  The main experimental works, where dipole polarizabilities of charged pions
have been determined, are considered. Possible reasons for the differences
between the experimental data are discussed. In particular, it is shown that
the account of the $\sigma$-meson gives a significant correction to the value
of the polarizability obtained in the latest experiment of the COMPASS
collaboration. We present also new fit results for the
$(\gamma\gamma\to\pi\pi)$ reaction.
