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

ATLAS Publications, Benjamin Wynne, T.M. Carter, M. Faucci Giannelli, A. Hasib, M.P. Heath, S. Palazzo, A. Søgaard, E.P. Takeva, A.J. Taylor, N. Themistokleous, E.M. Villhauer

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Abstract / Description of output

Measurements of both the inclusive and differential production cross sections of a top-quark–antiquark pair in association with a Z boson (t ¯t 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 σt ¯t 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 t ¯t 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.
Original languageEnglish
Article number737
Pages (from-to)1-43
Number of pages43
JournalThe European Physical Journal C
Volume81
Issue number8
DOIs
Publication statusPublished - 16 Aug 2021

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