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arXiv 0903.3974hep-phastro-ph.CO
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约束MSSM中引力子暗物质的再分析

A Re-analysis of Gravitino Dark Matter in the Constrained MSSM

Sean Bailly, Ki-Young Choi, Karsten Jedamzik, Leszek Roszkowski

摘要:

我们在约束MSSM的框架下重新考虑引力子作为暗物质。我们包括几个最近提出的改进:(i)热生产的引力子,(ii)强子谱的计算从NLSP衰变和(iii)BBN计算包括Stau束缚态效应。在大多数情况下,我们发现一个上限的再加热温度$\treh\lsim {\rm a few}\times 10^7\gev$从过量生产的$^6{\rm Li}$从结合态效应。我们还发现$3\times10^4 \sec$的稳态寿命有一个上限,它比通常用来避免束缚态催化效应的简单极限$5\times 10^3 \sec$大了近一个数量级。当我们在${^6}{\rm Li}/{^7}{\rm Li}$上使用更保守的束缚时,$\treh$上的束缚被放宽到$\lsim {\rm a few}\times 10^8\gev$,在这种情况下,在$\sim 100\gev$上出现了一个新的小质量区域和更长的寿命。这样一个低质量的区域可以很容易地在LHC上进行测试。

英文摘要:

We re-consider the gravitino as dark matter in the framework of the Constrained MSSM. We include several recently suggested improvements on: (i) the thermal production of gravitinos, (ii) the calculation of the hadronic spectrum from NLSP decay and (iii) the BBN calculation including stau bound-state effects. In most cases we find an upper bound on the reheating temperature $\treh\lsim {\rm a few}\times 10^7\gev$ from over-production of $^6{\rm Li}$ from bound state effects. We also find an upper limit on the stau lifetime of $3\times10^4 \sec$, which is nearly an order of magnitude larger than the simple limit $5\times 10^3 \sec$ often used to avoid the effect of bound-state catalysis. The bound on $\treh$ is relaxed to $\lsim {\rm a few}\times 10^8\gev$ when we use a more conservative bound on ${^6}{\rm Li}/{^7}{\rm Li}$, in which case a new region at small stau mass at $\sim 100\gev$ and much longer lifetimes opens up. Such a low stau mass region can be easily tested at the LHC.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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