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.
πe2”) rate. Overlaid are π+→aeν (“πa3
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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.