The Structure Functions of Real Photon at Low Virtualities

The structure functions F_2 and F_1 of real photon at low virtualities are calculated in the framework of chiral perturbation theory (ChPT) in the zero and first order of ChPT. It is assumed that the virtuality of hard projectile photon Q^2 is much less than the characteristic ChPT scale. The numerical results for F_2 and F_1 are presented.