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arXiv 1107.4770hep-ph
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最小超引力下电弱物理的自然性

Naturalness of electroweak physics within minimal supergravity

S. Cassel

摘要:

低能超对称性的动机是它被用作解决电弱尺度的层次问题。在用自然性参数激发了这个模型之后,有必要检查实验允许的参数空间是否允许实现具有低微调的模型。本论文的研究范围是在最小超引力模型中研究电弱物理的自然性。应用最新的实验约束条件,并对参数空间的扫描进行定量评估。电弱标度的微调进行了评估,在2圈的顺序,和中性伴子暗物质热遗迹能量密度的微调也被确定。参数空间的自然区域被确定和相关的现象学相关的检测讨论。自然度的限制也被发现的参数空间和频谱。当忽略暗物质约束时,发现的最小微调是9分之1,当满足暗物质约束时,发现的最小微调是15分之1。对于这两种情况下,最小的微调被发现为希格斯粒子质量为115 GeV,无论希格斯粒子质量约束是否适用。最自然的光谱包括轻的超伴费米子和重的超伴标量。最小的超重力目前仍然是可行的自然和自然实现可能会发现在未来几年内。

英文摘要:

Low energy supersymmetry is motivated by its use as a solution to the hierarchy problem of the electroweak scale. Having motivated this model with naturalness arguments, it is then necessary to check whether the experimentally allowed parameter space permits realisations of the model with low fine tuning. The scope of this thesis is a study of naturalness of the electroweak physics in the minimal supergravity model. The latest experimental constraints are applied, and the fine tuning is quantitatively evaluated for a scan across the parameter space. The fine tuning of the electroweak scale is evaluated at 2-loop order, and the fine tuning of the neutralino dark matter thermal relic energy density is also determined. The natural regions of the parameter space are identified and the associated phenomenology relevant for detection discussed. Naturalness limits are also found for the parameter space and spectrum. The minimum fine tuning found is 1 part in 9 when dark matter constraints are neglected, and 1 part in 15 when dark matter constraints are satisfied. For both cases, the minimum fine tuning is found for a Higgs mass of 115 GeV irrespective of whether the Higgs mass constraint is applied or not. The most natural spectrum includes light superpartner fermions, and heavy superpartner scalars. Minimal supergravity currently remains viable with respect to naturalness and a natural realisation may be discovered within the next couple of years.

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