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Search for standard model production of four top quarks in proton-proton collisions at √s = 13 TeV

Search for standard model production of four top quarks in proton-proton collisions at √s = 13 TeV
Search for standard model production of four top quarks in proton-proton collisions at √s = 13 TeV
A search for events containing four top quarks (tt¯tt¯) 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 tt¯tt¯ 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 tt¯tt¯ 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 tt¯tt¯ production to date.
CMS, Physics, Top, BSM
0370-2693
Sirunyan, Albert M
7907272b-cb4e-4ffb-97b1-60a9ffc11d1b
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
The CMS Collaboration
Sirunyan, Albert M
7907272b-cb4e-4ffb-97b1-60a9ffc11d1b
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3

The CMS Collaboration (2017) Search for standard model production of four top quarks in proton-proton collisions at √s = 13 TeV. Physics Letters B, 772, [336]. (doi:10.1016/j.physletb.2017.06.064).

Record type: Article

Abstract

A search for events containing four top quarks (tt¯tt¯) 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 tt¯tt¯ 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 tt¯tt¯ 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 tt¯tt¯ production to date.

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More information

Accepted/In Press date: 24 June 2017
e-pub ahead of print date: 28 June 2017
Published date: 10 September 2017
Keywords: CMS, Physics, Top, BSM
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 407041
URI: http://eprints.soton.ac.uk/id/eprint/407041
ISSN: 0370-2693
PURE UUID: 3d92c21b-1d9d-4c16-9ef4-bd59b7c5c55d
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

Catalogue record

Date deposited: 29 Mar 2017 01:12
Last modified: 07 Oct 2020 01:53

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