2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/200294To enforce the conservation of baryon number B and not lepton number L in supersymmetry, a new U(1)_X gauge symmetry is recommended. An example is offered with new particles interacting under U(1)_X which are good candidates for the dark matter of the Universe.6pages, no figureHigh Energy Physics - Phenomenologytext