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Presented is the search for anomalous Higgs boson decays into two axion-likeparticles (ALPs) using the full Run 2 data set of 140 fb$^{-1}$ ofproton-proton collisions at a centre-of-mass energy of 13 TeV recorded by theATLAS experiment. The ALPs are assumed to decay into two photons, providingsensitivity to recently proposed models that could explain the $(g-2)_\mu$discrepancy. This analysis covers an ALP mass range from 100 MeV to 62 GeV andALP-photon couplings in the range $10^{-5}\,\text{TeV}^{-1}<C_{a\gamma\gamma}/\Lambda<1\, \text{TeV}^{-1}$, and thereforeincludes signatures with significantly displaced vertices and highly collinearphotons. No significant excess of events above the Standard Model background isobserved. Upper limits at 95% confidence level are placed on the branchingratio of the Higgs boson to two ALPs in the four-photon final state, and are inthe range of $ 10^{-5}$ to $3\times 10^{-2}$, depending on the hypothesized ALPmass and ALP-photon coupling strength.

Search for short- and long-lived axion-like particles in $H\rightarrow a a \rightarrow 4\gamma$ decays with the ATLAS experiment at the LHC