Neutrino Masses in an Extended Gauge Model with E_6 Particle Content

Abstract

Naturally light singlet neutrinos which mix with the usual doublet neutrinos are possible if the supersymmetric standard gauge model is extended to include a specific additional U(1) factor derivable from E_6 decomposition. The low-energy particle content of the model is limited to the fundamental 27 representations of E_6.

Comments: 10 pages, latex, no figure