Journal article
Search for standard model production of four top quarks in proton–proton collisions at √s = 13 TeV
Physics letters. B Nuclear, elementary particle and high-energy physics, Vol.772, pp.336-358
09/10/2017
DOI: 10.1016/j.physletb.2017.06.064
Abstract
A search for events containing four top quarks (ttt¯ t)¯ 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 ttt¯ t and ¯ tt 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 ttt¯ t production ¯ in the standard model of 94 fb at 95%
confidence level (10.2 × 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 (7.4 × the prediction), with an expected limit of 71 fb. These are the
strongest constraints on the rate of ttt¯ t production ¯ to date
Details
- Title: Subtitle
- Search for standard model production of four top quarks in proton–proton collisions at √s = 13 TeV
- Creators
- CMS Collaboration (Institution)
- Contributors
- B. Bilki (Contributor) - University of IowaW Clarida (Contributor) - University of IowaKamuran Dilsiz (Contributor) - University of Iowa, Physics and AstronomyS. Durgut (Contributor) - University of IowaR. P. Gandrajula (Contributor) - University of IowaM. Haytmyradov (Contributor) - University of IowaV Khristenko (Contributor) - University of IowaJ-P Merlo (Contributor) - University of IowaH Mermerkaya (Contributor) - University of IowaAlexi Mestvirishvili (Contributor) - University of Iowa, Physics and AstronomyA. Moeller (Contributor) - University of IowaJane M Nachtman (Contributor) - University of Iowa, Physics and AstronomyHasan Ogul (Contributor) - University of Iowa, Physics and AstronomyYasar Onel (Contributor) - University of Iowa, Physics and AstronomyF. Ozok (Contributor) - University of IowaAldo Penzo (Contributor) - University of Iowa, Physics and AstronomyC. Snyder (Contributor) - University of IowaE. Tiras (Contributor) - University of IowaJames W Wetzel (Contributor) - University of Iowa, Physics and AstronomyKai Yi (Contributor) - University of Iowa, Physics and Astronomy
- Resource Type
- Journal article
- Publication Details
- Physics letters. B Nuclear, elementary particle and high-energy physics, Vol.772, pp.336-358
- DOI
- 10.1016/j.physletb.2017.06.064
- ISSN
- 0370-2693
- eISSN
- 1873-2445
- Publisher
- Elsevier
- Grant note
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- Language
- English
- Date published
- 09/10/2017
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984440057502771
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