Dynamical Supersymmetry Breaking and Low Energy Gauge Mediation

TL;DR

This paper discusses recent advances in dynamical supersymmetry breaking, emphasizing models that achieve low energy breaking through symmetries, which can improve gauge mediation spectra and address the mu problem.

Contribution

It introduces models of dynamical supersymmetry breaking that naturally occur at low energies via symmetries, enhancing gauge mediation and solving the mu problem.

Findings

Low energy supersymmetry breaking can be achieved without fine-tuning.

Models with or without R symmetries modify gauge-mediated spectra.

Natural mechanisms exist to solve the mu problem within these models.

Abstract

Dynamical breaking of supersymmetry was long thought to be an exceptional phenomenon, but recent developments have altered this view. A question of great interest in the current framework is the value of the underlying scale of supersymmetry breaking. The "little hierarchy" problem suggests that supersymmetry should be broken at low energies. Within one class of models, low energy breaking be achieved as a consequence of symmetries, without requiring odd coincidences. The low energy theories are distinguished by the presence or absence of $R$ symmetries; in either case, and especially the latter one often finds modifications of the minimal gauge-mediated spectrum which can further ameliorate problems of fine tuning. Various natural mechanisms exist to solve the $\mu$ problem in this framework.