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

Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Ambrogi, Federico and Asilar, Ece and Md. Ali, Mohd. Adli (2018) Search for standard model production of four top quarks with same-sign and multilepton final states in proton–proton collisions at √s=13TeV. European Physical Journal C, 78 (2). pp. 1-24. ISSN 1434-6044 E-ISSN 1434-6052

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Abstract

A search for standard model production of four top quarks (t t ¯ t t ¯) is reported using events containing at least three leptons (e , μ) or a same-sign lepton pair. The events are produced in proton–proton collisions at a center-of-mass energy of 13TeV at the LHC, and the data sample, recorded in 2016, corresponds to an integrated luminosity of 35.9fb-1. Jet multiplicity and flavor are used to enhance signal sensitivity, and dedicated control regions are used to constrain the dominant backgrounds. The observed and expected signal significances are, respectively, 1.6 and 1.0 standard deviations, and the t t ¯ t t ¯ cross section is measured to be 16.9-11.4+13.8fb, in agreement with next-to-leading-order standard model predictions. These results are also used to constrain the Yukawa coupling between the top quark and the Higgs boson to be less than 2.1 times its expected standard model value at 95% confidence level. © 2018, CERN for the benefit of the CMS collaboration.

Item Type:	Article (Journal)
Additional Information:	7861/63120
Uncontrolled Keywords:	Standard model production; Four top quarks; Same-sign and multilepton final states; Proton–proton collisions; √s=13TeV
Subjects:	Q Science > Q Science (General) Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science Kulliyyah of Science > Department of Physics
Depositing User:	Dr Mohd Adli MD Ali
Date Deposited:	04 Feb 2019 16:21
Last Modified:	15 Jul 2019 09:28
URI:	http://irep.iium.edu.my/id/eprint/63120

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