Composite Messenger Baryon as a Cold Dark Matter

TL;DR

This paper proposes that a baryonic bound state of messenger particles in gauge-mediated SUSY models with ultra-light gravitinos can serve as a natural candidate for cold dark matter, addressing a key gap in such models.

Contribution

It introduces a novel dark matter candidate, a composite baryon of messenger particles, within gauge-mediated SUSY models with ultra-light gravitinos.

Findings

The baryonic bound state has a mass of around 100 TeV.

The model naturally explains the stability and abundance of dark matter.

It provides a concrete realization of the scenario.

Abstract

Among various supersymmetric (SUSY) models, gauge-mediated SUSY breaking models with an ultra-light gravitino of mass m_{3/2} \lesssim O(10) eV are very attractive, since they are completely free from notorious gravitino problems. A drawback of such a scenario is the absence of the supersymmetric cold dark matter. In this letter, we propose that a baryonic bound state of strongly interacting messenger particles, with a mass of O(100) TeV, can naturally be the cold dark matter. We also exemplify a model which realizes such a scenario.