51�������

Abstract:

The resonant structure of the four pion final state in the decay τ→3ππ⁰ντ 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→3ππ⁰ντ 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→ωπντ spectral function. We have searched for second class currents in the decay τ→ωπντ using spin-parity analysis and established an upper limit on the non-vector current contribution. ©2000 The American Physical Society.

Abstract:

We present an update of the search for the lepton family number violating decay τ→μγ using 12.6 million τ⁺τ^- pairs collected with the CLEO detector. No evidence of a signal has been found and the corresponding upper limit is script B sign(τ→μγ)<1.1×10^-6 at 90% C.L., significantly smaller than previous experimental limits. ©2000 The American Physical Society.