Measurement of the t(t)over-bart(t)over-bar production cross section in pp collisions at √s=13 TeV with the ATLAS detector



Aad, G, Abbott, B, Abbott, DC, Abud, A Abed, Abeling, K, Abhayasinghe, DK, Abidi, SH, Abramowicz, H, Abreu, H, Abulaiti, Y
et al (show 2859 more authors) (2021) Measurement of the t(t)over-bart(t)over-bar production cross section in pp collisions at √s=13 TeV with the ATLAS detector JOURNAL OF HIGH ENERGY PHYSICS, 2021 (11). 118-. ISSN 1126-6708, 1029-8479

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Abstract

A measurement of four-top-quark production using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the Large Hadron Collider corresponding to an integrated luminosity of 139 fb−1 is presented. Events are selected if they contain a single lepton (electron or muon) or an opposite-sign lepton pair, in association with multiple jets. The events are categorised according to the number of jets and how likely these are to contain b-hadrons. A multivariate technique is then used to discriminate between signal and background events. The measured four-top-quark production cross section is found to be 26−15+17 fb, with a corresponding observed (expected) significance of 1.9 (1.0) standard deviations over the background-only hypothesis. The result is combined with the previous measurement performed by the ATLAS Collaboration in the multilepton final state. The combined four-top-quark production cross section is measured to be 24−6+7 fb, with a corresponding observed (expected) signal significance of 4.7 (2.6) standard deviations over the background-only predictions. It is consistent within 2.0 standard deviations with the Standard Model expectation of 12.0 ± 2.4 fb. [Figure not available: see fulltext.].

Item Type: Article
Uncontrolled Keywords: Hadron-Hadron scattering (experiments), Top physics
Divisions: Faculty of Science & Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 12 Jan 2022 16:17
Last Modified: 23 May 2026 06:28
DOI: 10.1007/JHEP11(2021)118
Open Access URL: https://link.springer.com/article/10.1007%2FJHEP11...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3146238
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