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Article
Report number arXiv:2208.12095 ; CERN-EP-2022-166
Title Evidence for the charge asymmetry in pptt¯ production at s=13 TeV with the ATLAS detector
Author(s) ATLAS Collaboration  Εμφάνιση και των 2935 συγγραφέων
Corporate Author(s) ATLAS Collaboration
Publication 2023-08-16
Imprint 26 Aug 2022
Number of pages 68
In: JHEP 2308 (2023) 077
DOI 10.1007/JHEP08(2023)077
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords top physics ; experimental results ; charge asymmetry
Abstract Inclusive and differential measurements of the top-antitop (tt¯) charge asymmetry ACtt¯ and the leptonic asymmetry AC¯ 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 fb1, 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 ACtt¯=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.
Related document supersedes: ATLAS-CONF-2019-026
Copyright/License Publication: © 2023-2025 CERN (License: CC-BY-4.0), sponsored by SCOAP³
Preprint: © 2022-2025 CERN (License: CC-BY-4.0)



Corresponding record in: Inspire
Email contact: tatjana.lenz@cern.ch


 Δημιουργία εγγραφής 2022-08-26, τελευταία τροποποίηση 2024-12-25


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