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arXiv 0705.0431hep-ph
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从对撞机到宇宙学的nMSSM唯象学

Phenomenology of the nMSSM from colliders to cosmology

C. Balazs, M. Carena, A. Freitas, C. E. M. Wagner

摘要:

低能超对称模型提供了一个层次问题的解决方案,也有必要的成分来解决宇宙学中两个最突出的问题:暗物质和重子物质的起源。这个框架最吸引人的特点之一是,相关的物理过程与弱尺度的相互作用有关,因此可能在不久的将来在对撞机实验中进行测试。这对于最小超对称标准模型(MSSM)以及其通过添加一个单重手征超场(所谓的nMSSM)的扩展是真实的。最近的研究表明,在nMSSM中,可以找到一个解决重子生成和暗物质问题的完美方案,它主要依赖于理论中单重态扇区与希格斯扇区的混合。在这项工作中,我们回顾了nMSSM模型的宇宙学约束,并提出了相关的对撞机现象在LHC和ILC。我们表明,ILC将有效地探测中性伴子,电荷伴子和希格斯扇区,允许面对基于对撞机测量的计算宇宙学观测。我们还探讨了直接探测暗物质的前景和在这个模型中的电子电偶极矩的电流边界所施加的限制。

英文摘要:

Low energy supersymmetric models provide a solution to the hierarchy problem and also have the necessary ingredients to solve two of the most outstanding issues in cosmology: the origin of dark matter and baryonic matter. One of the most attractive features of this framework is that the relevant physical processes are related to interactions at the weak scale and therefore may be tested in collider experiments in the near future. This is true for the Minimal Supersymmetric Standard Model (MSSM) as well as for its extension with the addition of one singlet chiral superfield, the so-called nMSSM. It has been recently shown that within the nMSSM an elegant solution to both the problem of baryogenesis and dark matter may be found, that relies mostly on the mixing of the singlet sector with the Higgs sector of the theory. In this work we review the nMSSM model constraints from cosmology and present the associated collider phenomenology at the LHC and the ILC. We show that the ILC will efficiently probe the neutralino, chargino and Higgs sectors, allowing to confront cosmological observations with computations based on collider measurements. We also investigate the prospects for a direct detection of dark matter and the constraints imposed by the current bounds of the electron electric dipole moment in this model.

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