The processes $e^{+}{e}^{-}\to \pi \pi ({\pi }^{\mathrm{\prime }})$ in the extended NJL model

The process $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}$ is described in the framework of the extended NJL model. Intermediate vector mesons ${\rho }^0(770)$, $\omega (782)$ and \rho’(1450)$ are taken into account. Our results are in satisfactory agreement with experimental data. The prediction for the process $e^{+}e^{-} \to \pi\pi’(1300)$ is given. Here the main contribution is given by the diagram with intermediate ${\rho }^{\mathrm{\prime }}(1450)$ meson.