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

Research output: Contribution to journalArticle

M. Aaboud, Bobby Samir Acharya, ATLAS Collaboration

Original languageEnglish
Pages (from-to)173-191
Number of pages19
JournalPhys. Lett. B
VolumeB784
Early online date24 Jul 2018
DOIs
Publication statusPublished - 10 Sep 2018

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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 bb¯, ⁎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 tt¯H searches using a dataset corresponding to integrated luminosities of 4.5 fb−1 at 7 TeV and 20.3 fb−1 at 8 TeV, the observed (expected) significance is 6.3 (5.1) standard deviations. Assuming Standard Model branching fractions, the total tt¯H production cross section at 13 TeV is measured to be 670 ± 90 (stat.) −100+110 (syst.) fb, in agreement with the Standard Model prediction.

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