NLO QCD corrections to full off-shell production of $t\overline{t}Z$ including leptonic decays

Bevilacqua, Giuseppe; Hartanto, Heribertus Bayu; Kraus, Manfred; Nasufi, Jasmina; Worek, Malgorzata

doi:10.1007/jhep08(2022)060

Title: NLO QCD corrections to full off-shell production of $$t\overline{t}Z$$ including leptonic decays

Journal Article · 03 August 2022 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/jhep08(2022)060 · OSTI ID:1976506

Bevilacqua, Giuseppe ^[1]; Hartanto, Heribertus Bayu ^[2]; Kraus, Manfred ^[3]; Nasufi, Jasmina ^[4];

^[4]

University of Debrecen (Hungary); RWTH Aachen Univ. (Germany)
University of Cambridge (United Kingdom)
Florida State University, Tallahassee, FL (United States)
RWTH Aachen University (Germany)

Motivated by ongoing new physics searches in the top-quark sector at the Large Hadron Collider we report on the calculation of NLO QCD corrections to the Standard Model $pp$$→$$t\overline{t}Z + X$$ process in the tetra-lepton decay channel. This calculation is based on the matrix elements for the $$e^+v_eμ^-\bar v_μb\bar bτ^+τ^-$$ final state and includes all resonant and non-resonant Feynman diagrams, interferences and off-shell effects of the top quark as well as the W and Z gauge bosons. Also incorporated are photon-induced contributions. As it is customary for such studies, we show theoretical predictions for both fixed and dynamical factorisation and renormalisation scale choices and different PDF sets. Furthermore, we study the main theoretical uncertainties that are associated with neglected higher-order terms in the perturbative expansion and with the parameterisation of the PDF sets. In order to investigate the size of off-shell effects and higher-order corrections in top-quark decays, we perform a second computation for this process, which is based on the narrow-width-approximation where the top quarks, W and Z gauge bosons are kept on-shell. Results are given for the integrated and differential fiducial cross sections for the LHC Run II center-of-mass energy of 13 TeV.

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Research Organization:: Florida State University, Tallahassee, FL (United States)

Sponsoring Organization:: Bundesministerium für Bildung und Forschung (BMBF); European Research Council (ERC); German Research Foundation (DFG); National Research, Development and Innovation Office in Hungary; Science and Technology Facilities Council (STFC); USDOE Office of Science (SC)

Grant/Contract Number:: SC0010102

OSTI ID:: 1976506

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 8 Vol. 2022; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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Title: NLO QCD corrections to full off-shell production of $$t\overline{t}Z$$ including leptonic decays

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