J. Novotny

Rare decay π 0 → e + e − : on corrections beyond the leading order

The preceding experimental and theoretical results on the rare decay

Construction of the eta->3pi (and K->3pi) amplitudes using dispersive approach

\pi ^0\rightarrow e^+e^-

The eta->pi^0 pi^0 gamma gamma decay in generalized chiral perturbation theory

π0→e+e- are briefly summarized. Already computed two-loop QED corrections are reviewed and the bremsstrahlung contribution beyond the soft-photon approximation is analytically calculated. The possible further contribution of QCD loop corrections is estimated using the leading logarithm approximation. The complete result can be used to fit the value of the contact interaction coupling

Some aspects of Dalitz decay pi0 -> e+ e- gamma

\chi ^\text {(r)}

Dalitz崩壊π0→e+e‐γについての再論

χ(r) to the recent KTeV experiment with the result