Dirac Gauginos in Low Scale Supersymmetry Breaking

TL;DR

This paper explores the phenomenology of light gravitinos in models with Dirac gaugino masses, focusing on scalar octet decays and proposing a simplified scenario relevant for low-scale supersymmetry breaking.

Contribution

It investigates the couplings and phenomenology of gravitinos with Dirac gauginos, introducing a simplified model with light gluinos, sgluons, and gravitinos for better understanding.

Findings

New decay channels for scalar octets are identified.

A simplified effective scenario with light gluinos, sgluons, and gravitinos is proposed.

Implications for Fake Split Supersymmetry are discussed.

Abstract

It has been claimed that Dirac gaugino masses are necessary for realistic models of low-scale supersymmetry breaking, and yet very little attention has been paid to the phenomenology of a light gravitino when gauginos have Dirac masses. We begin to address this deficit by investigating the couplings and phenomenology of the gravitino in the effective Lagrangian approach. We pay particular attention to the phenomenology of the scalar octets, where new decay channels open up. This leads us to propose a new simplified effective scenario including only light gluinos, sgluons and gravitinos, allowing the squarks to be heavy -- with the possible exception of the third generation. Finally, we comment on the application of our results to Fake Split Supersymmetry.