Measurement of the presence of a₁(1420) and ω(782) in τ⁻→π⁻π⁻π⁺ν_τ at Belle

We present preliminary results of a partial-wave analysis of τ⁻→π⁻π⁻π⁺ν_τ using data from the Belle experiment at the KEKB e⁺e⁻ collider. We validate our analysis with a model-independent one. We see an a₁(1420) resonance and a G-parity violating 1⁻[ω(782)π]P] wave in tauon decays. Our results will improve models used in simulation studies necessary for measuring the tauon electric and magnetic dipole moments and Michel parameters.