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Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector
Univ Mohamed Premier, Fac Sci, Oujda, Morocco.;LPTPM, Oujda, Morocco..
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0001-6945-1916
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0003-3867-0336
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8015-7512
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Number of Authors: 29202018 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 784, p. 173-191Article in journal (Refereed) Published
Abstract [en]

The observation of Higgs boson production in association with a top quark pair (t (t) over barH), 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) over bar, WW*, tau(+)tau(-), gamma gamma, and ZZ*, the observed significance is 5.8 standard deviations, compared to an expectation of 4.9 standard deviations. Combined with the t (t) over barH 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 t (t) over barH production cross section at 13 TeV is measured to be 670 +/- 90(stat.)(-100)(+110)(syst.) fb, in agreement with the Standard Model prediction.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2018. Vol. 784, p. 173-191
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Subatomic Physics
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URN: urn:nbn:se:kth:diva-237743DOI: 10.1016/j.physletb.2018.07.035ISI: 000445781600029Scopus ID: 2-s2.0-85051211826OAI: oai:DiVA.org:kth-237743DiVA, id: diva2:1259591
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QC 20181030

Available from: 2018-10-30 Created: 2018-10-30 Last updated: 2019-08-08Bibliographically approved

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Kastanas, Konstatinos A.Lund-Jensen, BengtOhm, ChristianRipellino, GiuliaSidebo, P. EdvinStrandberg, Jonas

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