The production of four top quarks (ttbar ttbar ) 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 ttbar ttbar measurement that includes the all-hadronic final state. The observed significance of the ttbar ttbar signal in these final states of 3.9 standard deviations (1.5 expected) provides evidence for ttbar ttbar production, with a measured cross section of 36+12 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)=13TeV
Cappati, A.;Meridiani, P.;Amapane, N.;Argiro, S.;Bellan, R.;Bellora, A.;Costa, M.;Covarelli, R.;Grippo, M.;Kiani, B.;Luongo, F.;Mecca, A.;Migliore, E.;Obertino, M. M.;Pacher, L.;Shchelina, K.;Siviero, F.;Sola, V.;Solano, A.;Soldi, D.;Tarricone, C.;Tornago, M.;Umoret, G.;Vagnerini, A.;Rumerio, P.;Ravera, F.;Salvatico, R.;
2023-01-01
Abstract
The production of four top quarks (ttbar ttbar ) 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 ttbar ttbar measurement that includes the all-hadronic final state. The observed significance of the ttbar ttbar signal in these final states of 3.9 standard deviations (1.5 expected) provides evidence for ttbar ttbar production, with a measured cross section of 36+12 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.File | Dimensione | Formato | |
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