Production of new charged leptons decaying into massive neutrinos

A recent paper from Perl pointed out that existing limits from e+e- annihilation data for a fourth-generation charged lepton L+ were not valid if the mass splitting between the lepton and its associated neutral lepton were small. The purpose of this paper is twofold: to urge experimentalists at hadron colliders to examine limits for charged leptons without assuming M(L0) = 0, and to provide the necessary formulas for the widths and matrix elements. The formulas presented here assume couplings with arbitrary vector and axial-vector pieces and are thus applicable to the production and decay of other fermions such as right-handed leptons and supersymmetric fermions. We present some sample cross sections for W+→L+L0 applicable to the CERN Spp-barS collider