Measurements of the inclusive and differential production cross sections of a top-quark-antiquark pair in association with a Z boson at √s=13 TeV with the ATLAS detector



Aad, G, Abbott, B, Abbott, DC, Abud, A Abed, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2929 more authors) (2021) Measurements of the inclusive and differential production cross sections of a top-quark-antiquark pair in association with a Z boson at √s=13 TeV with the ATLAS detector EUROPEAN PHYSICAL JOURNAL C, 81 (8). 737-. ISSN 1434-6044, 1434-6052

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Abstract

Measurements of both the inclusive and differential production cross sections of a top-quark–antiquark pair in association with a Z boson (tt¯ Z) are presented. The measurements are performed by targeting final states with three or four isolated leptons (electrons or muons) and are based on s=13 TeV proton–proton collision data with an integrated luminosity of 139 fb - 1, recorded from 2015 to 2018 with the ATLAS detector at the CERN Large Hadron Collider. The inclusive cross section is measured to be σ<inf>t</inf><inf>t¯</inf><inf>Z</inf>= 0.99 ± 0.05 (stat.) ±0.08 (syst.) pb, in agreement with the most precise theoretical predictions. The differential measurements are presented as a function of a number of kinematic variables which probe the kinematics of the tt¯ Z system. Both absolute and normalised differential cross-section measurements are performed at particle and parton levels for specific fiducial volumes and are compared with theoretical predictions at different levels of precision, based on a χ2/ ndf and p value computation. Overall, good agreement is observed between the unfolded data and the predictions.

Item Type: Article
Additional Information: 60 pages in total, author list starting page 44, 15 figures, 9 tables, published in EPJC, Eur. Phys. J. C 81 (2021) 737. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2018-08
Uncontrolled Keywords: hep-ex, hep-ex
Divisions: Faculty of Science & Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 26 Aug 2021 07:39
Last Modified: 16 Jun 2026 13:05
DOI: 10.1140/epjc/s10052-021-09439-4
Open Access URL: https://link.springer.com/article/10.1140%2Fepjc%2...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3134798
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