The second-class current decays τ→πη(η′)ντ in the NJL model including the interaction of mesons in the final state.

The effect of the interaction of mesons in the final state is additionally considered within the description of τ → π η (η ′) ν τ decays. This interaction is taken into account at the level of production of intermediate pions. One of them, in turn, might be transited into η or η ′ mesons. Our results do not exceed the experimentally established branching fractions, and they are in agreement with the results of other theoretical studies. [ABSTRACT FROM AUTHOR]