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.

Evidence for four-top quark production in proton-proton collisions at sqrt(s) = 13 TeV

CANDELISE, V.;DELLA RICCA, G.;SORRENTINO, G.;
2023-01-01

Abstract

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.
2023
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https://www.sciencedirect.com/science/article/pii/S0370269323004100
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3052679
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