Search for production of four top quarks in final states with same-sign or multiple leptons in proton–proton collisions at √s=13TeV

CMS Collaboration

doi:10.1140/epjc/s10052-019-7593-7

Search for production of four top quarks in final states with same-sign or multiple leptons in proton–proton collisions at √s=13TeV

CMS Collaboration

Yerevan Physics Institute
Institut fÃ¼r Hochenergiephysik
Vienna University of Technology
Institute for Nuclear Problems of Belarusian State University
University of Antwerp
Vrjie Universiteit Brussel
c/o DESY
INFN Sezione di Torino
University of Turin
Université Libre de Bruxelles
Ghent University
Université Paris-Saclay
University of Louvain
Centro Brasileiro de Pesquisas Fisicas
Rua São Francisco de Xavier
University of Campinas (UNICAMP)
Universidade Federal do Rio Grande do Sul
UFMS
Universidade Federal de Pelotas
São Paulo State University
Federal University of ABC (UFABC)
Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences
University of Sofia
Beihang University
Institute of High Energy Physics, Chinese Academy of Sciences
Quaid-i-Azam University
University of Chinese Academy of Sciences
State Key Laboratory of Nuclear Physics and Technology
University of Kansas
Tsinghua University
University of Virginia
Zhejiang University
Universidad de Los Andes, Colombia
Universidad de Antioquia
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split
Faculty of Science, University of Split
Ruđer Bošković Institute
Institute for Theoretical and Experimental Physics
University of Cyprus
Charles University
Joint Institute for Nuclear Research, Dubna
Escuela Politecnica Nacional
Universidad San Francisco de Quito
Egyptian Network of High Energy Physics
British University in Egypt
Ain Shams University
National Institute of Chemical Physics and Biophysics, Tallinn
University of Helsinki
Helsinki Institute of Physics
LUT University
Purdue University
Ip Paris
Centre national de la recherche scientifique
Université de Haute Alsace
Université Paris-Sud
IGFL, Université de Lyon, Université Lyon 1
Georgian Technical University
Tbilisi State University
RWTH Aachen University
Saha Institute of Nuclear Physics
Indian Institute of Technology Madras
European Organization for Nuclear Research
Erzincan University
Universität Hamburg
Joint Faculty of the Brandenburg University of Technology Cottbus Senftenberg
Institute of Meteorology and Climate Research
NCSR Demokritos
University of Athens
National Technical University of Athens
University of Ioannina
Eötvös Loránd University
Institute of Nuclear Research ATOMKI
Wigner Research Centre for Physics
University of Debrecen
Eszterhazy Karoly University
Indian Institute of Science
National Institute of Science Education and Research
IIT Bhubaneswar
Institute of Physics Bhubaneswar
Panjab University
Indian Institute of Science Education and Research (IISER)
University of Delhi
Shoolini University
Tata Institute of Fundamental Research, Mumbai
Northwestern University
University of Visva-Bharati
Bhabha Atomic Research Centre
Eszterhazy Karoly University
Fermi National Accelerator Laboratory
Institute for Research in Fundamental Sciences (IPM)
Isfahan University of Technology
University College Dublin
INFN Sezione di Bari
Università degli studi di Bari Aldo Moro
Politecnico di Bari
INFN Sezione di Bologna
University of Bologna
ENEA Climate Modeling and Impacts
INFN Sezione di Catania
Università degli Studi di Catania
CSFNSM
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
University of Florence
LNF-INFN
Sezione di Genova
University of Genoa
INFN Sezione di Milano-Bicocca
University of Milano-Bicocca
INFN Sezione di Napoli
Università degli Studi della Basilicata
UniversitÃ di Napoli â€˜Federico IIâ€™
UniversitÃ G. Marconi
INFN
University of Padova
INFN Sezione di Pavia
University of Pavia
INFN Sezione di Perugia
University of Perugia
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Scuola Normale Superiore di Pisa
University of Pisa
Scuola Normale e Sezione dell'Infn
Sezione di Roma
University of Rome
Laboratory of Molecular Pathology
INFN Sezione di Trieste
University of Trieste
Kyungpook National University
Sungkyunkwan University
Women and Infants Hospital of Rhode Island-Warren Alpert Medical School of Brown University
Texas Tech University
Chonnam National University
University of Seoul
Hanyang University
Korea University
Seoul National University
Kyung Hee University
Sejong University
Riga Technical University
Vilnius University
University Malaya
MOSTI
Universidad de Sonora
CINVESTAV-IPN
Consejo Nacional de Ciencia y Tecnología
Universidad Iberoamericana
Benemerita Universidad Autonoma de Puebla
Universidad AutÃ³noma de San Luis PotosÃ
University of Montenegro
University of Auckland
University of Canterbury
Agh University of Science and Technology Faculty of Computer Science
National Centre for Nuclear Research
University of Warsaw
Warsaw University of Technology
LaboratÃ³rio de InstrumentaÃ§Ã£o e FÃsica Experimental de PartÃculas
Institute for Nuclear Research of the Russian Academy of Sciences
National Research Nuclear University â€™Moscow Engineering Physics Instituteâ€™ (MEPhI)
Petersburg Nuclear Physics Institute (PNPI)
St. Petersburg State Polytechnical University
University of Florida
Imperial College London
Moscow Institute of Physics and Technology
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
Moscow State University
CCLRC Rutherford Appleton Laboratory
University of Southampton
California Institute of Technology
Novosibirsk State University
Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
Kurchatov Institute
National Research Tomsk Polytechnic University
Tomsk State University
University of Belgrade
University of Belgrade
CIB-CSIC
Universidad Autónoma de Madrid
University of Oviedo
CSIC-Univ. Cantabria
University of Siena
University of Colombo
University of Ruhuna
Paul Scherrer Institut
University of Zurich
ETH Zurich
Stefan Meyer Institute for Subatomic Physics (SMI)
National Central University
National Taiwan University
University of California, San Diego
Chulalongkorn University
Cukurova University
Texas A&M University
Burdur Mehmet Akif Ersoy University
Adiyaman University
SÄ±rnak University
Beykent University
Istanbul Aydin University
Mersin University
Piri Reis University
Gaziosmanpasa University
Middle East Technical University (METU)
Ozyegin University
Izmir Institute of Technology
Bogazici University
Marmara University
Kafkas University
Istanbul Bilgi University
Istanbul Technical University
Hacettepe University
Istanbul University
Academy of Science of Ukraine
Kharkov Institute of Physics and Technology
University of Bristol
IPPP Durham University
University of Puerto Rico
Monash University
Brunel University London
Baylor University
Catholic University of America
University of Alabama
Boston University
Bethel University
Karamanoğlu Mehmetbey University
University of California, Davis
Princeton University
University of California, Los Angeles
University of California, Riverside
University of Wisconsin-Madison
University of California, Santa Barbara
Carnegie Mellon University
University of Colorado Boulder
Cornell University
Massachusetts Institute of Technology
Florida International University
Florida State University
Florida Institute of Technology
University of Illinois at Chicago
University of Iowa
Bingol University
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Johns Hopkins University
Kansas State University
Lawrence Livermore National Laboratory
University of Maryland, College Park
University of Minnesota Twin Cities
University of Mississippi
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University at Buffalo, The State University of New York
Northeastern University
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Rice University
The Ohio State University
Purdue University Northwest
University of Rochester
Rutgers University–New Brunswick
University of Tennessee
Texas A&M University at Qatar
Vanderbilt University
Wayne State University
University of Hyderabad

