Naturalness and Focus Points with Non-Universal Gaugino Masses

TL;DR

This paper explores models of supersymmetry breaking with non-universal gaugino masses that naturally reduce fine-tuning in the MSSM, satisfying collider constraints with minimal tuning.

Contribution

It demonstrates that specific gravity-mediated SUSY breaking models can naturally generate gaugino mass relations that lower fine-tuning in the MSSM.

Findings

Regions with less than 20% fine-tuning identified

Models satisfy all collider constraints

Phenomenological features discussed

Abstract

Relations between the gaugino masses have been shown to alleviate the degree of fine-tuning in the MSSM. In this paper we consider specific models of supersymmetry breaking with gravity mediation and demonstrate that within both GUT and string constructions it is possible to generate these relations in a natural way. We have numerically studied the degree of fine-tuning in these models, including one-loop corrections, and have found regions of parameter space that can satisfy all known collider constraints with fine-tunings less than 20%. We discuss some of the phenomenological features of these models within the regions of reduced fine-tuning.