Measurement of the tt̅tt̅ production cross section in $pp$ collisions at √s = 13 TeV with the ATLAS detector

ATLAS Collaboration, Paul Newman

Research output: Contribution to journalArticlepeer-review

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+17−15 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+7−6 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.
Original languageEnglish
Article number118
Number of pages53
JournalJHEP
Volume2021
Issue number11
DOIs
Publication statusPublished - 16 Nov 2021

Bibliographical note

51 pages total, author list starting page 36, 12 figures, 3 tables, submitted to JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2020-10/

Keywords

  • hep-ex
  • Hadron-Hadron scattering (experiments)
  • Top physics

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