Possible solution to the $^7$Li problem by the long lived stau

Details Possible solution to the $^7$Li problem by the long lived stau Possible solution to the $^7$Li problem by the long lived stau

2007-04-23

arxiv.org/abs/0704.2914v2

Phys.Rev.D76:125023,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 5 figures

Scientific paper

10.1103/PhysRevD.76.125023

Modification of standard big-bang nucleosynthesis is considered in the minimal supersymmetric standard model to resolve the excessive theoretical prediction of the abundance of primordial lithium 7. We focus on the stau as a next-lightest superparticle, which is long lived due to its small mass difference with the lightest superparticle. It provides a number of additional decay processes of $\mathrm{^{7}Li}$ and $\mathrm{^{7}Be}$. A particularly important process is the internal conversion in the stau-nucleus bound state, which destroys the $\mathrm{^{7}Li}$ and $\mathrm{^{7}Be}$ effectively. We show that the modification can lead to a prediction consistent with the observed abundance of $\mathrm{^{7}Li}$.

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