Dirac Gauginos, Gauge Mediation and Unification

TL;DR

This paper explores models with Dirac gauginos that achieve gauge coupling unification, using additional fields as natural messengers of supersymmetry breaking, and provides explicit spectra consistent with string theory predictions.

Contribution

It introduces a framework for constructing Dirac gaugino models with unification, detailing the messenger sector constraints and RG equations distinct from MSSM.

Findings

Models with Dirac gauginos can unify gauge couplings at string-inspired scales.

Additional fields serve as natural messengers of supersymmetry breaking.

Explicit spectra demonstrate unification consistent with heterotic string predictions.

Abstract

We investigate the building of models with Dirac gauginos and perturbative gauge coupling unification. Here, in contrast to the MSSM, additional fields are required for unification, and these can naturally play the role of the messengers of supersymmetry breaking. We present a framework within which such models can be constructed, including the constraints that the messenger sector must satisfy; and the renormalisation group equations for the soft parameters, which differ from those of the MSSM. For illustration, we provide the spectrum at the electroweak scale for explicit models whose gauge couplings unify at the scale predicted by heterotic strings.