Search for short- and long-lived axion-like particles in H→aa→4γ decays with the ATLAS experiment at the LHC

ATLAS Collaboration [email protected]

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1 Citation (Scopus)

Abstract

Presented is the search for anomalous Higgs boson decays into two axion-like particles (ALPs) using the full Run 2 data set of 140fb-1 of proton-proton collisions at a centre-of-mass energy of 13TeV recorded by the ATLAS experiment. The ALPs are assumed to decay into two photons, providing sensitivity to recently proposed models that could explain the (g-2)μ discrepancy. This analysis covers an ALP mass range from 100 to 62GeV and ALP-photon couplings in the range 10-7TeV-1<Caγγ/Λ<1TeV-1, and therefore includes signatures with significantly displaced vertices and highly collinear photons. No significant excess of events above the Standard Model background is observed. Upper limits at 95% confidence level are placed on the branching ratio of the Higgs boson to two ALPs in the four-photon final state, and are in the range of 10-5 to 3×10-2, depending on the hypothesized ALP mass and ALP-photon coupling strength.

Original languageEnglish
Article number742
JournalEuropean Physical Journal C
Volume84
Issue number7
DOIs
Publication statusPublished - Jul 2024

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

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