Two photon decay and photoproduction of radial excitation of pion ${\pi }_0^{\prime }$

E. A. Kuraev, M. K. Volkov

Within the framework of non-local quark model of Nambu--Jona-Lasinio type the two-photon decay of radial excited state of ${\pi }_0$-meson -- ${\pi }_0^{\prime }$ -- is found to be $3.6\KeV$. The rad…