Observation of H → bb‾ decays and VH production with the ATLAS detector

ATLAS Collaboration

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Abstract

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 13 TeV. For a Higgs boson mass of 125 GeV, 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.)+0.16-0.15(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.
Original languageEnglish
Pages (from-to)59-86
Number of pages28
JournalPhysics Letters B
Volume786
Early online date14 Sep 2018
DOIs
Publication statusPublished - 10 Nov 2018

Bibliographical note

56 pages in total, author-list starts on page 40, 8 figures, 13 tables, submitted to Phys. Lett. B, all figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2018-04/

Keywords

  • hep-ex

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