see fulltext.] © 2017, The Author(s).},
  articleno    = {113},
  author       = {Aaboud, M and Aad, G and Abbott, B. and Abdallah, J and Abdinov, O and Abeloos, B and Åkesson, Torsten and Bocchetta, Simona and BRYNGEMARK, LENE and Doglioni, Caterina and Hedberg, Vincent and Jarlskog, Göran and Lytken, Else and Mjörnmark, Ulf and Smirnova, Oxana and Viazlo, Oleksandr and , },
  issn         = {1126-6708},
  keyword      = {Hadron-Hadron scattering (experiments)},
  language     = {eng},
  number       = {3},
  publisher    = {Springer},
  series       = {Journal of High Energy Physics},
  title        = {Measurements of top quark spin observables in tt¯ events using dilepton final states in √s=8 TeV pp collisions with the ATLAS detector},
  url          = {http://dx.doi.org/10.1007/JHEP03(2017)113},
  volume       = {2017},
  year         = {2017},
}