The decays ρ⁻→ηπ⁻ and τ⁻→η(η')π⁻ν in the NJL model

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The widths of the decays ρ⁻→ηπ⁻ and τ⁻→η(η')π⁻ν are calculated in the framework of the NJL model. It is shown that these decays are defined by the u and d quark mass difference. It leads to the suppression of these decays in comparison with the main decay modes. In the process ρ⁻→ηπ⁻ the intermediate scalar a₀⁻ state is taken into account. For the τ decays the intermediate states with a₀⁻, ρ⁻(770) and ρ⁻(1450) mesons are used. Our estimates are compared with the results obtained in other works.