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arXiv 0704.3518hep-phastro-ph
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超对称大UTs、超对称跷跷板与中性子暗物质

SUSY-GUTs, SUSY-Seesaw and the Neutralino Dark Matter

L. Calibbi, Y. Mambrini, S. K. Vempati

摘要:

我们将考虑一个右手中微子的SUSY-SU(5),它具有一个类似汤川耦合的大顶部。假设在高尺度下的普遍软质量,我们计算的低能谱,随后的中性伴子LSP遗迹密度也考虑到SU(5)以及跷跷板运行的规范耦合统一尺度以上的影响。我们发现$\tanβ\ler ~35$在参数空间中不存在可行区域。$\tildeτ$共湮灭过程开始变得对$\tanβ\ger 35-40$有效。然而,这一过程受到Stau比中性伴子轻的有限范围的限制。事实上,对于给定的$\tanβ$,我们发现在这个区域中最轻的中性伴子质量($M_{χ_1^0}$)存在一个上界。A极漏斗区出现在非常大的$\tanβ\simeq 45-50$处,而焦点区直到大的($m_0,M_{1/2}$),即几TeV才出现。高尺度下的大$A_0$项可以导致与WMAP约束一致的扩展区域,并消除了Stau共湮灭区域的上限。

英文摘要:

We will consider a SUSY-SU(5) with one right-handed neutrino with a large top like Yukawa coupling. Assuming universal soft masses at high scale we compute the low-energy spectrum and subsequently the neutralino LSP relic density taking also into consideration SU(5) as well as the see-saw running effects above the gauge coupling unification scale. We found that there exists no viable region in parameter space for $\tanβ\ler ~35$. The $\tildeτ$ coannihilation process starts becoming efficient for $\tanβ\ger 35-40$. However, this process is significantly constrained by the limited range in which the stau is lighter than the neutralino. In fact, for a given $\tanβ$ we find that there exists an upper bound on the lightest neutralino mass ($M_{χ_1^0}$) in this region. The A-pole funnel region appears at very large $\tanβ\simeq 45-50$, while the focus-point region does not make an appearance till large ($m_0,M_{1/2}$), namely a few TeV. Large $A_0$ terms at high scale can lead to extended regions consistent with WMAP constraints and remove the upper bounds in the stau coannihilation regions.

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