2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42033A new nontrivial U(1) gauge extension of the Minimal Supersymmetric Standard Model (MSSM) is proposed which automatically conserves baryon number and lepton number, and solves the mu problem. Naturally small Dirac neutrino masses are also possible in this context.6 pages, talk at TH-2002, Paris (July 2002)High Energy Physics - Phenomenologytext