将小层次问题隐藏在NMSSM中
Hiding the little hierarchy problem in the NMSSM
摘要：
在本文中，我们考虑了一组软超对称破缺项内的NMSSM导致一个小的层次之间的超对称破缺尺度和电弱尺度。具体来说，只有高吉诺质量和希格斯扇区中的软项在大统一理论尺度下是不为零的。这种模式可以在高吉诺介导的模型和高维orbifold GUT中找到。我们研究了这种情况下的现象，并发现不同的低能谱取决于汤川耦合$λ$的NMSSM单态。特别地，对于低的$λ$值，单线态是最轻的标量，单线态是LSP，而对于大的$λ$值，两者都是重的，引力子可以是LSP。单重赝标在整个参数空间中是非常轻的。
英文摘要：
In this paper we consider a set of soft supersymmetry breaking terms within the NMSSM which leads to a small hierarchy between the supersymmetry breaking scale and the electroweak scale. Specifically only the gaugino masses and the soft term in the Higgs sector are non-vanishing at the GUT scale. This pattern can be found in gaugino mediated models and in higher-dimensional orbifold GUTs. We study the phenomenology of this scenario and find different low energy spectra depending on the Yukawa coupling $λ$ of the NMSSM singlet. In particular, for low values of $λ$ the singlet is the lightest scalar and the singlino is the LSP while for large values of $λ$ both are heavy and the gravitino can be the LSP. The singlet pseudoscalar is very light in the entire parameter space.
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