Exotic Leptons: Collider and Muon Magnetic Moment Constraints

Abstract

In light of the ongoing effort on reducing the theoretical uncertainties and an upcoming experiment concerning muon magnetic moment, we perform a detailed study of an 3-4-1 electroweak gauge extension of the standard model that contains exotic charged leptons in its spectrum. We discuss flavor changing neutral current, collider and electroweak bounds on the model and derive $1\sigma$ limits using current and projected limits on the muon magnetic moment. In summary, we exclude the masses of new gauge bosons that couple to muons and heavy charged leptons up to $700$~GeV. Moreover, we find a projected lower bound on the scale of symmetry breaking to be $2$~TeV.