Low-energy processes of meson production in the extended Nambu-Jona-Lasinio model

The processes of meson production in electron-positron collisions at low energies are characterized within the extended Nambu-Jona-Lasinio model. It is demonstrated that intermediate vector mesons (both in the ground state and in the first radially excited one) play a critical part in these processes. The obtained results are in reasonable agreement with the available experimental data. A number of theoretical predictions are made, which can be tested experimentally in the near future.