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By exploiting the relatively long lifetime of the tau lepton, we proposeseveral novel methods for searching for new physics at an electron-positroncollider. We consider processes that involve final states consisting of a taulepton pair plus two missing particles. The mass and spin of the new physicsparticles can be measured in 3-prong tau decays. The tau polarization, whichreflects the coupling to new physics, can be measured from the $\tau \to \pi\nu$ decay channel using the impact parameter distribution of the charged pion.We also discuss the corresponding backgrounds for these measurements, thenext-to-leading order (NLO) effects, and the implications of finite detectorresolution.

Tau reconstruction methods at an electron-positron collider in the search for new physics