Big-bang nucleosynthesis and the relic abundance of dark matter in a stau-neutralino coannihilation scenario

TL;DR

This paper explores how a specific supersymmetric model can simultaneously explain dark matter abundance and resolve lithium-7 discrepancies in Big-Bang Nucleosynthesis by tuning neutralino and stau masses.

Contribution

It demonstrates that a stau-neutralino coannihilation scenario within the MSSM can account for dark matter and lithium-7 observations with specific mass parameters.

Findings

Neutralino mass of 300 GeV fits dark matter abundance.

Mass difference between stau and neutralino is 100-120 MeV.

Stau lifetime predicted to be 100-1000 seconds.

Abstract

A scenario of the Big-Bang Nucleosynthesis is analyzed within the Minimal Supersymmetric Standard Model which is consistent with a stau-neutralino coannihilation scenario to explain the relic abundance of dark matter. We find that we can account for the possible descrepancy of the abundance of $\mathrm{^{7}Li}$ between the observation and the prediction of the Big-Bang Nucleosynthesis by taking the mass of the neutralino as $300 \mathrm{GeV}$ and the mass difference between the stau and the neutralino as $(100 -- 120) MeV$. We can therefore simultaneously explain the abundance of the dark matter and that of $\mathrm{^{7}Li}$ by these values of parameters. The lifetime of staus in this scenario is predicted to be $O(100 -- 1000) sec$.