NLO QCD corrections to full off-shell production of $$t\overline{t}Z$$ including leptonic decays
Abstract
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.
- Authors:
-
[4]
- University of Debrecen (Hungary)
- University of Cambridge (United Kingdom)
- Florida State University, Tallahassee, FL (United States)
- RWTH Aachen University (Germany)
- Publication Date:
- Research Org.:
- Florida State Univ., Tallahassee, FL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); German Research Foundation (DFG); Bundesministerium für Bildung und Forschung (BMBF); National Research, Development and Innovation Office in Hungary; European Research Council (ERC); Science and Technology Facilities Council (STFC)
- OSTI Identifier:
- 1976506
- Grant/Contract Number:
- SC0010102; 396021762-TRR 257; 400140256-GRK 2497; K 125105; 683211; ST/T000694/1
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of High Energy Physics (Online)
- Additional Journal Information:
- Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2022; Journal Issue: 8; Journal ID: ISSN 1029-8479
- Publisher:
- Springer Nature
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; higher-order perturbative calculations, top quark
Citation Formats
Bevilacqua, Giuseppe, Hartanto, Heribertus Bayu, Kraus, Manfred, Nasufi, Jasmina, and Worek, Malgorzata. NLO QCD corrections to full off-shell production of $t\overline{t}Z$ including leptonic decays. United States: N. p., 2022.
Web. doi:10.1007/jhep08(2022)060.
Bevilacqua, Giuseppe, Hartanto, Heribertus Bayu, Kraus, Manfred, Nasufi, Jasmina, & Worek, Malgorzata. NLO QCD corrections to full off-shell production of $t\overline{t}Z$ including leptonic decays. United States. https://doi.org/10.1007/jhep08(2022)060
Bevilacqua, Giuseppe, Hartanto, Heribertus Bayu, Kraus, Manfred, Nasufi, Jasmina, and Worek, Malgorzata. Wed .
"NLO QCD corrections to full off-shell production of $t\overline{t}Z$ including leptonic decays". United States. https://doi.org/10.1007/jhep08(2022)060. https://www.osti.gov/servlets/purl/1976506.
@article{osti_1976506,
title = {NLO QCD corrections to full off-shell production of $t\overline{t}Z$ including leptonic decays},
author = {Bevilacqua, Giuseppe and Hartanto, Heribertus Bayu and Kraus, Manfred and Nasufi, Jasmina and Worek, Malgorzata},
abstractNote = {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.},
doi = {10.1007/jhep08(2022)060},
journal = {Journal of High Energy Physics (Online)},
number = 8,
volume = 2022,
place = {United States},
year = {Wed Aug 03 00:00:00 EDT 2022},
month = {Wed Aug 03 00:00:00 EDT 2022}
}
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