Gaugino Mediated Supersymmetry Breaking

TL;DR

This paper proposes a realistic, predictive model for supersymmetry breaking in theories with extra dimensions, where gauge and Higgs fields propagate in the bulk and matter fields are localized on branes, addressing naturalness and flavor issues.

Contribution

It introduces a new class of gaugino-mediated supersymmetry breaking models with extra dimensions, naturally suppressing flavor-changing processes and solving CP and  problems.

Findings

The model predicts a distinctive superpartner spectrum.

Flavor-changing neutral currents are naturally suppressed.

The  term is generated via the Giudice-Masiero mechanism.

Abstract

We consider supersymmetric theories where the standard-model quark and lepton fields are localized on a "3-brane" in extra dimensions, while the gauge and Higgs fields propagate in the bulk. If supersymmetry is broken on another 3-brane, supersymmetry breaking is communicated to gauge and Higgs fields by direct higher-dimension interactions, and to quark and lepton fields via standard-model loops. We show that this gives rise to a realistic and predictive model for supersymmetry breaking. The size of the extra dimensions is required to be of order 10-100 times larger than fundamental scale (e.g. the string scale). The spectrum is similar to (but distinguishable from) the predictions of "no-scale" models. Flavor-changing neutral currents are naturally suppressed. The \mu term can be generated by the Giudice-Masiero mechanism. The supersymmetric CP problem is naturally solved if CP violation occurs only on the observable sector 3-brane. These are the simplest models in the literature that solve all supersymmetric naturalness problems.