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Abstract

The standard model (SM) production of four top quarks (t t ¯ t t ¯) in proton–proton collisions 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 137fb-1 at a center-of-mass energy of 13TeV. 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 t t ¯ t t ¯ signal are respectively 2.6 and 2.7 standard deviations, and the t t ¯ t t ¯ cross section is measured to be 12.6-5.2+5.8fb. The results are used to constrain the Yukawa coupling of the top quark to the Higgs boson, y_t, yielding a limit of |yt/ytSM|<1.7 at 95 % confidence level, where ytSM is the SM value of y_t. They are also used to constrain the oblique parameter of the Higgs boson in an effective field theory framework, 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 350–470GeV and 350–550GeV for scalar and pseudoscalar bosons, respectively. Upper bounds are also set on couplings of the top quark to new light particles.

Original language	English
Article number	75
Journal	European Physical Journal C
Volume	80
Issue number	2
DOIs	https://doi.org/10.1140/epjc/s10052-019-7593-7
Publication status	Published - 1 Feb 2020

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10.1140/epjc/s10052-019-7593-7

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@article{2e59e7d0c61944dcb81675862c9eae2e,

title = "Search for production of four top quarks in final states with same-sign or multiple leptons in proton–proton collisions at √s=13TeV",

abstract = "The standard model (SM) production of four top quarks (t t ¯ t t ¯) in proton–proton collisions 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 137fb-1 at a center-of-mass energy of 13TeV. 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 t t ¯ t t ¯ signal are respectively 2.6 and 2.7 standard deviations, and the t t ¯ t t ¯ cross section is measured to be 12.6-5.2+5.8fb. The results are used to constrain the Yukawa coupling of the top quark to the Higgs boson, yt, yielding a limit of |yt/ytSM|<1.7 at 95 \% confidence level, where ytSM is the SM value of yt. They are also used to constrain the oblique parameter of the Higgs boson in an effective field theory framework, H\textasciicircum{} < 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 350–470GeV and 350–550GeV for scalar and pseudoscalar bosons, respectively. Upper bounds are also set on couplings of the top quark to new light particles.",

