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Título: | Evidence for tt¯ tt¯ production in the multilepton final state in proton–proton collisions at √s=13 TeV with the ATLAS detector |
Autor: | Aparisi Pozo, J.A.; Bailey, A.J.; Cabrera, Susana CSIC ORCID; Cardillo, Fabio; Castillo, F.L.; Castillo Mª Victoria; Costa, M. J.; Escobar, Carlos CSIC ORCID ; Estrada, Oscar; Ferrer, Antonio CSIC ORCID; Fiorini, L. CSIC ORCID; Fullana, Esteban CSIC ORCID; Fuster, Juan CSIC ORCID; García García, Carmen CSIC ORCID; García Navarro, José Enrique CSIC ORCID; González de la Hoz, Santiago CSIC ORCID CVN; Gonzalvo Rodríguez, Galo Rafael; Guerrero Rojas, J.G.R.; Higón, Emilio CSIC ORCID; Lacasta Llácer, Carlos CSIC ORCID ; Lozano Bahilo, José J.; Madaffari, Daniele CSIC ORCID; Mamuzic, Judita; Martí García, Salvador; Martinez Agullo, Pablo; Mitsou, Vasiliki A. CSIC ORCID ; Moreno Llácer, María CSIC ORCID; Poveda, Joaquín CSIC ORCID; Prades Ibañez, Alberto; Rodriguez Bosca, S.; Ruiz Martínez, Arantxa CSIC ORCID; Salt, José CSIC ORCID; Santra, A; Sayago Galvan, Ivan; Soldevila, Urmila CSIC ORCID; Sánchez Martínez, Javier CSIC ORCID; Torró Pastor, Emma CSIC ORCID; Valls Ferrer, Juan Antonio CSIC ORCID; Valero, Alberto CSIC ORCID; Vos, Marcel CSIC ORCID; ATLAS Collaboration | Fecha de publicación: | nov-2020 | Editor: | Springer Nature | Citación: | European Physical Journal C 80: 1085 (2020) | Resumen: | A search is presented for four-top-quark production using an integrated luminosity of 139 fb of proton–proton collision data at a centre-of-mass energy of 13TeV 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 24-6+7 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. | Versión del editor: | http://dx.doi.org/10.1140/epjc/s10052-020-08509-3 | URI: | http://hdl.handle.net/10261/229999 | DOI: | 10.1140/epjc/s10052-020-08509-3 | Identificadores: | doi: 10.1140/epjc/s10052-020-08509-3 issn: 1434-6052 |
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123_ATLAS_Evidence.pdf | 1,42 MB | Adobe PDF | Visualizar/Abrir |
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