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arXiv 0911.1996hep-ph
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超对称破缺的反常与Z'调解的结合

Combining Anomaly and Z' Mediation of Supersymmetry Breaking

Jorge de Blas, Paul Langacker, Gil Paz, Lian-Tao Wang

备注：
Minor changes: references added, typos corrected, journal version
发表信息：
JHEP 1001:037,2010
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摘要：

我们提出了一个方案，其中由额外的U（1）'介导的超对称破缺效应与异常介导的超对称破缺效应相当。我们认为，这样的场景可以自然地实现在一个大类的模型。结合反常和Z'调解，使我们能够解决前者的快子slepton问题，并避免在后者显着的微调。我们重点讨论了一个类似NMSSM的情形，其中U（1）的规范不变性被用来禁止树级μ项，并提出了具体的模型，它承认成功的动力学电弱对称性破缺。高吉诺质量比标量质量轻一些，第三代的平方比前两代轻。在所考虑的特定类别的模型中，胶子是轻的，因为它只接受2圈异常调解的贡献，并且它主要衰变为第三代夸克。Gluino的产生导致了不同的LHC信号和早期发现的前景。此外，还有一个相对较轻的Z '，质量在几TeV的范围内。发现和研究它的性质可以揭示关于潜在模型的重要线索。

英文摘要：

We propose a scenario in which the supersymmetry breaking effect mediated by an additional U(1)' is comparable with that of anomaly mediation. We argue that such a scenario can be naturally realized in a large class of models. Combining anomaly with Z' mediation allows us to solve the tachyonic slepton problem of the former and avoid significant fine tuning in the latter. We focus on an NMSSM-like scenario where U(1)' gauge invariance is used to forbid a tree-level mu term, and present concrete models, which admit successful dynamical electroweak symmetry breaking. Gaugino masses are somewhat lighter than the scalar masses, and the third generation squarks are lighter than the first two. In the specific class of models under consideration, the gluino is light since it only receives a contribution from 2-loop anomaly mediation, and it decays dominantly into third generation quarks. Gluino production leads to distinct LHC signals and prospects of early discovery. In addition, there is a relatively light Z', with mass in the range of several TeV. Discovering and studying its properties can reveal important clues about the underlying model.

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