Pair production of heavy exotic fermions ate+e−colliders

Abstract

We study the production and signatures of heavy exotic fermion pairs at ${e}^{+}{e}^{\ensuremath{-}}$ colliders in the framework of the vector singlet model, vector doublet model and fermion-mirror-fermion model. We show that the pair production cross sections of charged particles are competitive with the ones for the single production of exotic fermions due to the exchange of a photon in the s channel and to the vector component of the Z-boson coupling to exotic fermions. We also exhibit some kinematical distributions.