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Title: Search for production of four top quarks in final states with same-sign or multiple leptons in proton-proton collisions at $$\sqrt{s}=$$ 13 TeV

Abstract

The standard model (SM) production of four top quarks ($$\mathrm{t\bar{t}t\bar{t}}$$) in proton-proton collision is studied by the CMS Collaboration. The data sample, collected during the 2016-2018 data taking of the LHC, corresponds to an integrated luminosity of 137 fb$$^{-a}$$ at a center-of-mass energy of 13 TeV. The events are required to contain two same-sign charged leptons (electrons or muons) or at least three leptons, and jets. The observed and expected significances for the $$\mathrm{t\bar{t}t\bar{t}}$$ signal are respectively 2.6 and 2.7 standard deviations, and the $$\mathrm{t\bar{t}t\bar{t}}$$ cross section is measured to be 12.6$$^{+5.8}_{-5.2}$$ fb. The results are used to constrain the Yukawa coupling of the top quark to the Higgs boson, $$y_{\mathrm{t}}$$, yielding a limit of $$|{y_{\mathrm{t}}/y_{\mathrm{t}}^{\mathrm{SM}}}| <$$ 1.7 at 95% confidence level, where $$y_{\mathrm{t}}^{\mathrm{SM}}$$ is the SM value of $$y_{\mathrm{t}}$$. They are also used to constrain the oblique parameter of the Higgs boson in an effective field theory framework, $$\hat{H}<0.12$$. Limits are set on the production of a heavy scalar or pseudoscalar boson in Type-II two-Higgs-doublet and simplified dark matter models, with exclusion limits reaching 350-470 GeV and 350-550 GeV for scalar and pseudoscalar bosons, respectively. Upper bounds are also set on couplings of the top quark to new light particles.

Authors:
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
CMS
OSTI Identifier:
1568864
Report Number(s):
FERMILAB-PUB-19-507-CMS; arXiv:1908.06463; CMS-TOP-18-003; CERN-EP-2019-163
oai:inspirehep.net:1750186
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
TBD
Additional Journal Information:
Journal Name: TBD
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Sirunyan, Albert M, and et al. Search for production of four top quarks in final states with same-sign or multiple leptons in proton-proton collisions at $\sqrt{s}=$ 13 TeV. United States: N. p., 2019. Web.
Sirunyan, Albert M, & et al. Search for production of four top quarks in final states with same-sign or multiple leptons in proton-proton collisions at $\sqrt{s}=$ 13 TeV. United States.
Sirunyan, Albert M, and et al. Sun . "Search for production of four top quarks in final states with same-sign or multiple leptons in proton-proton collisions at $\sqrt{s}=$ 13 TeV". United States. https://www.osti.gov/servlets/purl/1568864.
@article{osti_1568864,
title = {Search for production of four top quarks in final states with same-sign or multiple leptons in proton-proton collisions at $\sqrt{s}=$ 13 TeV},
author = {Sirunyan, Albert M and et al.},
abstractNote = {The standard model (SM) production of four top quarks ($\mathrm{t\bar{t}t\bar{t}}$) in proton-proton collision is studied by the CMS Collaboration. The data sample, collected during the 2016-2018 data taking of the LHC, corresponds to an integrated luminosity of 137 fb$^{-a}$ at a center-of-mass energy of 13 TeV. The events are required to contain two same-sign charged leptons (electrons or muons) or at least three leptons, and jets. The observed and expected significances for the $\mathrm{t\bar{t}t\bar{t}}$ signal are respectively 2.6 and 2.7 standard deviations, and the $\mathrm{t\bar{t}t\bar{t}}$ cross section is measured to be 12.6$^{+5.8}_{-5.2}$ fb. The results are used to constrain the Yukawa coupling of the top quark to the Higgs boson, $y_{\mathrm{t}}$, yielding a limit of $|{y_{\mathrm{t}}/y_{\mathrm{t}}^{\mathrm{SM}}}| <$ 1.7 at 95% confidence level, where $y_{\mathrm{t}}^{\mathrm{SM}}$ is the SM value of $y_{\mathrm{t}}$. They are also used to constrain the oblique parameter of the Higgs boson in an effective field theory framework, $\hat{H}<0.12$. Limits are set on the production of a heavy scalar or pseudoscalar boson in Type-II two-Higgs-doublet and simplified dark matter models, with exclusion limits reaching 350-470 GeV and 350-550 GeV for scalar and pseudoscalar bosons, respectively. Upper bounds are also set on couplings of the top quark to new light particles.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {8}
}