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

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 ${}^7\mathrm{Li}$ 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 ${}^7\mathrm{Li}$ by these values of parameters. The lifetime of staus in this scenario is predicted to be $O(100--1000)sec$.

9 pages, 2 figures

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