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

G Aad, Torsten Åkesson, Simona Bocchetta, Eric Edward Corrigan, Caterina Doglioni, Jannik Geisen, Kristian Gregersen, Eva Brottmann Hansen, Vincent Hedberg, Göran Jarlskog, Edgar Kellermann, Balazs Konya, Else Lytken, Katja Mankinen, Caterina Marcon, Ulf Mjörnmark, Geoffrey André Adrien Mullier, Ruth Pöttgen, Trine Poulsen, Eleni SkordaOxana Smirnova, L Zwalinski, ATLAS Collaboration

Research output: Contribution to journalArticlepeer-review

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 σtt¯Z= 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. © 2021, The Author(s).
Original languageEnglish
Article number737
JournalEuropean Physical Journal C
Volume81
Issue number8
DOIs
Publication statusPublished - 2021

Subject classification (UKÄ)

  • Subatomic Physics

Fingerprint

Dive into the research topics of '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'. Together they form a unique fingerprint.

Cite this