Observation of four top quark production in proton-proton collisions at s=13TeV

The CMS collaboration

doi:10.1016/j.physletb.2023.138290

Observation of four top quark production in proton-proton collisions at s=13TeV

The CMS collaboration

CERN
Yerevan Physics Institute
Institut für Hochenergiephysik der OeAW
Indian Institute of Technology Madras
University of Antwerp
Vrije Universiteit Brussel
Université Libre de Bruxelles
Korea University
Ghent University
Université catholique de Louvain
Centro Brasileiro de Pesquisas Fisicas
Universidade do Estado do Rio de Janeiro
Universidade Estadual Paulista Júlio de Mesquita Filho
Bulgarian Academy of Sciences
University of Sofia
Universidad de Tarapacá
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Tsinghua University
Institute of High Energy Physics Chinese Academy of Science
California Institute of Technology
University of Florida
Massachusetts Institute of Technology
Peking University
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University of Science and Technology of China
Fudan University
Rice University
Zhejiang University
Universidad de los Andes Colombia
Universidad de Antioquia
University of Split
Faculty of Science, University of Split
Institute Rudjer Boskovic
University of Cyprus
Charles University
Escuela Politecnica Nacional
Universidad San Francisco de Quito
Egyptian Network of High Energy Physics
Fayoum University
National Institute of Chemical Physics and Biophysics, Tallinn
University of Helsinki
Helsinki Institute of Physics
Lappeenranta University of Technology
Université Paris-Saclay
Laboratoire Leprince-Ringuet
Institut Pluridisciplinaire Hubert Curien
Institut de Physique des 2 Infinis de Lyon
Seoul National University
Georgian Technical University
RWTH Aachen University
Tata Institute of Fundamental Research, Mumbai
Deutsches Elektronen-Synchrotron (DESY)
Saha Institute of Nuclear Physics
Northwestern University
University of Kansas
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University of Debrecen
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University College Dublin
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University of California at Santa Barbara
Sungkyunkwan University
Texas Tech University
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Imperial College London
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65 Citas (Scopus)

Resumen

The observation of the production of four top quarks in proton-proton collisions is reported, based on a data sample collected by the CMS experiment at a center-of-mass energy of 13 TeV in 2016–2018 at the CERN LHC and corresponding to an integrated luminosity of 138fb⁻¹. Events with two same-sign, three, or four charged leptons (electrons and muons) and additional jets are analyzed. Compared to previous results in these channels, updated identification techniques for charged leptons and jets originating from the hadronization of b quarks, as well as a revised multivariate analysis strategy to distinguish the signal process from the main backgrounds, lead to an improved expected signal significance of 4.9 standard deviations above the background-only hypothesis. Four top quark production is observed with a significance of 5.6 standard deviations, and its cross section is measured to be 17.7_−3.5^+3.7(stat)_−1.9^+2.3(syst)fb, in agreement with the available standard model predictions.

Idioma original	Inglés
Número de artículo	138290
Publicación	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volumen	847
DOI	https://doi.org/10.1016/j.physletb.2023.138290
Estado	Publicada - 10 dic. 2023
Publicado de forma externa	Sí

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title = "Observation of four top quark production in proton-proton collisions at s=13TeV",

abstract = "The observation of the production of four top quarks in proton-proton collisions is reported, based on a data sample collected by the CMS experiment at a center-of-mass energy of 13 TeV in 2016–2018 at the CERN LHC and corresponding to an integrated luminosity of 138fb−1. Events with two same-sign, three, or four charged leptons (electrons and muons) and additional jets are analyzed. Compared to previous results in these channels, updated identification techniques for charged leptons and jets originating from the hadronization of b quarks, as well as a revised multivariate analysis strategy to distinguish the signal process from the main backgrounds, lead to an improved expected signal significance of 4.9 standard deviations above the background-only hypothesis. Four top quark production is observed with a significance of 5.6 standard deviations, and its cross section is measured to be 17.7−3.5+3.7(stat)−1.9+2.3(syst)fb, in agreement with the available standard model predictions.",

