New mechanisms of dynamical supersymmetry breaking and direct gauge mediation

Abstract

We construct supersymmetric gauge theories with new mechanisms of dynamical supersymmetry breaking. The models have flat directions at the classical level, and different mechanisms lift these flat directions in different regions of the classical moduli space. In one branch of the moduli space, supersymmetry is broken by confinement in a novel manner. The models contain only dimensionless couplings and have large groups of unbroken global symmetries, making them potentially interesting for model building. As an illustrative application, we couple the standard model gauge group to a model with an SU(5) global symmetry, resulting in a model with composite messengers and a nonminimal spectrum of superpartner masses.