FCC-ee can reach ALP-photon couplings of a few 10^{-6} GeV^{-1} at the Z pole and 10^{-5} GeV^{-1} at higher runs for masses 5-320 GeV in the associated production plus diphoton decay channel.
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FCC-ee at 240 GeV with 10.8 ab^{-1} could set a 95% CL upper limit of 0.15% on the branching ratio of Higgs to invisible particles.
citing papers explorer
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Sensitivity of the FCC-ee to axion-like particles at different center-of-mass energies
FCC-ee can reach ALP-photon couplings of a few 10^{-6} GeV^{-1} at the Z pole and 10^{-5} GeV^{-1} at higher runs for masses 5-320 GeV in the associated production plus diphoton decay channel.
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Prospects for Measuring $H\to \rm{invisble}$ at the FCCee
FCC-ee at 240 GeV with 10.8 ab^{-1} could set a 95% CL upper limit of 0.15% on the branching ratio of Higgs to invisible particles.