Search for standard model production of four top quarks with same-sign and multilepton final states in proton-proton collisions at √s = 13TeV
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
A search for standard model production of four top quarks (tt¯tt¯) 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 13 TeV at the LHC, and the data sample, recorded in 2016, corresponds to an integrated luminosity of 35.9 fb¯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 tt¯tt¯ cross section is measured to be 16.9⁺¹³·⁸ -₁₁.₄ fb, 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.
Date Issued
2018-02-19
Date Acceptance
2018-01-31
Citation
European Physical Journal C: Particles and Fields, 2018, 78 (2)
ISSN
1434-6044
Publisher
Springer Verlag (Germany)
Journal / Book Title
European Physical Journal C: Particles and Fields
Volume
78
Issue
2
Copyright Statement
© CERN for the benefit of the CMS collaboration 2018. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Funded by SCOAP3.
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000425395800003&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Physics, Particles & Fields
Physics
SUPERGAUGE TRANSFORMATIONS
SUPERSYMMETRY
EXTENSION
INVARIANT
NEUTRINO
DECAY
Publication Status
Published
Article Number
ARTN 140