author = "\{CMS Collaboration\} and Sirunyan, \{A. M.\} and A. Tumasyan and W. Adam and F. Ambrogi and T. Bergauer and J. Brandstetter and M. Dragicevic and J. Er{\~A}¶ and \{Escalante Del Valle\}, A. and M. Flechl and R. Fr{\~A}¼hwirth and M. Jeitler and N. Krammer and I. Kr{\~A}¤tschmer and D. Liko and T. Madlener and I. Mikulec and N. Rad and J. Schieck and R. Sch{\~A}¶fbeck and M. Spanring and D. Spitzbart and W. Waltenberger and Wulz, \{C. E.\} and M. Zarucki and V. Drugakov and V. Mossolov and \{Suarez Gonzalez\}, J. and Darwish, \{M. R.\} and \{De Wolf\}, \{E. A.\} and \{Di Croce\}, D. and X. Janssen and A. Lelek and M. Pieters and \{Rejeb Sfar\}, H. and \{Van Haevermaet\}, H. and \{Van Mechelen\}, P. and \{Van Putte\}, S. and \{Van Remortel\}, N. and F. Blekman and Bols, \{E. S.\} and \{Granier de Cassagnac\}, R. and M. Nguyen and C. Ochando and P. Paganini and R. Salerno and A. Zabi and A. Zghiche and \{De Wit\}, A. and A. Cappati",

note = "Publisher Copyright: {\textcopyright} 2020, CERN for the benefit of the CMS collaboration.",

year = "2020",

month = feb,

day = "1",

doi = "10.1140/epjc/s10052-019-7593-7",

language = "English",

volume = "80",

journal = "European Physical Journal C",

issn = "1434-6044",

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TY - JOUR

T1 - Search for production of four top quarks in final states with same-sign or multiple leptons in proton–proton collisions at √s=13TeV

AU - CMS Collaboration

AU - Sirunyan, A. M.

AU - Tumasyan, A.

AU - Adam, W.

AU - Ambrogi, F.

AU - Bergauer, T.

AU - Brandstetter, J.

AU - Dragicevic, M.

AU - ErÃ¶, J.

AU - Escalante Del Valle, A.

AU - Flechl, M.

AU - FrÃ¼hwirth, R.

AU - Jeitler, M.

AU - Krammer, N.

AU - KrÃ¤tschmer, I.

AU - Liko, D.

AU - Madlener, T.

AU - Mikulec, I.

AU - Rad, N.

AU - Schieck, J.

AU - SchÃ¶fbeck, R.

AU - Spanring, M.

AU - Spitzbart, D.

AU - Waltenberger, W.

AU - Wulz, C. E.

AU - Zarucki, M.

AU - Drugakov, V.

AU - Mossolov, V.

AU - Suarez Gonzalez, J.

AU - Darwish, M. R.

AU - De Wolf, E. A.

AU - Di Croce, D.

AU - Janssen, X.

AU - Lelek, A.

AU - Pieters, M.

AU - Rejeb Sfar, H.

AU - Van Haevermaet, H.

AU - Van Mechelen, P.

AU - Van Putte, S.

AU - Van Remortel, N.

AU - Blekman, F.

AU - Bols, E. S.

AU - Granier de Cassagnac, R.

AU - Nguyen, M.

AU - Ochando, C.

AU - Paganini, P.

AU - Salerno, R.

AU - Zabi, A.

AU - Zghiche, A.

AU - De Wit, A.

AU - Cappati, A.

PY - 2020/2/1

Y1 - 2020/2/1

N2 - The standard model (SM) production of four top quarks (t t ¯ t t ¯) in proton–proton collisions 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 137fb-1 at a center-of-mass energy of 13TeV. 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 t t ¯ t t ¯ signal are respectively 2.6 and 2.7 standard deviations, and the t t ¯ t t ¯ cross section is measured to be 12.6-5.2+5.8fb. The results are used to constrain the Yukawa coupling of the top quark to the Higgs boson, yt, yielding a limit of |yt/ytSM|<1.7 at 95 % confidence level, where ytSM is the SM value of yt. They are also used to constrain the oblique parameter of the Higgs boson in an effective field theory framework, 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 350–470GeV and 350–550GeV for scalar and pseudoscalar bosons, respectively. Upper bounds are also set on couplings of the top quark to new light particles.

AB - The standard model (SM) production of four top quarks (t t ¯ t t ¯) in proton–proton collisions 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 137fb-1 at a center-of-mass energy of 13TeV. 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 t t ¯ t t ¯ signal are respectively 2.6 and 2.7 standard deviations, and the t t ¯ t t ¯ cross section is measured to be 12.6-5.2+5.8fb. The results are used to constrain the Yukawa coupling of the top quark to the Higgs boson, yt, yielding a limit of |yt/ytSM|<1.7 at 95 % confidence level, where ytSM is the SM value of yt. They are also used to constrain the oblique parameter of the Higgs boson in an effective field theory framework, 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 350–470GeV and 350–550GeV for scalar and pseudoscalar bosons, respectively. Upper bounds are also set on couplings of the top quark to new light particles.

UR - https://www.scopus.com/pages/publications/85078848913

U2 - 10.1140/epjc/s10052-019-7593-7

DO - 10.1140/epjc/s10052-019-7593-7

M3 - Article

AN - SCOPUS:85078848913

SN - 1434-6044

VL - 80

JO - European Physical Journal C

JF - European Physical Journal C

IS - 2

M1 - 75

ER -

Search for production of four top quarks in final states with same-sign or multiple leptons in proton–proton collisions at √s=13TeV

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