Abstract
Triggered by the observation of four top-quark production at the LHC by the ATLAS and CMS collaboration we report on the calculation of the next-to-leading order QCD corrections to the Standard Model process pp → \( t\overline{t}t\overline{t} \) in the 4ℓ top-quark decay channel. We take into account higher-order QCD effects in both the production and decays of the four top quarks. The latter effects are treated in the narrow width approximation, which preserves top-quark spin correlations throughout the calculation. We present results for two selected renormalisation and factorisation scale settings and three different PDF sets. Furthermore, we study the main theoretical uncertainties that are associated with the neglected higher-order terms in the perturbative expansion and with the parameterisation of the PDF sets. The results at the integrated and differential fiducial cross-section level are shown for the LHC Run III center-of-mass energy of \( \sqrt{s} \) = 13.6 TeV. Our findings are particularly relevant for precise measurements of the four top-quark fiducial cross sections and for the modelling of top-quark decays at the LHC.
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Acknowledgments
This work was supported by the German Research Foundation (Deutsche Forschungsgemeinschaft — DFG) under grant 396021762 — TRR 257: Particle Physics Phenomenology after the Higgs Discovery, and grant 400140256 — GRK 2497: The Physics of the Heaviest Particles at the LHC.
Furthermore, we acknowledge support by the Federal Ministry of Education and Research (Bundesministerium für Bildung und Forschung — BMBF) under grant BMBF-Projekt 05H21PACCA: Run 3 of CMS at the LHC: Theoretical studies of physics at particle accelerators.
The authors gratefully acknowledge the computing time provided to them at the NHR Center NHR4CES at RWTH Aachen University (project number p0020216). This is funded by the Federal Ministry of Education and Research, and the state governments participating on the basis of the resolutions of the GWK for national high performance computing at universities.
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Dimitrakopoulos, N., Worek, M. Four top final states with NLO accuracy in perturbative QCD: 4 lepton channel. J. High Energ. Phys. 2024, 129 (2024). https://doi.org/10.1007/JHEP06(2024)129
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DOI: https://doi.org/10.1007/JHEP06(2024)129