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

Agni Bethani; Brian Cox; Cinzia Da Via; Nicholas Dann; Alessandra Forti; Frederick Loebinger; Jiri Masik; Stephen Menary; Francisca Munoz Sanchez; Alexander Oh; Joleen Pater; Yvonne Peters; Andrew Pilkington; Darren Price; Yang Qin; Savanna Shaw; Stephen Watts; Terence Wyatt; The ATLAS Collaboration

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

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

Agni Bethani, Brian Cox, Cinzia Da Via, Nicholas Dann, Alessandra Forti, Frederick Loebinger, Jiri Masik, Stephen Menary, Francisca Munoz Sanchez, Alexander Oh, Joleen Pater, Yvonne Peters, Andrew Pilkington, Darren Price, Yang Qin, Savanna Shaw, Stephen Watts, Terence Wyatt, The ATLAS Collaboration

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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 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 evidence for this process.

Original language	English
Article number	1085
Journal	European Physical Journal C. Particles and Fields
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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Bethani, A., Cox, B., Da Via, C., Dann, N., Forti, A., Loebinger, F., Masik, J., Menary, S., Munoz Sanchez, F., Oh, A., Pater, J., Peters, Y., Pilkington, A., Price, D., Qin, Y., Shaw, S., Watts, S., Wyatt, T., & The ATLAS Collaboration (2020). Evidence for tt¯tt¯ production in the multilepton final state in proton–proton collisions at s√=13 TeV with the ATLAS detector. European Physical Journal C. Particles and Fields, 80(11), Article 1085. https://doi.org/10.1140/epjc/s10052-020-08509-3

@article{f98dde0ec537406ab0489f11b0957b10,

title = "Evidence for tt¯tt¯ 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 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 evidence for this process.",

author = "Agni Bethani and Brian Cox and {Da Via}, Cinzia and Nicholas Dann and Alessandra Forti and Frederick Loebinger and Jiri Masik and Stephen Menary and {Munoz Sanchez}, Francisca and Alexander Oh and Joleen Pater and Yvonne Peters and Andrew Pilkington and Darren Price and Yang Qin and Savanna Shaw and Stephen Watts and Terence Wyatt and {The ATLAS Collaboration}",

note = "Funding Information: We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; ANID, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS and CEA-DRF/IRFU, France; SRNSFG, Georgia; BMBF, HGF and MPG, Germany; GSRT, Greece; RGC and Hong Kong SAR, China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russia Federation; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZ{\v S}, Slovenia; DST/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, UK; DOE and NSF, USA. In addition, individual groups and members have received support from BCKDF, CANARIE, Compute Canada and CRC, Canada; ERC, ERDF, Horizon 2020, Marie Sk{\l}odowska-Curie Actions and COST, European Union; Investissements d{\textquoteright}Avenir Labex, Investissements d{\textquoteright}Avenir Idex and ANR, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF, Greece; BSF-NSF and GIF, Israel; La Caixa Banking Foundation, CERCA Programme Generalitat de Catalunya and PROMETEO and GenT Programmes Generalitat Valenciana, Spain; G{\"o}ran Gustafssons Stiftelse, Sweden; The Royal Society and Leverhulme Trust, UK. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN, the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA), the Tier-2 facilities worldwide and large non-WLCG resource providers. Major contributors of computing resources are listed in Ref. []. Publisher Copyright: {\textcopyright} 2020, CERN for the benefit of the ATLAS collaboration. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.",

year = "2020",

month = nov,

day = "24",

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

language = "English",

volume = "80",

journal = "European Physical Journal C. Particles and Fields",

issn = "1434-6044",

publisher = "Springer Nature",

number = "11",

}

Bethani, A, Cox, B, Da Via, C, Dann, N, Forti, A, Loebinger, F, Masik, J, Menary, S, Munoz Sanchez, F , Oh, A, Pater, J, Peters, Y , Pilkington, A , Price, D, Qin, Y, Shaw, S, Watts, S, Wyatt, T & The ATLAS Collaboration 2020, 'Evidence for tt¯tt¯ production in the multilepton final state in proton–proton collisions at s√=13 TeV with the ATLAS detector', European Physical Journal C. Particles and Fields, vol. 80, no. 11, 1085. https://doi.org/10.1140/epjc/s10052-020-08509-3

TY - JOUR

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

AU - Bethani, Agni

AU - Cox, Brian

AU - Da Via, Cinzia

AU - Dann, Nicholas

AU - Forti, Alessandra

AU - Loebinger, Frederick

AU - Masik, Jiri

AU - Menary, Stephen

AU - Munoz Sanchez, Francisca

AU - Oh, Alexander

AU - Pater, Joleen

AU - Peters, Yvonne

AU - Pilkington, Andrew

AU - Price, Darren

AU - Qin, Yang

AU - Shaw, Savanna

AU - Watts, Stephen

AU - Wyatt, Terence

AU - The ATLAS Collaboration,

N1 - Funding Information: We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; ANID, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS and CEA-DRF/IRFU, France; SRNSFG, Georgia; BMBF, HGF and MPG, Germany; GSRT, Greece; RGC and Hong Kong SAR, China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russia Federation; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZŠ, Slovenia; DST/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, UK; DOE and NSF, USA. In addition, individual groups and members have received support from BCKDF, CANARIE, Compute Canada and CRC, Canada; ERC, ERDF, Horizon 2020, Marie Skłodowska-Curie Actions and COST, European Union; Investissements d’Avenir Labex, Investissements d’Avenir Idex and ANR, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF, Greece; BSF-NSF and GIF, Israel; La Caixa Banking Foundation, CERCA Programme Generalitat de Catalunya and PROMETEO and GenT Programmes Generalitat Valenciana, Spain; Göran Gustafssons Stiftelse, Sweden; The Royal Society and Leverhulme Trust, UK. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN, the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA), the Tier-2 facilities worldwide and large non-WLCG resource providers. Major contributors of computing resources are listed in Ref. []. Publisher Copyright: © 2020, CERN for the benefit of the ATLAS collaboration. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

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 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 evidence 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 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 evidence for this process.

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

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

M3 - Article

SN - 1434-6044

VL - 80

JO - European Physical Journal C. Particles and Fields

JF - European Physical Journal C. Particles and Fields

IS - 11

M1 - 1085

ER -

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

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