We have deﬁned dimensionless form factors f+,0 =f+,0(q2), such that f0 couples only to the lepton mass

+ (f0−f+)m2 +−m2 0 q2 qµ ] , in which q = p+−p0, the diﬀerence of the charged, neutral pseudoscalar momenta, with massesm+ andm0, respectively

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hep-ph · 2019-08-30 · accept · novelty 6.0

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.

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Constraining axion-like particles from rare pion decays hep-ph · 2019-08-30 · accept · none · ref 1
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.