A search for the standard model production of four top quarks (pp tttt)is reported using single-lepton plus jets and opposite-sign dileptonplus jets signatures. Proton-proton collisions are recorded with the CMSdetector at the LHC at a center-ofmass energy of 13 TeV in a samplecorresponding to an integrated luminosity of 35.8 fb-1. A multivariateanalysis exploiting global event and jet properties is used todiscriminate tttt from tt production. No significant deviation isobserved from the predicted background. An upper limit is set on thecross section for tttt production in the standard model of 48 fb at 95%confidence level. When combined with a previous measurement by the CMSexperiment from an analysis of other final states, the observed signalsignificance is 1.4 standard deviations, and the combined cross sectionmeasurement is 13+911 fb. The result is also interpreted in theframework of effective field theory.
Search for the production of four top quarks in the single -lepton and opposite -sign dilepton final states in proton -proton collisions at=13 TeV
Albergo, S.;Costa, S.;Potenza, R.;Tricomi, A.;Tuve, C.;
2019-01-01
Abstract
A search for the standard model production of four top quarks (pp tttt)is reported using single-lepton plus jets and opposite-sign dileptonplus jets signatures. Proton-proton collisions are recorded with the CMSdetector at the LHC at a center-ofmass energy of 13 TeV in a samplecorresponding to an integrated luminosity of 35.8 fb-1. A multivariateanalysis exploiting global event and jet properties is used todiscriminate tttt from tt production. No significant deviation isobserved from the predicted background. An upper limit is set on thecross section for tttt production in the standard model of 48 fb at 95%confidence level. When combined with a previous measurement by the CMSexperiment from an analysis of other final states, the observed signalsignificance is 1.4 standard deviations, and the combined cross sectionmeasurement is 13+911 fb. The result is also interpreted in theframework of effective field theory.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.


