Big-bang nucleosynthesis with a long-lived CHAMP including He4 spallation process

TL;DR

This paper investigates how long-lived staus in supersymmetric models induce helium-4 spallation processes, affecting light element abundances and providing constraints on stau properties, which are more significant than stau-catalyzed fusion.

Contribution

It introduces helium-4 spallation processes caused by long-lived staus and evaluates their impact on primordial nucleosynthesis, highlighting their importance over previous fusion processes.

Findings

Helium-4 spallation processes can dominate light element production.

These processes impose constraints on stau properties.

Spallation effects are significant when the phase space is open.

Abstract

We propose helium-4 spallation processes induced by long-lived stau in supersymmetric standard models, and investigate an impact of the processes on light elements abundances. We show that, as long as the phase space of helium-4 spallation processes is open, they are more important than stau-catalyzed fusion and hence constrain the stau property. This talk is based on works (Jittoh et al., 2011).