The process $e^+e^- \to η(η')2π$ in the extended NJL model

Process of electron-positron annihilation into $η(η')2π$ is described within the extended NJL model in the energy range up to about 2 GeV. Contributions of intermediate vector mesons $ρ(770)$ and $ρ(1450)$ are taken into account. Results for the $\eta2π$ channel are found to be in a reasonable agreement with experimental data. Predictions for production of $η' 2π$ are given. The corresponding estimations for decays $τ\toη(η')2πν$ are given in Appendix.

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