Evidence for four-top quark production in proton-proton collisions at √s = 13 TeV
The production of four top quarks (ttt¯ t)¯ is studied with LHC proton-proton collision data samples collected by the CMS experiment at a center-of-mass energy of 13 TeV, and corresponding to integrated luminosities of up to 138 fb−1. Events that have no leptons (all-hadronic), one lepton, or two op...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | Brasil |
| Institución: | Universidade Federal do Rio Grande do Sul (UFRGS) |
| Repositorio: | Repositório Institucional da UFRGS |
| Idioma: | inglés |
| OAI Identifier: | oai:www.lume.ufrgs.br:10183/278497 |
| Acceso en línea: | http://hdl.handle.net/10183/278497 |
| Access Level: | acceso abierto |
| Palabra clave: | Aceleradores de partículas Colisões proton-proton CMS Top quark |
| Sumario: | The production of four top quarks (ttt¯ t)¯ is studied with LHC proton-proton collision data samples collected by the CMS experiment at a center-of-mass energy of 13 TeV, and corresponding to integrated luminosities of up to 138 fb−1. Events that have no leptons (all-hadronic), one lepton, or two opposite sign leptons (where lepton refers only to prompt electrons or prompt muons) are considered. This is the first ttt¯ t measurement ¯ that includes the all-hadronic final state. The observed significance of the ttt¯ t¯ signal in these final states of 3.9 standard deviations (1.5 expected) provides evidence for ttt¯ t production, ¯ with a measured cross section of 36+12 −11 fb. Combined with earlier CMS results in other final states, the signal significance is 4.0 standard deviations (3.2 expected). The combination returns an observed cross section of 17 ± 4 (stat) ± 3 (syst) fb, which is consistent with the standard model prediction. |
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