Vectorlike Leptons as the Tip of the Dark Matter Iceberg

Abstract

A vectorlike lepton could make up a tiny fraction of the dark matter. Its large Z-boson mediated direct detection cross section can compensate for the small relic abundance, giving rise to an interesting signal at future experiments---perhaps even the first one detected. We discuss how such a scenario might arise in the context of a simple non-thermal cosmology and investigate bounds from direct detection experiments and whether this scenario might be probed at the LHC. Searches for disappearing tracks appear promising.