Evidence for tttt production in the multilepton final state in proton-proton collisions at s=13 TeV with the ATLAS detector



Aad, G, Abbott, B, Abbott, DC, Abud, A, Abeling, K, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2945 more authors) (2020) Evidence for tttt production in the multilepton final state in proton-proton collisions at s=13 TeV with the ATLAS detector. EUROPEAN PHYSICAL JOURNAL C, 80 (11). 1085-.

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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.

Item Type: Article
Additional Information: 45 pages total, author list starting page 29, 7 figures, 4 tables, published in EPJC. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2018-05/
Uncontrolled Keywords: hep-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 14 Dec 2020 10:18
Last Modified: 16 May 2023 13:37
DOI: 10.1140/epjc/s10052-020-08509-3
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3110217