Pion transition form factor: interplay of hard and soft limits

A. E. Dorokhov

The behaviour of the pion transition form factor for the process ${\gamma }^{\star }\gamma \to {\pi }^0$ and ${\gamma }^{\star }{\gamma }^{\star }\to {\pi }^0$ at space-like values of photon momenta is estimated within the nonloc…