Home > Research > Publications & Outputs > Observation of four-top-quark production in the...

Research

Associated organisational unit

Links

Text available via DOI:

View graph of relations

Observation of four-top-quark production in the multilepton final state with the ATLAS detector

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Published

Standard

Observation of four-top-quark production in the multilepton final state with the ATLAS detector. / ATLAS Collaboration.
In: European Physical Journal C: Particles and Fields, Vol. 83, No. 6, 496, 12.06.2023.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

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, vol. 83, no. 6, 496. https://doi.org/10.1140/epjc/s10052-023-11573-0

APA

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(6), Article 496. https://doi.org/10.1140/epjc/s10052-023-11573-0

Vancouver

ATLAS Collaboration. Observation of four-top-quark production in the multilepton final state with the ATLAS detector. European Physical Journal C: Particles and Fields. 2023 Jun 12;83(6):496. doi: 10.1140/epjc/s10052-023-11573-0

Author

ATLAS Collaboration. / Observation of four-top-quark production in the multilepton final state with the ATLAS detector. In: European Physical Journal C: Particles and Fields. 2023 ; Vol. 83, No. 6.

Bibtex

@article{08a877fddb824795be3803e8620887f7,
title = "Observation of four-top-quark production in the multilepton final state with the ATLAS detector",
abstract = "This paper presents the observation of four-top-quark (tt¯tt¯) 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 tt¯tt¯ signal with respect to the standard model (SM) background-only hypothesis is 6.1 (4.3) standard deviations. The tt¯tt¯ production cross section is measured to be 22.5-5.5+6.6 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 tt¯tt¯ production.",
author = "{ATLAS Collaboration} and A.E. Barton and I.A. Bertram and G. Borissov and E.V. Bouhova-Thacker and R.A.M. Ferguson and James Ferrando and H. Fox and R.C.W. Henderson and R.W.L. Jones and V. Kartvelishvili and P.A. Love and E.J. Marshall and L. Meng and D. Muenstermann and N. Ribaric and K. Rybacki and M. Smizanska and S. Spinali and A.M. Wharton",
year = "2023",
month = jun,
day = "12",
doi = "10.1140/epjc/s10052-023-11573-0",
language = "English",
volume = "83",
journal = "European Physical Journal C: Particles and Fields",
issn = "1434-6044",
publisher = "SPRINGER",
number = "6",

}

RIS

TY - JOUR

T1 - Observation of four-top-quark production in the multilepton final state with the ATLAS detector

AU - ATLAS Collaboration

AU - Barton, A.E.

AU - Bertram, I.A.

AU - Borissov, G.

AU - Bouhova-Thacker, E.V.

AU - Ferguson, R.A.M.

AU - Ferrando, James

AU - Fox, H.

AU - Henderson, R.C.W.

AU - Jones, R.W.L.

AU - Kartvelishvili, V.

AU - Love, P.A.

AU - Marshall, E.J.

AU - Meng, L.

AU - Muenstermann, D.

AU - Ribaric, N.

AU - Rybacki, K.

AU - Smizanska, M.

AU - Spinali, S.

AU - Wharton, A.M.

PY - 2023/6/12

Y1 - 2023/6/12

N2 - This paper presents the observation of four-top-quark (tt¯tt¯) 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 tt¯tt¯ signal with respect to the standard model (SM) background-only hypothesis is 6.1 (4.3) standard deviations. The tt¯tt¯ production cross section is measured to be 22.5-5.5+6.6 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 tt¯tt¯ production.

AB - This paper presents the observation of four-top-quark (tt¯tt¯) 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 tt¯tt¯ signal with respect to the standard model (SM) background-only hypothesis is 6.1 (4.3) standard deviations. The tt¯tt¯ production cross section is measured to be 22.5-5.5+6.6 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 tt¯tt¯ production.

U2 - 10.1140/epjc/s10052-023-11573-0

DO - 10.1140/epjc/s10052-023-11573-0

M3 - Journal article

VL - 83

JO - European Physical Journal C: Particles and Fields

JF - European Physical Journal C: Particles and Fields

SN - 1434-6044

IS - 6

M1 - 496

ER -