τ→μμ bar μ and τ→μe bar e decays in string models with E6 symmetry

A detailed analysis of the rare τ decay via τ→μe bar e and τ→μμ bar μ in the string models with E6 symmetry is reported. It is found that Γ(τ→μe bar e)∼(6--7)Γ(τ→μμ bar μ) and these rates are in general about 1000 times less than that of Γ(μ→eγ). It is also found that the outgoing muon in τ→μe bar e is almost 100% right-handed polarized and the outgoing electrons would be predominantly parallel to each other. These decay processes may be accessible at the Superconducting Super Collider