Measurement of the t¯tt¯t production cross section in pp collisions at √s = 13 TeV with the ATLAS detector

ATLAS Publications, S. Alderweireldt, T.M. Carter, A. Hasib, M.P. Heath, S. Palazzo, E.P. Takeva, N. Themistokleous, E.M. Villhauer

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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
Pages (from-to)1-52
Number of pages52
Journal Journal of High Energy Physics
Volume11
DOIs
Publication statusPublished - 16 Nov 2021

Keywords / Materials (for Non-textual outputs)

  • Hadron-Hadron scattering (experiments)
  • Top physics

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