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Search for the production of four top quarks in 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 (pp ? tt¯tt¯) is reported using single-lepton plus jets and opposite-sign dilepton plus jets signatures. Proton-proton collisions are recorded with the CMS detector at the LHC at a center-of-mass energy of 13 TeV in a sample corresponding to an integrated luminosity of 35.8 fb-1. A multivariate analysis exploiting global event and jet properties is used to discriminate tt¯tt¯ from tt¯ production. No significant deviation is observed from the predicted background. An upper limit is set on the cross section for tt¯tt¯ production in the standard model of 48 fb at 95% confidence level. When combined with a previous measurement 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 13+11?913?9+11 fb. The result is also interpreted in the framework of effective field theory.

 Fuente: Journal of High Energy Physics, Vol. 2019, Num. 11, Art. Num. 082

 Editorial: Springer Verlag

 Fecha de publicación: 01/11/2019

 Nº de páginas: 53

 Tipo de publicación: Artículo de Revista

 DOI: 10.1007/JHEP11(2019)082

 ISSN: 1126-6708,1029-8479

 Url de la publicación: https://doi.org/10.1007/JHEP11(2019)082