The Gravitino-Stau Scenario after Catalyzed BBN

TL;DR

This paper investigates how Catalyzed Big Bang Nucleosynthesis constrains models with gravitino lightest supersymmetric particles and charged slepton next-to-lightest particles, focusing on gaugino-mediated SUSY breaking.

Contribution

It derives a lower bound on the gaugino mass parameter in models with gravitino LSP and charged slepton NLSP considering Catalyzed BBN effects.

Findings

Lower bound on gaugino mass parameter m_1/2 derived

Parameter space of gaugino mediation compatible with cosmology identified

Constraints significantly restrict supersymmetric model parameters

Abstract

We consider the impact of Catalyzed Big Bang Nucleosynthesis on theories with a gravitino LSP and a charged slepton NLSP. In models where the gravitino to gaugino mass ratio is bounded from below, such as gaugino-mediated SUSY breaking, we derive a lower bound on the gaugino mass parameter m_1/2. As a concrete example, we determine the parameter space of gaugino mediation that is compatible with all cosmological constraints.