Measurement of the presence of a₁ (1420) and (782) in ^-^-^-^+_ at Belle

We present preliminary results of a partial-wave analysis of ^-^-^-^+_ 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^- (782) 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.