Beck, H.P.; Chatterjee, M.; Ereditato, A.; Franconi, L.; Halser, L; Haug, S.; Ilg, A.; Müller, R.; O'Neill, A.P.; Schefer, M.M.; Weber, M.S. (2023). Evidence for the charge asymmetry in pp → tt̅ production at √s = 13 TeV with the ATLAS detector. Journal of High Energy Physics, 2023(8) Springer 10.1007/JHEP08(2023)077
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Inclusive and differential measurements of the top–antitop (tt̅) charge asymmetry Att̅C and the leptonic asymmetry Al¯lC 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 t¯t charge asymmetry is measured to be Att̅C = 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 t¯t 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 Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP) 10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC) |
UniBE Contributor: |
Beck, Hans Peter, Chatterjee, Meghranjana, Ereditato, Antonio, Franconi, Laura, Halser, Lea, Haug, Sigve, Ilg, Armin, Müller, Roman, O'Neill, Aaron Paul, Schefer, Meinrad Moritz, Weber, Michele |
Subjects: |
500 Science > 530 Physics |
ISSN: |
1029-8479 |
Publisher: |
Springer |
Language: |
English |
Submitter: |
BORIS Import LHEP |
Date Deposited: |
14 Feb 2024 09:51 |
Last Modified: |
30 Jun 2024 02:23 |
Publisher DOI: |
10.1007/JHEP08(2023)077 |
Additional Information: |
Kollaboration - Es sind nur die Berner Autor*innen namentlich erwaehnt; the ATLAS collaboration |
Uncontrolled Keywords: |
Hadron-Hadron Scattering, Top Physics |
BORIS DOI: |
10.48350/191903 |
URI: |
https://boris.unibe.ch/id/eprint/191903 |
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