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

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 (elect...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2020, Vol.80 (11)
Main Authors: Aad, G., Lund-Jensen, Bengt, Ohm, Christian, Ripellino, Giulia, Sidebo, P. Edvin, Strandberg, Jonas, Zwalinski, L.
Format: Article
Language:English
Online Access:Get full text
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Summary: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 24-6+7 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.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-020-08509-3