Production of Single Heavy Charged Leptons at a Linear Collider

Understand

A sequential fourth generation of quarks and leptons is allowed by precision electroweak constraints if the mass splitting between the heavy quarks is between 50 and 80 GeV.

• Although heavy quarks can be easily detected at the LHC, it is very difficult to detect a sequential heavy charged lepton, L, due to large backgrounds.
• Should the L mass be above 250 GeV, it can not be pair-produced at a 500 GeV ILC.
• We calculate the cross section for the one-loop process e+e- -> L tau.