2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/227920We use experimental data on $e^+e^- \to η(η^{\prime})π^+π^-$ and conservation of vector current to estimate the branching fractions of $τ^-$ decay to $η(η^{\prime})π^-π^0ν_τ$. The obtained values are compared to the experimental results.4 pages, 2 figures, Talk at the X Workshop on τLepton Physics, NovosibirskHigh Energy Physics - Experimenttext