\cl{\bf $τ\rightarrowμμ{\barμ}$ and $τ\rightarrowμe{\bar e}$ Decays in String Models with $\e6$ Symmetry

Abstract

A detailed analysis on the rare $τ$ decay {\it via} $\taumue$ and $\taumus$ in the string models with $\e6$ symmetry is reported. It is found that $Γ(\taumue)\sim(6-7)Γ(\taumus)$ and these rates are in general about 1000 times less than that of $Γ(μ\rightarrow eγ)$. It is also found that the out-going muon in $\taumue$ is almost 100\% right-handed polarized and the out-going electrons would be predominately parallel to each other. These decay processes may be accessible at the SSC.