keywords = "CMS, Top quark",

author = "\{The CMS collaboration\} and A. Hayrapetyan and A. Tumasyan and W. Adam and Andrejkovic, \{J. W.\} and T. Bergauer and S. Chatterjee and K. Damanakis and M. Dragicevic and \{Escalante Del Valle\}, A. and Hussain, \{P. S.\} and M. Jeitler and N. Krammer and D. Liko and I. Mikulec and J. Schieck and R. Sch{\"o}fbeck and D. Schwarz and M. Sonawane and S. Templ and W. Waltenberger and Wulz, \{C. E.\} and Darwish, \{M. R.\} and T. Janssen and \{Van Mechelen\}, P. and Bols, \{E. S.\} and J. D'Hondt and S. Dansana and \{De Moor\}, A. and M. Delcourt and \{El Faham\}, H. and S. Lowette and I. Makarenko and D. M{\"u}ller and Sahasransu, \{A. R.\} and S. Tavernier and M. Tytgat and \{Van Putte\}, S. and D. Vannerom and B. Clerbaux and \{De Lentdecker\}, G. and L. Favart and D. Hohov and J. Jaramillo and A. Khalilzadeh and K. Lee and M. Mahdavikhorrami and A. Malara and S. Paredes and L. P{\'e}tr{\'e} and N. Postiau",

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year = "2023",

month = dec,

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doi = "10.1016/j.physletb.2023.138290",

language = "Ingl{\'e}s",

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journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

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T1 - Observation of four top quark production in proton-proton collisions at s=13TeV

AU - The CMS collaboration

AU - Hayrapetyan, A.

AU - Tumasyan, A.

AU - Adam, W.

AU - Andrejkovic, J. W.

AU - Bergauer, T.

AU - Chatterjee, S.

AU - Damanakis, K.

AU - Dragicevic, M.

AU - Escalante Del Valle, A.

AU - Hussain, P. S.

AU - Jeitler, M.

AU - Krammer, N.

AU - Liko, D.

AU - Mikulec, I.

AU - Schieck, J.

AU - Schöfbeck, R.

AU - Schwarz, D.

AU - Sonawane, M.

AU - Templ, S.

AU - Waltenberger, W.

AU - Wulz, C. E.

AU - Darwish, M. R.

AU - Janssen, T.

AU - Van Mechelen, P.

AU - Bols, E. S.

AU - D'Hondt, J.

AU - Dansana, S.

AU - De Moor, A.

AU - Delcourt, M.

AU - El Faham, H.

AU - Lowette, S.

AU - Makarenko, I.

AU - Müller, D.

AU - Sahasransu, A. R.

AU - Tavernier, S.

AU - Tytgat, M.

AU - Van Putte, S.

AU - Vannerom, D.

AU - Clerbaux, B.

AU - De Lentdecker, G.

AU - Favart, L.

AU - Hohov, D.

AU - Jaramillo, J.

AU - Khalilzadeh, A.

AU - Lee, K.

AU - Mahdavikhorrami, M.

AU - Malara, A.

AU - Paredes, S.

AU - Pétré, L.

AU - Postiau, N.

PY - 2023/12/10

Y1 - 2023/12/10

N2 - The observation of the production of four top quarks in proton-proton collisions is reported, based on a data sample collected by the CMS experiment at a center-of-mass energy of 13 TeV in 2016–2018 at the CERN LHC and corresponding to an integrated luminosity of 138fb−1. Events with two same-sign, three, or four charged leptons (electrons and muons) and additional jets are analyzed. Compared to previous results in these channels, updated identification techniques for charged leptons and jets originating from the hadronization of b quarks, as well as a revised multivariate analysis strategy to distinguish the signal process from the main backgrounds, lead to an improved expected signal significance of 4.9 standard deviations above the background-only hypothesis. Four top quark production is observed with a significance of 5.6 standard deviations, and its cross section is measured to be 17.7−3.5+3.7(stat)−1.9+2.3(syst)fb, in agreement with the available standard model predictions.

AB - The observation of the production of four top quarks in proton-proton collisions is reported, based on a data sample collected by the CMS experiment at a center-of-mass energy of 13 TeV in 2016–2018 at the CERN LHC and corresponding to an integrated luminosity of 138fb−1. Events with two same-sign, three, or four charged leptons (electrons and muons) and additional jets are analyzed. Compared to previous results in these channels, updated identification techniques for charged leptons and jets originating from the hadronization of b quarks, as well as a revised multivariate analysis strategy to distinguish the signal process from the main backgrounds, lead to an improved expected signal significance of 4.9 standard deviations above the background-only hypothesis. Four top quark production is observed with a significance of 5.6 standard deviations, and its cross section is measured to be 17.7−3.5+3.7(stat)−1.9+2.3(syst)fb, in agreement with the available standard model predictions.

KW - CMS

KW - Top quark

UR - https://www.scopus.com/pages/publications/85182843712

U2 - 10.1016/j.physletb.2023.138290

DO - 10.1016/j.physletb.2023.138290

M3 - Artículo

AN - SCOPUS:85182843712

SN - 0370-2693

VL - 847

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 138290

ER -

Observation of four top quark production in proton-proton collisions at s=13TeV

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