Search for excited taus from Z\u3csup\u3e0\u3c/sup\u3e decays

\u3cp\u3eWe have searched for excited taus from Z\u3csup\u3e0\u3c/sup\u3e decay in the channels e\u3csup\u3e+\u3c/sup\u3ee\u3csup\u3e-\u3c/sup\u3e → τ\u3csup\u3e*+\u3c/sup\u3eτ\u3csup\u3e*-\u3c/sup\u3e → τ\u3csup\u3e+\u3c/sup\u3eτ\u3csup\u3e-\u3c/sup\u3eγ γ and e\u3csup\u3e+\u3c/sup\u3ee\u3csup\u3e-\u3c/sup\u3e → ττ\u3csup\u3e*\u3c/sup\u3e → τ\u3csup\u3e+\u3c/sup\u3eτ\u3csup\u3e-\u3c/sup\u3eγ, using the L3 detector at LEP. Using the τ\u3csup\u3e*\u3c/sup\u3e pair production channel, we can exclude a τ\u3csup\u3e*\u3c/sup\u3e up to a mass of 45.5 geV at 95% confidence level. We have also determined upper limits on the ττ\u3csup\u3e*\u3c/sup\u3eZ\u3csup\u3e0\u3c/sup\u3e and ττ\u3csup\u3e*\u3c/sup\u3eγ couplings as a function of m\u3csub\u3eτ*\u3c/sub\u3e up to 89.3 GeV.\u3c/p\u3