We present simulation studies in preparation for analyzing τ−→π−π+π−ντ in data from the Belle experiment at the KEK e+e− collider. Analyzing this decay can shed light on the a1(1260) and a1(1420) resonances and yield results that improve measurement of the τ electric and magnetic dipole moments. We show that we can achieve a higher signal efficiency than previous analyses of the same decay. We also demonstrate that neural networks can model our complicated six-dimensional background distributions and that quasi-model-independent partial-wave analysis can extract resonance masses, widths, and production amplitudes and phases.
