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

ATLAS Publications; T.M. Carter; M. Faucci Giannelli; A. Hasib; M.P. Heath; S. Palazzo; A. Søgaard; E.P. Takeva; A.J. Taylor; N. Themistokleous; E.M. Villhauer

doi:10.1140/epjc/s10052-020-08509-3

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

ATLAS Publications, T.M. Carter, M. Faucci Giannelli, A. Hasib, M.P. Heath, S. Palazzo, A. Søgaard, E.P. Takeva, A.J. Taylor, N. Themistokleous, E.M. Villhauer

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

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 evi-
dence for this process.

Original language	English
Article number	1085
Pages (from-to)	1-32
Number of pages	32
Journal	The European Physical Journal C
Volume	80
Issue number	11
DOIs	https://doi.org/10.1140/epjc/s10052-020-08509-3
Publication status	Published - 24 Nov 2020

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10.1140/epjc/s10052-020-08509-3Licence: Creative Commons: Attribution (CC-BY)

http://arxiv.org/abs/2007.14858

3 Finished
3 Active

Upgrade of the ATLAS detector at the LHC (2023-26)
Clark, P.
1/04/23 → 31/03/26
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C.
1/04/23 → 30/09/25
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C.
1/10/22 → 30/09/25
Project: Research

Cite this

ATLAS Publications, Carter, T. M., Faucci Giannelli, M., Hasib, A., Heath, M. P., Palazzo, S., Søgaard, A., Takeva, E. P., Taylor, A. J., Themistokleous, N., & Villhauer, E. M. (2020). Evidence for t ¯t t ¯t production in the multilepton final state in proton–proton collisions at √s = 13 TeV with the ATLAS detector. The European Physical Journal C, 80(11), 1-32. Article 1085. https://doi.org/10.1140/epjc/s10052-020-08509-3

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

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 areselected 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 evi-dence for this process.",

author = "{ATLAS Publications} and Clark, {Philip James} and Sinead Farrington and Yanyan Gao and Christos Leonidopoulos and Martin, {Victoria Jane} and Liza Mijovic and Benjamin Wynne and T.M. Carter and {Faucci Giannelli}, M. and A. Hasib and M.P. Heath and S. Palazzo and A. S{\o}gaard and E.P. Takeva and A.J. Taylor and N. Themistokleous and E.M. Villhauer",

year = "2020",

month = nov,

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doi = "10.1140/epjc/s10052-020-08509-3",

language = "English",

volume = "80",

pages = "1--32",

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ATLAS Publications, Carter, TM, Faucci Giannelli, M, Hasib, A, Heath, MP, Palazzo, S, Søgaard, A, Takeva, EP, Taylor, AJ, Themistokleous, N & Villhauer, EM 2020, 'Evidence for t ¯t t ¯t production in the multilepton final state in proton–proton collisions at √s = 13 TeV with the ATLAS detector', The European Physical Journal C, vol. 80, no. 11, 1085, pp. 1-32. https://doi.org/10.1140/epjc/s10052-020-08509-3

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T1 - Evidence for t ¯t t ¯t production in the multilepton final state in proton–proton collisions at √s = 13 TeV with the ATLAS detector

AU - ATLAS Publications

AU - Clark, Philip James

AU - Farrington, Sinead

AU - Gao, Yanyan

AU - Leonidopoulos, Christos

AU - Martin, Victoria Jane

AU - Mijovic, Liza

AU - Wynne, Benjamin

AU - Carter, T.M.

AU - Faucci Giannelli, M.

AU - Hasib, A.

AU - Heath, M.P.

AU - Palazzo, S.

AU - Søgaard, A.

AU - Takeva, E.P.

AU - Taylor, A.J.

AU - Themistokleous, N.

AU - Villhauer, E.M.

PY - 2020/11/24

Y1 - 2020/11/24

N2 - 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 areselected 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 evi-dence for this process.

AB - 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 areselected 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 evi-dence for this process.

U2 - 10.1140/epjc/s10052-020-08509-3

DO - 10.1140/epjc/s10052-020-08509-3

M3 - Article

SN - 1434-6052

VL - 80

SP - 1

EP - 32

JO - The European Physical Journal C

JF - The European Physical Journal C

IS - 11

M1 - 1085

ER -

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

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Projects

Upgrade of the ATLAS detector at the LHC (2023-26)

Experimental Particle Physics at the University of Edinburgh

Experimental Particle Physics at the University of Edinburgh

Cite this