An anomalous -ω interference in the reaction ee → 3π

It is shown that in the π⁺π⁻ meson mass-spectrum in the reaction e⁺e⁻ → π⁺π⁻π⁰ at 2E > 1 GeV one should expect the anomalously large effect of the -ω interference. It can be used as a tool for the elucidation of the details of the e⁺e⁻ → Vπ reaction dynamics and as the additional possibility for the determination of the electromagnetic -ω mixing parameters.