Evidence for four-top quark production in proton-proton collisions at √s = 13 TeV
The production of four top quarks (t¯tt¯t) is studied with LHC proton-proton collision data samples collected by the CMS experiment at a center-of-mass energy of 13TeV, and corresponding to integrated luminosities of up to 138fb−¹. Events that have no leptons (all-hadronic), one lepton, or two oppos...
| Autores: | , , , , , , , , , , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Universidad de Cantabria (UC) |
| Repositorio: | UCrea Repositorio Abierto de la Universidad de Cantabria |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.unican.es:10902/32147 |
| Acceso en línea: | https://hdl.handle.net/10902/32147 |
| Access Level: | acceso abierto |
| Palabra clave: | CMS Top quark |
| Sumario: | The production of four top quarks (t¯tt¯t) is studied with LHC proton-proton collision data samples collected by the CMS experiment at a center-of-mass energy of 13TeV, and corresponding to integrated luminosities of up to 138fb−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 t¯tt¯tmeasurement that includes the all-hadronic final state. The observed significance of the t¯tt¯tsignal in these final states of 3.9 standard deviations (1.5 expected) provides evidence for t¯tt¯tproduction, with a measured cross section of 36+12−11fb. 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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