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Compact Muon Solenoid
LHC, CERN

CMS-PAS-TOP-17-019
Search for standard model production of four top quarks with the single-lepton and opposite-sign dilepton final states in proton-proton collisions at s= 13 TeV
Abstract: A search for the standard model production of four top quarks (pptˉttˉt) is reported using events with single-lepton (e, μ) + jets and opposite-sign dilepton (μ+μ, μ±e, or e+e) + jets signatures. The events are collected in proton-proton collisions recorded by the CMS detector at the LHC at s= 13 TeV in a sample corresponding to an integrated luminosity of 35.8 fb1. A multivariate analysis using global event and jet properties based on boosted decision trees is used to discriminate tˉttˉt from tˉt production. No significant deviation is observed from the predicted background. An upper limit is set on the cross section for tˉttˉt production in the standard model of 48 fb at 95 confidence level. When combined with the previous measurement of σtˉttˉt by the CMS experiment from an analysis of other final states, the observed signal significance is 1.4 standard deviations and the combined cross section measurement is σtˉttˉt= 13+119 fb.
CMS Publications
Compact Muon Solenoid
LHC, CERN