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Evidence for the charge asymmetry in pp → tt¯ production at √s = 13 TeV with the ATLAS detector ATLAS Collaboration
Abstract
Inclusive and differential measurements of the top–antitop (tt¯) charge asymmetry Att¯ C and the leptonic asymmetry A``¯ C are presented in proton–proton collisions at √ s = 13 TeV recorded by the ATLAS experiment at the CERN Large Hadron Collider. The measurement uses the complete Run 2 dataset, corresponding to an integrated luminosity of 139 fb−1 , combines data in the single-lepton and dilepton channels, and employs reconstruction techniques adapted to both the resolved and boosted topologies. A Bayesian unfolding procedure is performed to correct for detector resolution and acceptance effects. The combined inclusive tt¯ charge asymmetry is measured to be Att¯ C = 0.0068 ± 0.0015, which differs from zero by 4.7 standard deviations. Differential measurements are performed as a function of the invariant mass, transverse momentum and longitudinal boost of the tt¯ system. Both the inclusive and differential measurements are found to be compatible with the Standard Model predictions, at next-to-next-to-leading order in quantum chromodynamics perturbation theory with next-to-leading-order electroweak corrections. The measurements are interpreted in the framework of the Standard Model effective field theory, placing competitive bounds on several Wilson coefficients.
Item Metadata
Title |
Evidence for the charge asymmetry in pp → tt¯ production at √s = 13 TeV with the ATLAS detector
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Creator | |
Publisher |
Springer Berlin Heidelberg
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Date Issued |
2023-08-16
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Description |
Inclusive and differential measurements of the top–antitop (tt¯) charge asymmetry Att¯
C
and the leptonic asymmetry A``¯
C
are presented in proton–proton collisions at
√
s = 13 TeV recorded by the ATLAS experiment at the CERN Large Hadron Collider.
The measurement uses the complete Run 2 dataset, corresponding to an integrated luminosity of 139 fb−1
, combines data in the single-lepton and dilepton channels, and employs
reconstruction techniques adapted to both the resolved and boosted topologies. A Bayesian
unfolding procedure is performed to correct for detector resolution and acceptance effects.
The combined inclusive tt¯ charge asymmetry is measured to be Att¯
C = 0.0068 ± 0.0015,
which differs from zero by 4.7 standard deviations. Differential measurements are performed as a function of the invariant mass, transverse momentum and longitudinal boost
of the tt¯ system. Both the inclusive and differential measurements are found to be compatible with the Standard Model predictions, at next-to-next-to-leading order in quantum
chromodynamics perturbation theory with next-to-leading-order electroweak corrections.
The measurements are interpreted in the framework of the Standard Model effective field
theory, placing competitive bounds on several Wilson coefficients.
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Subject | |
Genre | |
Type | |
Language |
eng
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Date Available |
2023-11-08
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution 4.0 International (CC BY 4.0)
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DOI |
10.14288/1.0437563
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URI | |
Affiliation | |
Citation |
Journal of High Energy Physics. 2023 Aug 16;2023(8):77
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Publisher DOI |
10.1007/JHEP08(2023)077
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Peer Review Status |
Reviewed
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Scholarly Level |
Faculty
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Copyright Holder |
The Author(s)
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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
Attribution 4.0 International (CC BY 4.0)