Analysis of Anomalous Interactions With Heavy Leptons at $ep$, $e^+e^-$   and $pp$ Colliders
  We consider possible production of heavy leptons via anomalous interactions at future $ep$ colliders (THERA and LHeC), $e^+e^-$ colliders (ILC and CLIC) and $pp$ collider CERN LHC. The production, backgrounds and signatures of heavy leptons are analyzed. We obtain the upper mass limits of 800 GeV at LHeC, 450 GeV at ILC and 650 GeV at LHC for optimal choices of relevant parameters. 
A. T. Tasci and A. T. Alan