Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector
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Date
2018
Authors
Aaboud, M.
Aad, G.
Abbott, B.
Abdinov, O.
Abeloos, B.
Abhayasinghe, D.K.
Abidi, S.H.
AbouZeid, O.S.
Abraham, N.L.
Abramowicz, H.
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Journal article
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Physics Letters B, 2018; 784:173-191
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M. Aaboud … Damir Duvnjak … Paul D. Jackson … Jason L. Oliver … Andreas Petridis … Abhishek Sharma … Martin White … et al. (The ATLAS Collaboration)
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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 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 ̄tHsearches 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 ̄tHproduction cross section at 13 TeV is measured to be 670±90 (stat.)+110−100(syst.) fb, in agreement with the Standard Model prediction.
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©2018 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.