| DATE: |
2007-09-04 11:00 - 12:00 |
| PLACE: |
Kenkyu Honkan Rm. 220 |
| TITLE: |
Possible solution to the $^7$Li problem by the long lived stau |
| CONTACT: |
tsuda |
| SPEAKER: |
Joe Sato (Saitama University) |
| LANGUAGE: |
Japanese |
| ABSTRACT: |
The modification of the Standard Big-Bang Nucleosynthesis is considered in the Minimal Supersymmetric Standard Model to resolve the excessive theoretical prediction of the abundance of the primordial lithium 7. We focus on the staus as a next-lightest superparticle which is long lived due to the 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 destruct the $\mathrm{^{7}Li}$ and $\mathrm{^{7}Be}$ effectively. We show that the modification can lead the consistent prediction with the observed abundance of $\mathrm{^{7}Li}$.
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