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

, The ATLAS collaboration (2018) Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector. Physics Letters B, 784. pp. 173-191. ISSN 0370-2693

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Abstract

The observation of Higgs boson production in association with a top quark pair (tt¯H), based on the analysis of proton–proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider, is presented. Using data corresponding to integrated luminosities of up to 79.8 fb−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¯tH searches using a dataset corresponding to integrated luminosities of 4.5 fb−1at 7TeVand 20.3 fb−1at 8TeV,the observed (expected) significance is 6.3 (5.1) standard deviations. Assuming Standard Model branching fractions, the total t¯tH production cross section at 13 TeV is measured to be 670 ± 90 (stat.)+110−100(syst.) fb, in agreement with the Standard Model prediction.

Item Type:
Journal Article
Journal or Publication Title:
Physics Letters B
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
128021
Deposited By:
Deposited On:
04 Oct 2018 11:22
Refereed?:
Yes
Published?:
Published
Last Modified:
27 Oct 2020 08:26