与解耦的第一/二代标量粒子危险共舞：大型强子对撞机上的超对称前景
Living dangerously with decoupled first/second generation scalars: SUSY prospects at the LHC
AI总结：
本文研究弦景观驱动的大标量软质量下第一/二代标量解耦的超对称情景，在NUHM3模型中刻画了满足希格斯质量与自然性要求的参数空间，并指出CCB极小值排除了小质量参数区域，从而解释LHC未发现超对称的原因。
摘要：
弦景观统计倾向于大的标量软质量，这导致了一种混合的准简并/解耦方案来解决超对称味与CP问题，其中第一/二代物质标量粒子处于20-40 TeV范围。随着第一/二代标量粒子质量的增加，超对称模型实际上变得更加自然，因为双圈重整化群效应抑制了相应的第三代软质量。这也可能导致大量参数空间区域因标量势中存在电荷和/或色破缺（CCB）极小值而被禁止。我们勾勒出引力传递的三额外参数非普适希格斯模型NUHM3所允许的超对称参数空间。具有m_h~125 GeV、Δ_{EW}<~30以及解耦的第一/二代标量粒子的自然区域的特征是相当重的胶微子和电弱微子，但μ相当小，且顶夸克超伴子并未远超大强子对撞机Run 2的限制。这一情景也解释了为什么超对称至今未在大型强子对撞机上被发现：具有小标量粒子质量和微子质量的参数空间全部被CCB极小值的存在所排除。
英文摘要：
The string landscape statistical draw to large scalar soft masses leads to a mixed quasi-degeneracy/decoupling solution to the SUSY flavor and CP problems where first/second generation matter scalars lie in the 20-40 TeV range. With increasing first/second generation scalars, SUSY models actually become more natural due to two-loop RG effects which suppress the corresponding third generation soft masses. This can also lead to substantial parameter space regions which are forbidden by the presence of charge and/or color breaking (CCB) minima of the scalar potential. We outline the allowed SUSY parameter space for the gravity-mediated three extra-parameter-non-universal Higgs model NUHM3. The natural regions with m_h~ 125 GeV, Δ_{EW}<~ 30 and decoupled first/second generation scalar are characterized by rather heavy gluinos and EW gauginos, but with rather small μand top-squarks not far beyond LHC Run 2 limits. This scenario also explains why SUSY has so far eluded discovery at LHC in that the parameter space with small scalar and gaugino masses is all excluded by the presence of CCB minima.
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