The resonant structure of the four pion final state in the decay {tau}{yields}3{pi}{pi}{sup 0}{nu}{sub {tau}} has been analyzed using 4.27 million {tau}{sup +}{tau}{sup -} pairs collected by the CLEO II experiment at the Cornell Electron Storage Ring. A partial wave analysis of the resonant structure of the {tau}{yields}3{pi}{pi}{sup 0}{nu}{sub {tau}} decay has been performed; the spectral decomposition of the four pion system is dominated by the {omega}{pi} and a{sub 1}{pi} final states. The mass and width of the {rho}{sup '} resonance have been extracted from a fit to the {tau}{yields}{omega}{pi}{nu}{sub {tau}} spectral function. We have searched for second class currents in the decay {tau}{yields}{omega}{pi}{nu}{sub {tau}} using spin-parity analysis and established an upper limit on the non-vector current contribution. (c) 2000 The American Physical Society.
