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Observation of H→bb¯ decays and VH production with the ATLAS detector
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.ORCID-id: 0000-0003-3867-0336
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.ORCID-id: 0000-0002-8015-7512
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.ORCID-id: 0000-0002-5935-7464
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Rekke forfattare: 29212018 (engelsk)Inngår i: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A search for the decay of the Standard Model Higgs boson into a bb¯ pair when produced in association with a W or Z boson is performed with the ATLAS detector. The data, corresponding to an integrated luminosity of 79.8fb−1 were collected in proton–proton collisions during Run 2 of the Large Hadron Collider at a centre-of-mass energy of 13TeV. For a Higgs boson mass of 125GeV, an excess of events over the expected background from other Standard Model processes is found with an observed (expected) significance of 4.9 (4.3) standard deviations. A combination with the results from other searches in Run 1 and in Run 2 for the Higgs boson in the bb¯ decay mode is performed, which yields an observed (expected) significance of 5.4 (5.5) standard deviations, thus providing direct observation of the Higgs boson decay into b-quarks. The ratio of the measured event yield for a Higgs boson decaying into bb¯ to the Standard Model expectation is 1.01±0.12(stat.)−0.15+0.16(syst.). Additionally, a combination of Run 2 results searching for the Higgs boson produced in association with a vector boson yields an observed (expected) significance of 5.3 (4.8) standard deviations.

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Elsevier, 2018.
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URN: urn:nbn:se:kth:diva-239552DOI: 10.1016/j.physletb.2018.09.013ISI: 000452318400011Scopus ID: 2-s2.0-85054174625OAI: oai:DiVA.org:kth-239552DiVA, id: diva2:1265754
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QC 20181126

Tilgjengelig fra: 2018-11-26 Laget: 2018-11-26 Sist oppdatert: 2019-01-07bibliografisk kontrollert

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Lund-Jensen, BengtOhm, ChristianRipellino, GiuliaSidebo, P. EdvinStrandberg, Jonas

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Physics Letters B

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