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

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dc.contributor.authorAaboud, M.
dc.contributor.authorAad, G.
dc.contributor.authorAbbott, B.
dc.contributor.authorAbdinov, O.
dc.contributor.authorAbeloos, B.
dc.contributor.authorAbhayasinghe, D.K.
dc.contributor.authorAbidi, S.H.
dc.contributor.authorAbouZeid, O.S.
dc.contributor.authorAbraham, N.L.
dc.contributor.authorAbramowicz, H.
dc.contributor.authorAbreu, H.
dc.contributor.authorAbulaiti, Y.
dc.contributor.authorAcharya, B.S.
dc.contributor.authorAdachi, S.
dc.contributor.authorAdamczyk, L.
dc.contributor.authorAdelman, J.
dc.contributor.authorAdersberger, M.
dc.contributor.authorAdiguzel, A.
dc.contributor.authorAdye, T.
dc.contributor.authorAffolder, A.A.
dc.contributor.authoret al.
dc.date.issued2018
dc.description.abstractThe 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.
dc.description.statementofresponsibilityM. Aaboud … Damir Duvnjak … Paul D. Jackson … Jason L. Oliver … Andreas Petridis … Abhishek Sharma … Martin White … et al. (The ATLAS Collaboration)
dc.identifier.citationPhysics Letters B, 2018; 784:173-191
dc.identifier.doi10.1016/j.physletb.2018.07.035
dc.identifier.issn0370-2693
dc.identifier.issn1873-2445
dc.identifier.urihttp://hdl.handle.net/2440/124542
dc.language.isoen
dc.publisherElsevier
dc.rights©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.
dc.source.urihttps://doi.org/10.1016/j.physletb.2018.07.035
dc.titleObservation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector
dc.typeJournal article
pubs.publication-statusPublished

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