Two photon decay and photoproduction of radial excitation of pion π0′

Within the framework of non-local quark model of Nambu-Jona-Lasinio type the two-photon decay of radial excited state of π0-meson - π0′ - is found to be 12 keV. The radial excitation of pion is described with the use of polynomial formfactor of second order over q→2 where q→ is the transverse momentum, which corresponds to relative motion of quark-antiquark pair within the energy range from 0 up to 1 GeV. The probabilities of production of π0′ and (π0′+γ) states in the electron-positron colliders are estimated. The production of π0′-meson in the interaction of photon with electron or muon is as well considered (Primakoff effect). The relevant total cross sections are 0.46 or 0.19 nb.