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

Barton, Adam Edward and Bertram, Iain Alexander and Borissov, Guennadi and Bouhova-Thacker, Evelina Vassileva and Fox, Harald and Henderson, Robert Charles William and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin Eamonn and Love, Peter Allan and Muenstermann, Daniel Matthias Alfred and Parker, Adam Jackson and Smizanska, Maria and Tee, Amy and Walder, James William and Wharton, Andrew Mark and Whitmore, Ben (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:
07 Apr 2020 05:39