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dc.contributor.authorAtlas Collaboration
dc.contributor.authorAguilar Saavedra, Juan Antonio 
dc.contributor.authorRodríguez Chala, Mikael
dc.identifier.citationThe ATLAS collaboration., Aad, G., Abbott, B. et al. Measurement of the tt¯tt¯ production cross section in pp collisions at s√ = 13 TeV with the ATLAS detector. J. High Energ. Phys. 2021, 118 (2021). []es_ES
dc.descriptionWe 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.es_ES
dc.descriptionThe 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 (U.K.) and BNL (U.S.A.), the Tier-2 facilities worldwide and large non-WLCG resource providers. Major contributors of computing resources are listed in ref.es_ES
dc.description.abstractA measurement of four-top-quark production using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the Large Hadron Collider corresponding to an integrated luminosity of 139 fb−1 is presented. Events are selected if they contain a single lepton (electron or muon) or an opposite-sign lepton pair, in association with multiple jets. The events are categorised according to the number of jets and how likely these are to contain b-hadrons. A multivariate technique is then used to discriminate between signal and background events. The measured four-top-quark production cross section is found to be 26−15+17 fb, with a corresponding observed (expected) significance of 1.9 (1.0) standard deviations over the background-only hypothesis. The result is combined with the previous measurement performed by the ATLAS Collaboration in the multilepton final state. The combined four-top-quark production cross section is measured to be 24−6+7 fb, with a corresponding observed (expected) signal significance of 4.7 (2.6) standard deviations over the background-only predictions. It is consistent within 2.0 standard deviations with the Standard Model expectation of 12.0 ± 2.4 fb.es_ES
dc.description.sponsorshipANPCyT, Argentinaes_ES
dc.description.sponsorshipYerPhI, Armeniaes_ES
dc.description.sponsorshipARC, Australiaes_ES
dc.description.sponsorshipBMWFW y FWF, Austriaes_ES
dc.description.sponsorshipANAS, Azerbaiyánes_ES
dc.description.sponsorshipSSTC, Bielorrusiaes_ES
dc.description.sponsorshipCNPq y FAPESP, Brasiles_ES
dc.description.sponsorshipNSERC, NRC y CFI, Canadáes_ES
dc.description.sponsorshipCERN; ANID, Chilees_ES
dc.description.sponsorshipCAS, MOST y NSFC, Chinaes_ES
dc.description.sponsorshipMinciencias, Colombiaes_ES
dc.description.sponsorshipMSMT CR, MPO CR y VSC CR, República Checaes_ES
dc.description.sponsorshipDNRF y DNSRC, Dinamarcaes_ES
dc.description.sponsorshipIN2P3-CNRS y CEA-DRF/IRFU, Franciaes_ES
dc.description.sponsorshipSRNSFG, Georgiaes_ES
dc.description.sponsorshipBMBF, HGF y MPG, Alemaniaes_ES
dc.description.sponsorshipGSRI, Greciaes_ES
dc.description.sponsorshipRGC y la RAE de Hong Kong, Chinaes_ES
dc.description.sponsorshipISF y Benoziyo Center, Israeles_ES
dc.description.sponsorshipINFN, Italiaes_ES
dc.description.sponsorshipMEXT y JSPS, Japónes_ES
dc.description.sponsorshipCNRST, Marruecoses_ES
dc.description.sponsorshipNWO, Países Bajoses_ES
dc.description.sponsorshipRCN, Noruegaes_ES
dc.description.sponsorshipMNiSW y NCN, Poloniaes_ES
dc.description.sponsorshipFCT, Portugales_ES
dc.description.sponsorshipMNE/IFA, Rumaniaes_ES
dc.description.sponsorshipMES de Rusia y NRC KI, Federación de Rusiaes_ES
dc.description.sponsorshipMESTD, Serbiaes_ES
dc.description.sponsorshipMSSR, Eslovaquiaes_ES
dc.description.sponsorshipARRS y MIZŠ, Esloveniaes_ES
dc.description.sponsorshipDSI/NRF, Sudáfricaes_ES
dc.description.sponsorshipMICINN, Españaes_ES
dc.description.sponsorshipSRC y Fundación Wallenberg, Sueciaes_ES
dc.description.sponsorshipSERI, SNSF y cantones de Berna y Ginebra, Suizaes_ES
dc.description.sponsorshipMOST, Taiwánes_ES
dc.description.sponsorshipTAEK, Turquíaes_ES
dc.description.sponsorshipSTFC, Reino Unidoes_ES
dc.description.sponsorshipDOE y NSF, Estados Unidos de Américaes_ES
dc.description.sponsorshipBCKDF, CANARIE, Compute Canada y CRC, Canadáes_ES
dc.description.sponsorshipInversiones d'Avenir Labex, Investissements d'Avenir Idex y ANR, Franciaes_ES
dc.description.sponsorshipDFG y AvH Foundation, Alemaniaes_ES
dc.description.sponsorshipProgramas Herakleitos, Thales y Aristeia cofinanciados por la UE-FSE y el NSRF griego, Grecia;es_ES
dc.description.sponsorshipBSF-NSF y GIF, Israeles_ES
dc.description.sponsorshipMecanismo Financiero de Noruega 2014-2021, Noruegaes_ES
dc.description.sponsorshipFundación Bancaria La Caixa, PROGRAMA CERCA Generalitat de Catalunya y los Programas PROMETEO y GenT de la Generalitat Valenciana, Españaes_ES
dc.description.sponsorshipCOSTE, ERC, FEDER, Acciones Horizonte 2020 y Marie Skłodowska-Curie, Unión Europeaes_ES
dc.description.sponsorshipGöran Gustafssons Stiftelse, Sueciaes_ES
dc.description.sponsorshipThe Royal Society y Leverhulme Trust, Reino Unidoes_ES
dc.rightsAtribución 3.0 España*
dc.subjectHadron-Hadron scattering (experiments)es_ES
dc.subjectTop physicses_ES
dc.titleMeasurement of the tt¯tt¯ production cross section in pp collisions at √s = 13 TeV with the ATLAS detectores_ES

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