Evidence for tt¯tt¯ production in the multilepton final state in proton–proton collisions at s√=13 TeV with the ATLAS detector

Research output: Contribution to journalArticlepeer-review

  • External authors:
  • Agni Bethani
  • Brian Cox
  • Cinzia Da Via
  • Nicholas Dann
  • Alessandra Forti
  • Jiri Masik
  • Stephen Menary
  • Joleen Pater
  • Darren Price
  • Yang Qin
  • Savanna Shaw
  • Stephen Watts
  • Terence Wyatt
  • The ATLAS Collaboration

Abstract

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.

Bibliographical metadata

Original languageEnglish
Article number1085
JournalEuropean Physical Journal C. Particles and Fields
Volume80
Issue number11
DOIs
Publication statusPublished - 24 Nov 2020

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