Resonant structure of τ→ππ⁰ν_τ and τ→ωπν_τ decays

The resonant structure of the four pion final state in the decay τ→3ππ⁰ν_τ has been analyzed using 4.27 million τ⁺τ^- pairs collected by the CLEO II experiment at the Cornell Electron Storage Ring. A partial wave analysis of the resonant structure of the ô-»3 τ→3ππ⁰ν_τ decay has been performed; the spectral decomposition of the four pion system is dominated by the ωπ and a₁π final states. The mass and width of the ρ′ resonance have been extracted from a fit to the τ→ωπν_τ spectral function. We have searched for second class currents in the decay τ→ωπν_τ using spin-parity analysis and established an upper limit on the non-vector current contribution.