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

CMS Collaboration

doi:10.1140/epjc/s10052-018-5607-5

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

CMS Collaboration

Yerevan Physics Institute
Institut für Hochenergiephysik
Vienna University of Technology
Institute for Nuclear Problems of Belarusian State University
Université Paris-Saclay
c/o DESY
University of Antwerp
Vrjie Universiteit Brussel
Université Libre de Bruxelles
Ghent University
University of Louvain
Centro Brasileiro de Pesquisas Fisicas
Rua São Francisco de Xavier
University of Campinas (UNICAMP)
Universidade Federal do Rio Grande do Sul
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
European Organization for Nuclear Research
University of California, Davis
Texas Tech University
State Key Laboratory of Nuclear Physics and Technology
Tsinghua University
University of Virginia
Universidad de Los Andes, Colombia
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
Universidad San Francisco de Quito
Egyptian Network of High Energy Physics
Helwan University
Zewail City of Science and Technology
British University in Egypt
Cairo University
National Institute of Chemical Physics and Biophysics, Tallinn
University of Helsinki
Helsinki Institute of Physics
LUT University
Saha Institute of Nuclear Physics
King Abdulaziz University
Université de Strasbourg
Université de Haute Alsace
Université Paris-Sud
IGFL, Université de Lyon, Université Lyon 1
Moscow State University
Georgian Technical University
Tbilisi State University
RWTH Aachen University
Universität Hamburg
Joint Faculty of the Brandenburg University of Technology Cottbus Senftenberg
Institut für Experimentelle Teilchenphysik
NCSR Demokritos
University of Athens
National Technical University of Athens
University of Ioannina
Eötvös Loránd University
Wigner Research Centre for Physics
Institute of Nuclear Research ATOMKI
University of Debrecen
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
Indian Institute of Technology Madras
Bhabha Atomic Research Centre
Fermi National Accelerator Laboratory
University of Visva-Bharati
University of Ruhuna
Institute for Research in Fundamental Sciences (IPM)
Isfahan University of Technology
Yazd University
Islamic Azad University, Science and Research Branch
University College Dublin
INFN Sezione di Bari
Università degli studi di Bari Aldo Moro
Politecnico di Bari
INFN Sezione di Bologna
University of Bologna
LNF-INFN
INFN Sezione di Catania
Università degli Studi di Catania
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
University of Florence
University of Siena
Sezione di Genova
University of Genoa
INFN Sezione di Milano-Bicocca
University of Milano-Bicocca
INFN Sezione di Napoli
Università degli Studi della Basilicata
University of Rome
University of Naples Federico II
INFN
University of Padova
Università di Trento
INFN Sezione di Pavia
University of Pavia
INFN Sezione di Perugia
University of Perugia
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
University of Pisa
Scuola Normale Superiore di Pisa
Sezione di Roma
INFN Sezione di Torino
University of Turin
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
Korea University
Chonnam National University
University of Seoul
Hanyang University
Seoul National University
Vilnius University
University Malaya
International Islamic University of Malaysia
MOSTI
CINVESTAV-IPN
Consejo Nacional de Ciencia y Tecnología
Universidad Iberoamericana
Benemerita Universidad Autonoma de Puebla
Universidad Autónoma de San Luis Potosi
University of Auckland
University of Canterbury
National Centre for Nuclear Research
University of Warsaw
Warsaw University of Technology
Lisboa
Institute for Nuclear Research of the Russian Academy of Sciences
National Research Nuclear University MEPhI
Petersburg Nuclear Physics Institute (PNPI)
St. Petersburg State Polytechnical University
University of Florida
Moscow Institute of Physics and Technology
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
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
University of Belgrade
University of Belgrade
Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT)
Universidad Autónoma de Madrid
University of Oviedo
CSIC-Univ. Cantabria
Riga Technical University
Paul Scherrer Institut
University of Zurich
ETH Zurich
Stefan Meyer Institute for Subatomic Physics (SMI)
National Central University
National Taiwan University
Chulalongkorn University
Cukurova University
Istanbul Aydin University
Mersin University
Piri Reis University
Gaziosmanpasa University
Adiyaman University
Middle East Technical University (METU)
Izmir Institute of Technology
Necmettin Erbakan University
Bogazici University
Marmara University
Kafkas University
Istanbul Bilgi University
Istanbul Technical University
Academy of Science of Ukraine
Kharkov Institute of Physics and Technology
University of Bristol
Imperial College London
University of Puerto Rico
Monash University
Instituto de Astrofisica de Canarias
Brunel University London
Baylor University
Catholic University of America
University of Alabama
Boston University
Bethel University
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University of California, Riverside
University of California, San Diego
Florida State University
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Carnegie Mellon University
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Cornell University
Purdue University
Massachusetts Institute of Technology
Florida International University
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University of Illinois at Chicago
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Beykent University
Bingol University
Erzincan University
Sinop University
Mimar Sinan University
Johns Hopkins University
University of Kansas
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
University of Notre Dame
Rice University
The Ohio State University
Princeton University
Purdue University Northwest
University of Rochester
The Rockefeller University
Rutgers University–New Brunswick
University of Tennessee
Texas A&M University
Texas A&M University at Qatar
Vanderbilt University
Wayne State University
University of Wisconsin-Madison

