Butterworth, Jonathan; ATLAS, Collaboration; (2023) Observation of four-top-quark production in the multilepton final state with the ATLAS detector. European Physical Journal C: Particles and Fields , 83 , Article 496. 10.1140/epjc/s10052-023-11573-0.

Preview

Text s10052-023-11573-0.pdf - Published Version Download (4MB) | Preview

Abstract

This paper presents the observation of four-top-quark (t\bar{t}t\bar{t}) production in proton-proton collisions at the LHC. The analysis is performed using an integrated luminosity of 140 \hbox {fb}^{-1} at a centre-of-mass energy of 13 TeV collected using the ATLAS detector. Events containing two leptons with the same electric charge or at least three leptons (electrons or muons) are selected. Event kinematics are used to separate signal from background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The observed (expected) significance of the measured t\bar{t}t\bar{t} signal with respect to the standard model (SM) background-only hypothesis is 6.1 (4.3) standard deviations. The t\bar{t}t\bar{t} production cross section is measured to be 22.5^{+6.6}_{-5.5} fb, consistent with the SM prediction of 12.0 \pm 2.4 fb within 1.8 standard deviations. Data are also used to set limits on the three-top-quark production cross section, being an irreducible background not measured previously, and to constrain the top-Higgs Yukawa coupling and effective field theory operator coefficients that affect t\bar{t}t\bar{t} production.

Download activity - last month

Export as CSVXMLJSON

Download activity - last 12 months

Export as JSONXMLCSV

Downloads by country - last 12 months

Export as JSONXMLCSV

Archive Staff Only

View Item