2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/194488Until recently, dynamical supersymmetry breaking seemed an exceptional phenomenon, involving chiral gauge theories with a special structure. Recently it has become clear that requiring only metastable states with broken supersymmetry leads to a far broader class of theories. In this paper, we extend these constructions still further, finding new classes which, unlike earlier theories, do not have unbroken, approximate $R$ symmetries. This allows construction of new models with direct gauge mediation. These theories permit a relatively compact solution to the $μ$ problem.11 pages, latex. Issues of metastability further elaboratedHigh Energy Physics - PhenomenologyHigh Energy Physics - Theorytext