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	140
Journal	European Physical Journal C
Volume	78
Issue number	2
DOIs	https://doi.org/10.1140/epjc/s10052-018-5607-5
Publication status	Published - 1 Feb 2018
Externally published	Yes

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10.1140/epjc/s10052-018-5607-5

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@article{6d6cbfc4de5d430ca636d16ebcffaf54,

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

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.",

author = "\{CMS Collaboration\} and Sirunyan, \{A. M.\} and A. Tumasyan and W. Adam and F. Ambrogi and E. Asilar and T. Bergauer and J. Brandstetter and E. Brondolin and M. Dragicevic and J. Er{\"o} and \{Escalante Del Valle\}, A. and M. Flechl and M. Friedl and R. Fr{\"u}hwirth and Ghete, \{V. M.\} and J. Grossmann and J. Hrubec and M. Jeitler and A. K{\"o}nig and N. Krammer and I. Kr{\"a}tschmer and D. Liko and T. Madlener and I. Mikulec and E. Pree and N. Rad and H. Rohringer and J. Schieck and R. Sch{\"o}fbeck and M. Spanring and D. Spitzbart and A. Taurok and W. Waltenberger and J. Wittmann and Wulz, \{C. E.\} and M. Zarucki and V. Chekhovsky and V. Mossolov and Gonzalez, \{J. Suarez\} and F. Beaudette and \{Granier de Cassagnac\}, R. and M. Nguyen and C. Ochando and P. Paganini and R. Salerno and Sauvan, \{J. B.\} and Y. Sirois and A. Zabi and A. Zghiche and \{De Wit\}, A.",

note = "Publisher Copyright: {\textcopyright} 2018, CERN for the benefit of the CMS collaboration.",

year = "2018",

month = feb,

day = "1",

doi = "10.1140/epjc/s10052-018-5607-5",

language = "English",

volume = "78",

journal = "European Physical Journal C",

issn = "1434-6044",

number = "2",

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TY - JOUR

T1 - Search for standard model production of four top quarks with same-sign and multilepton final states in proton–proton collisions at √s=13TeV

AU - CMS Collaboration

AU - Sirunyan, A. M.

AU - Tumasyan, A.

AU - Adam, W.

AU - Ambrogi, F.

AU - Asilar, E.

AU - Bergauer, T.

AU - Brandstetter, J.

AU - Brondolin, E.

AU - Dragicevic, M.

AU - Erö, J.

AU - Escalante Del Valle, A.

AU - Flechl, M.

AU - Friedl, M.

AU - Frühwirth, R.

AU - Ghete, V. M.

AU - Grossmann, J.

AU - Hrubec, J.

AU - Jeitler, M.

AU - König, A.

AU - Krammer, N.

AU - Krätschmer, I.

AU - Liko, D.

AU - Madlener, T.

AU - Mikulec, I.

AU - Pree, E.

AU - Rad, N.

AU - Rohringer, H.

AU - Schieck, J.

AU - Schöfbeck, R.

AU - Spanring, M.

AU - Spitzbart, D.

AU - Taurok, A.

AU - Waltenberger, W.

AU - Wittmann, J.

AU - Wulz, C. E.

AU - Zarucki, M.

AU - Chekhovsky, V.

AU - Mossolov, V.

AU - Gonzalez, J. Suarez

AU - Beaudette, F.

AU - Granier de Cassagnac, R.

AU - Nguyen, M.

AU - Ochando, C.

AU - Paganini, P.

AU - Salerno, R.

AU - Sauvan, J. B.

AU - Sirois, Y.

AU - Zabi, A.

AU - Zghiche, A.

AU - De Wit, A.

PY - 2018/2/1

Y1 - 2018/2/1

N2 - 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.

AB - 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.

U2 - 10.1140/epjc/s10052-018-5607-5

DO - 10.1140/epjc/s10052-018-5607-5

M3 - Article

AN - SCOPUS:85042446443

SN - 1434-6044

VL - 78

JO - European Physical Journal C

JF - European Physical Journal C

IS - 2

M1 - 140

ER -

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

Abstract

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