Possible solution to the $^7$Li problem by the long lived stau
| Autor: | Jittoh, Toshifumi, Kohri, Kazunori, Koike, Masafumi, Sato, Joe, Shimomura, Takashi, Yamanaka, Masato |
|---|---|
| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Phys.Rev.D76:125023,2007 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.76.125023 |
| Popis: | 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 $\mathrm{^{7}Li}$. Comment: 6 pages, 5 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|