Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector

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Abstract

The observation of Higgs boson production in association with a top quark pair (t¯tH), based on the analysis of proton–proton collision data at a centre-of-mass energy of 13TeVrecorded with the ATLAS detector at the Large Hadron Collider, is presented. Using data corresponding to integrated luminosities of up to 79.8fb−1, and considering Higgs boson decays into b¯b, WW∗, τ+τ−, γγ, and ZZ∗, the observed significance is 5.8 standard deviations, compared to an expectation of 4.9 standard deviations. Combined with the t¯tHsearches using a dataset corresponding to integrated luminosities of 4.5fb−1at 7TeVand 20.3fb−1at 8TeV, the observed (expected) significance is 6.3 (5.1) standard deviations. Assuming Standard Model branching fractions, the total t¯tHproduction cross section at 13TeVis measured to be 670±90(stat.)+110−100(syst.)fb, in agreement with the Standard Model prediction.

Journal

  • Physics letters. B

    Physics letters. B (784), 173-191, 2018-09

    Elsevier

Keywords

Codes

  • NII Article ID (NAID)
    120006542239
  • NII NACSIS-CAT ID (NCID)
    AA00774026
  • Text Lang
    ENG
  • Article Type
    journal article
  • ISSN
    0370-2693
  • Data Source
    IR 
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