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Evidence for $t\bar{t}t\bar{t}$ production in the multilepton final state in proton-proton collisions at $\sqrt{s}$=13 TeV with the ATLAS detector

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arxiv 2007.14858 v3 pith:VRDKVZML submitted 2020-07-29 hep-ex

ATLAS Collaboration This is my paper · ORCID
classification hep-ex
keywords productionatlasdetectorevidencefour-top-quarkproton-protonusedbackground
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

A search is presented for four-top-quark production using an integrated luminosity of 139 fb$^{-1}$ of proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the LHC. Events are selected if they contain a same-sign lepton pair or at least three leptons (electrons or muons). Jet multiplicity, jet flavour and event kinematics are used to separate signal from the background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The four-top-quark production cross section is measured to be 24$^{+7}_{-6}$ fb. This corresponds to an observed (expected) significance with respect to the background-only hypothesis of 4.3 (2.4) standard deviations and provides evidence for this process.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Precision tests of third-generation four-quark operators: $gg \to h$ and $h \to \gamma \gamma$

    hep-ph 2025-07 conditional novelty 6.0 of 10

    Two-loop SMEFT corrections from third-generation four-quark operators to gg to h and h to gamma gamma are computed with full mass dependence, including new two-loop anomalous dimensions.

  2. Analysis of axion-like particles in a top-quark pair production at the CLIC

    hep-ph 2025-01 conditional novelty 6.0 of 10

    A simulation shows the CLIC gamma-gamma mode could exclude ALP-top couplings down to about 0.11 TeV^-1 for ALP masses near 10 GeV.

  3. Search for heavy neutral leptons in decays of W bosons produced in 13 TeV pp collisions using prompt signatures in the ATLAS detector

    hep-ex 2025-08 accept novelty 4.0 of 10

    The ATLAS search finds no evidence of heavy neutral leptons in W boson decays and sets the strongest limits to date on their mixing with electron and muon neutrinos in the 15-30 GeV mass range.

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