The electromagnetic 2γ decays of the neutral pseudoscalar mesons are discussed in the context of broken SU(3)×SU(3) and anomalous partial conservation of axial-vector current (PCAC). Particular attention is paid to the mixed ηX channel. It is predicted that the X width is enhanced beyond 80 keV. The observed value for the η width is used to compute (FKF_π)²≈1.3.
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Glashow et al. (1969) studied this question.
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