Isosinglet vectorlike leptons at $e^+e^-$ colliders

We study weak isosinglet vectorlike leptons that decay through a small mixing with the tau lepton, for which the discovery and exclusion reaches of the Large Hadron Collider and future proposed hadron colliders are limited. We show how an $e^+ e^-$ collider may act as a discovery machine for these $τ^{\prime}$ particles, demonstrate that the $τ^{\prime}$ mass peak can be reconstructed in a variety of distinct signal regions, and explain how the $τ^{\prime}$ branching ratios may be measured.

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