CLEO Results on Tau Michel Parameters

Abstract

We present measurements of the tau Michel Parameters made by the CLEO experiment. Three different analyses are performed: a spin-independent lepton spectrum analysis and a second spin-dependent analysis using $\ell^\pm$ \vs\ $π^\mpπ^0$ events, and a third spin-dependent analysis using $π^+$ \vs\ $π^-$ events. the results are used to derive limits on the general four-fermion couplings, the mass of the charged Higgs in the MSSM, and a right-handed $W$ in left-right models. Many of these measurements are more precise than the PDG world averages.