Observation of four top quark production in proton-proton collisions at √s=13 TeV
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
The observation of the production of four top quarks in proton-proton collisions is reported, based on a data
sample collected by the CMS experiment at a center-of-mass energy of 13 TeV in 2016–2018 at the CERN LHC
and corresponding to an integrated luminosity of 138 fb−1. Events with two same-sign, three, or four charged
leptons (electrons and muons) and additional jets are analyzed. Compared to previous results in these channels,
updated identification techniques for charged leptons and jets originating from the hadronization of b quarks, as
well as a revised multivariate analysis strategy to distinguish the signal process from the main backgrounds, lead
to an improved expected signal significance of 4.9 standard deviations above the background-only hypothesis.
Four top quark production is observed with a significance of 5.6 standard deviations, and its cross section is
measured to be 17.7 +3.7−3.5 (stat) +2.3−1.9 (syst) fb, in agreement with the available standard model predictions.
sample collected by the CMS experiment at a center-of-mass energy of 13 TeV in 2016–2018 at the CERN LHC
and corresponding to an integrated luminosity of 138 fb−1. Events with two same-sign, three, or four charged
leptons (electrons and muons) and additional jets are analyzed. Compared to previous results in these channels,
updated identification techniques for charged leptons and jets originating from the hadronization of b quarks, as
well as a revised multivariate analysis strategy to distinguish the signal process from the main backgrounds, lead
to an improved expected signal significance of 4.9 standard deviations above the background-only hypothesis.
Four top quark production is observed with a significance of 5.6 standard deviations, and its cross section is
measured to be 17.7 +3.7−3.5 (stat) +2.3−1.9 (syst) fb, in agreement with the available standard model predictions.
Date Issued
2023-12-10
Date Acceptance
2023-10-25
Citation
Physics Letters B: Nuclear Physics and Particle Physics, 2023, 847
ISSN
0370-2693
Publisher
Elsevier
Journal / Book Title
Physics Letters B: Nuclear Physics and Particle Physics
Volume
847
Copyright Statement
© 2023 The Author(s). Published by Elsevier B.V. Funded by SCOAP³. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
License URL
Subjects
Astronomy & Astrophysics
CMS
DECAY
Physical Sciences
Physics
Physics, Nuclear
Physics, Particles & Fields
Science & Technology
SGLUONS
Top quark
Publication Status
Published
Article Number
ARTN 138290