Observation of four top quark production in proton-proton collisions at $\sqrt{s}$ = 13 TeV

  • P. Volkov (Contributor)
  • M. Kirakosyan (Contributor)
  • Mayda Velasco (Contributor)
  • S. Giani (Contributor)
  • P. S. Chen (Contributor)
  • A. K. Das (Contributor)
  • F. Rehm (Contributor)
  • D. Leggat (Contributor)
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  • G. R. Snow (Contributor)
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  • J. P. Merlo (Contributor)
  • J. Bueghly (Contributor)
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  • M. I.M. Awan (Contributor)
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  • T. Tuuva (Contributor)
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  • M. Mrowietz (Contributor)
  • G. Mantovani (Contributor)
  • S. B. Beri (Contributor)
  • T. Chatzistavrou (Contributor)
  • M. Kadastik (Contributor)
  • S. Freed (Contributor)
  • F. Colombina (Contributor)
  • L. Ceard (Contributor)
  • V. Scheurer (Contributor)
  • W. Y. Wong (Contributor)
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  • W. Zhang (Contributor)
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  • T. Sheokand (Contributor)
  • M. Gordon (Contributor)
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  • L. H. Vage (Contributor)
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  • Y. Nissan (Contributor)
  • D. Y. Kang (Contributor)
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  • D. Grove (Contributor)
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  • S. Malik (Contributor)
  • B. S. Pinolini (Contributor)
  • J. Mariano (Contributor)
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  • P. Keicher (Contributor)
  • B. Ko (Contributor)
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  • J. Rander (Contributor)
  • Y. Roh (Contributor)
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  • M. Barrio Luna (Contributor)
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  • O. Neogi (Contributor)

Dataset

Description

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 138 $\text{fb}^{-1}$.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 $17.6^{+3.7}_{-3.5} \text{(stat)} ^{+2.3}_{-1.9} \text{(syst)}$, in agreement with the available theoretical predictions.
Date made available2023
PublisherHEPData

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