FCC-ee can probe ALP-photon couplings down to a few 10^{-6} GeV^{-1} at the Z pole and ~10^{-5} GeV^{-1} at higher energies for ALP masses 5-320 GeV in the three-photon channel.
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Sensitivity of the FCC-ee to axion-like particles at different center-of-mass energies
FCC-ee can probe ALP-photon couplings down to a few 10^{-6} GeV^{-1} at the Z pole and ~10^{-5} GeV^{-1} at higher energies for ALP masses 5-320 GeV in the three-photon channel.