Decays ρ- → ηπ- and τ- → η(η′)π- ν in the Nambu-Jona-Lasinio model

The widths of the decays rho(-) -> eta pi(-) and tau(-) -> eta(eta')pi(-) nu are calculated in the framework of the Nambu-Jona-Lasinio 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 rho(-) -> eta pi(-) the intermediate scalar a(0)(-) state is taken into account. For the tau decays the intermediate states with a(0)(-), rho(-)(770) and rho(-) (1450) mesons are used. Our estimates are compared with the results obtained in other works.