Search for standard model production of four top quarks with same-sign and multilepton final states in proton-proton collisions at √s = 13 TeV

the CMS Collaboration

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Abstract

A search for events containing four top quarks (ttbar-ttbar) is reported from proton-proton collisions recorded by the CMS experiment at √s = 13 TeV and corresponding to an integrated luminosity of 2.6 fb-1. The analysis considers the single-lepton (e or μ)+jets and the opposite-sign dilepton (μ+μ-, μ± e±, or e+e-)+jets channels. It uses boosted decision trees to combine information on the global event and jet properties to distinguish between ttbar-ttbar and ttbar production. The number of events observed after all selection requirements is consistent with expectations from background and standard model signal predictions, and an upper limit is set on the cross section for ttbar-ttbar production in the standard model of 94 fb at 95% confidence level (10.2x the prediction), with an expected limit of 118 fb. This is combined with the results from the published CMS search in the same-sign dilepton channel, resulting in an improved limit of 69 fb at 95% confidence level (7.4x the prediction), with an expected limit of 71 fb. These are the strongest constraints on the rate of ttbar-ttbar production to date.
Original languageEnglish
Pages (from-to)336-358
Number of pages23
JournalPhysics Letters B
Volume772
Early online date28 Jun 2017
DOIs
Publication statusPublished - 10 Sep 2017

Bibliographical note

Replaced with the published version. Added the journal reference and DOI. All the figures and tables, including additional supplemental figures and tables, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-16-016

Keywords

  • CMS
  • Physics
  • Top
  • BSM

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