Sommaire:

Light Axion-like particles (ALPs) with masses below 1 MeV are strongly constrained by cosmological and beam-dump experiments. The parameter space for heavier ALPs however is largely unconstrained. I will review the current bounds and argue, that collider probes and in particular the exotic Higgs decays h→Za and h→aa can test many orders of magnitude of so far unconstrained parameter space for a variety of ALP decays. Almost the complete region in which ALPs can explain the anomalous magnetic moment of the muon can be probed by searches for these decays with subsequent decay a→γγ even if the relevant couplings are loop suppressed and the a→γγ branching ratio is less than~1.

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