Report

PUBDB-2025-05790

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png ATLAS projected sensitivities for for the cross-section measurement and new physics searches in four-top-quark production at the HL-LHC

ATLAS Collaboration (Collaboration author)DESY*

2025

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Please use a persistent id in citations: doi:10.3204/PUBDB-2025-05790

Report No.: ATL-PHYS-PUB-2025-017

Abstract: This note presents projections for the study of four-top-quark production ($pp \to t\bar{t}t\bar{t}$) at the High-Luminosity LHC (HL-LHC) using a dataset of up to 3~ab$^{-1}$ at $\sqrt{s} = 14$~TeV. Two scenarios are explored to extrapolate theoretical and experimental systematic uncertainties from the current ATLAS measurement at 140~fb$^{-1}$. Sensitivity to the standard model cross section is evaluated, along with constraints on the top-quark Yukawa coupling and limits on Effective Field Theory operators. In addition, the search sensitivities to various heavy-resonance particles mediating $t\bar{t}t\bar{t}$ production are estimated. In the optimistic scenario, the expected uncertainty in the four-top production cross section is projected to be $6\%$, while the $95\%$ confidence level upper limits on production cross-sections drop below 1~fb for heavy resonances with masses around or above 1~TeV.

Keyword(s): Top ; Exotics ; TOP

Note: All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PUBNOTES/ATL-PHYS-PUB-2025-017. The authors list may be incomplete!

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Contributing Institute(s):

1. LHC/ATLAS Experiment (ATLAS)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)

Experiment(s):

1. LHC: ATLAS

Appears in the scientific report 2025

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Database coverage:
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