Heavy Triplet Leptons and New Gauge Boson

Abstract

A heavy triplet of leptons (Σ +,Σ 0,Σ −)R per family is proposed as the possible anchor of a small seesaw neutrino mass. A new U(1) gauge symmetry is then also possible, and the associated gauge boson X may be discovered at or below the TeV scale. We discuss the phenomenology of this proposal, with and without possible constraints from the NuTeV and atomic parity violation experiments, which appear to To obtain nonzero neutrino masses so as to explain the observed atmospheric [1] and solar [2] neutrino oscillations, the minimal standard model of particle interactions is often extended to include three neutral fermion singlets, usually referred to as right-handed singlet neutrinos. If they have large Majorana masses, then the famous seesaw mechanism [3] allows the observed