Evidence for t\bartt\bart production in the multilepton final state in proton–proton collisions at \sqrts=13 \text TeV with the ATLAS detector

Franconi, Laura; Haug, Sigve; Weber, Michele; Anders, John Kenneth; Fehr, Armin; Beck, Hans Peter; Ereditato, Antonio; Chatterjee, Meghranjana; Lehmann, Niklaus; Miucci, Antonio; Weston, Thomas Daniel (2020). Evidence for t\bartt\bart production in the multilepton final state in proton–proton collisions at \sqrts=13 \text TeV with the ATLAS detector. The European physical journal. C, Particles and fields, 80(11) Springer 10.1140/epjc/s10052-020-08509-3

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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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