Existing PIENU and PIBETA rare pion decay data constrain ALP-pion mixing to sin^2 theta below about 1e-5 for ALP masses from 10 MeV to the pion mass.
Axion-like Particles from Primakov production in beam-dumps
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We discuss searches for Axion-like Particles which are coupled predominantly to photons from proton- or electron beam-dumps. In particular, we scrutinize the present state of exclusions from SLAC 141 in the mass range of $\sim$ 10-30 MeV
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Constraining axion-like particles from rare pion decays
Existing PIENU and PIBETA rare pion decay data constrain ALP-pion mixing to sin^2 theta below about 1e-5 for ALP masses from 10 MeV to the pion mass.