Relaxed fine-tuning in models with nonuniversal gaugino masses
Relaxed fine-tuning in models with nonuniversal gaugino masses
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DOI：
10.1103/physrevd.76.015002
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发表时间：
2007-03
影响因子：
5
通讯作者：
H. Abe;Tatsuo C. Kobayashi;Y. Omura
中科院分区：
文献类型：
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作者：
H. Abe;Tatsuo C. Kobayashi;Y. Omura
采用自底向上的方法，研究了最小超对称标准模型中弱对称破缺参数与μ项之间的微调问题.结果表明，在大统一理论（GUT）尺度下，非普适的高吉诺质量之间的一定比例是必要的，以减少微调。此外，当所有的高更质量在起源上被看作是独立的质量时，在GUT标度下，除了非普适性外，还需要一个小的高更质量M3 ≤ 12 0 GeV和一个与顶夸克相关的非零A项AtO（M3）.另一方面，当我们考虑一些UV理论时，它将软超对称性破缺参数的比率固定为除了总幅度之外的某些值，允许较重的光谱。在弱标度下，Gluino和W-ino质量几乎是简并的，而b-ino质量的更宽区域是有利的。
We study, in a bottom-up approach, the fine-tuning problem between soft supersymmetry (SUSY) breaking parameters and the μ term for the successful electroweak symmetry breaking in the minimal supersymmetric standard model. It is shown that certain ratios among nonuniversal gaugino masses at the grand unified theory (GUT) scale are necessary to reduce fine-tuning. In addition, when all the gaugino masses are regarded as independent ones in their origins, a small gluino mass M 3 ≤ 120 GeV and a nonvanishing A term A t ∼ O(M 3 ) associated with top squarks are also required at the GUT scale as well as the nonuniversality. On the other hand, when we consider some UV theory, which fixes ratios of soft SUSY breaking parameters as certain values aside from the overall magnitude, heavier spectra are allowed. It is favored that the gluino and W-ino masses are almost degenerate at the weak scale, while a wider region of b-ino mass is favorable.