Search for Higgs boson decays into a pair of pseudoscalar particles in the bbμμ final state with the ATLAS detector in pp collisions at √s=13 TeV

ATLAS Collaboration, Paul Newman

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Abstract

This paper presents a search for decays of the Higgs boson with a mass of 125 GeV into a pair of new pseudoscalar particles, H → aa , where one a-boson decays into a b-quark pair and the other into a muon pair. The search uses 139  fb-1 of proton-proton collision data at a center-of-mass energy of √s = 13  TeV recorded between 2015 and 2018 by the ATLAS experiment at the LHC. A narrow dimuon resonance is searched for in the invariant mass spectrum between 16 GeV and 62 GeV. The largest excess of events above the Standard Model backgrounds is observed at a dimuon invariant mass of 52 GeV and corresponds to a local (global) significance of 3.3σ ( 1.7σ ). Upper limits at 95% confidence level are placed on the branching ratio of the Higgs boson to the bbμμ final state, B(H → aa → bbμμ), and are in the range 0.2–4.0 × 10−4, depending on the signal mass hypothesis.
Original languageEnglish
Article number012006
Number of pages29
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume105
Issue number1
DOIs
Publication statusPublished - 1 Jan 2022

Bibliographical note

44 pages in total, author list starting page 28, 12 figures, 3 tables, published in PRD. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2021-03/

Keywords

  • hep-ex

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