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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

Autori

A. M. Sirunyan et al. (The CMS Collaboration) Anno 2019

Tipologia

Articolo Rivista internazionale con referaggio

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 +11−9 fb. The result is also interpreted in the framework of effective field theory.

Referenza_Bibliografica

J. High Energ. Phys. 11 (2019) 82
https://doi.org/10.1007/JHEP11(2019)82

Riferimento WEB

https://arxiv.org/abs/1906.02805

Riferimento WEB 2

http://inspirehep.net/record/1738833

Unita di Ricerca

RADEC

LastUpdate

05/01/2022

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