Electromagnetic transition form factor and decays of neutral pions
In this talk we will discuss two important processes of the low-energy hadron physics: the rare decay $\pi^0\to e^+ e^-$ and the Dalitz decay of $\pi^0$.
We briefly summarize experimental and theoretical results on the decay $\pi^0\to e^+e^−$. The analytical two-loop QED corrections together with the bremsstrahlung contribution beyond the soft-photon approximation are reviewed.
Finally, we present the Two-hadron saturation (THS) scenario for the PVV correlator and apply it to the processes under discussion.
The obtained results can be also used in a theoretical calculation of the hadronic light-by-light scattering contribution to the $g−2$ type experiments.