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Scientific article
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English

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

ContributorsATLAS Collaboration
Published inPhysical review. D, vol. 105, no. 1, 012006
Publication date2022
First online date2022-01-11
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.

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Keywords
  • P p: scattering
  • P p: colliding beams
  • Higgs particle: rare decay
  • Higgs particle: decay modes
  • Higgs particle: mass
  • Resonance: production
  • Narrow resonance
  • Dimuon: resonance
  • Muon: pair production
  • Bottom: pair production
  • Higgs particle: branching ratio
  • Branching ratio: upper limit
  • Pseudoscalar particle: pair production
  • ATLAS
  • Dimuon: mass spectrum
  • Mass spectrum: (muon+ muon-)
  • CERN LHC Coll
  • Background
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Search for Higgs boson decays into a pair of pseudoscalar particles in the <i>bbμμ</i> final state with the ATLAS detector in <i>pp</i> collisions at √s = 13 TeV. In: Physical review. D, 2022, vol. 105, n° 1, p. 012006. doi: 10.1103/physrevd.105.012006
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Article (Published version)
Identifiers
ISSN of the journal2470-0010
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