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Observation of four-top-quark production in the multilepton final state with the ATLAS detector ATLAS Collaboration
Abstract
This paper presents the observation of four-topquark (ttt¯ t ¯) production in proton-proton collisions at the LHC. The analysis is performed using an integrated luminosity of 140 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 ttt¯ t ¯signal with respect to the standard model (SM) background-only hypothesis is 6.1 (4.3) standard deviations. The ttt¯ t ¯ production cross section is measured to be 22.5+6.6 −5.5 fb, consistent with the SM prediction of 12.0 ± 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 ttt¯ t ¯production.
Item Metadata
Title |
Observation of four-top-quark production in the multilepton final state with the ATLAS detector
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Creator | |
Publisher |
Springer Berlin Heidelberg
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Date Issued |
2023-06-12
|
Description |
This paper presents the observation of four-topquark (ttt¯ t
¯) production in proton-proton collisions at the
LHC. The analysis is performed using an integrated luminosity of 140 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 ttt¯ t
¯signal with respect to the standard
model (SM) background-only hypothesis is 6.1 (4.3) standard deviations. The ttt¯ t
¯ production cross section is measured to be 22.5+6.6
−5.5 fb, consistent with the SM prediction of
12.0 ± 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 ttt¯ t
¯production.
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Genre | |
Type | |
Language |
eng
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Date Available |
2023-09-12
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution 4.0 International (CC BY 4.0)
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DOI |
10.14288/1.0435854
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URI | |
Affiliation | |
Citation |
The European Physical Journal C. 2023 Jun 12;83(6):496
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Publisher DOI |
10.1140/epjc/s10052-023-11573-0
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Peer Review Status |
Reviewed
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Scholarly Level |
Faculty; Researcher
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Copyright Holder |
The Author(s)
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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
Attribution 4.0 International (CC BY 4.0)