First estimates of the $(\alpha +\beta {)}^{\pi }$ from two--photon experiments

A. E. Kaloshin, V. M. Persikov, V. V. Serebryakov

We carry out the semi--model analysis of existing data on the angular distributions of the $\gamma \gamma \to {\pi }^{+}{\pi }^{-},{\pi }^0{\pi }^0$ reactions with purpose to obtain S-wave cross section a…