从无标度F-SU收缩的SUSY（5）：LHC顶夸克重建的“盲点”？
Constricted SUSY from No-Scale F-SU(5): A "Blind Spot" for LHC Top Quark Reconstruction?
摘要：
我们描述了一个区域的无标度F-SU（5）超对称模型与TeV尺度的矢量状物质多重态，这是潜在的不透明的大型强子对撞机的观察基于顶夸克重建。F-SU（5）中的胶子-光阻质量分裂在810（650）<~ M（胶子）（M（光阻））<~ 1170（975）GeV的区域内非常接近顶夸克静止质量，胶子-光阻衰变的壳层上分支率为100%。对于未增强的胶子对产生，这可能会使两个软顶夸克处于主导的4-top签名中，大大降低了从组合背景中辨别的可能性。因此，我们建议，谨慎是有道理的，当胶子排斥边界上具有类似的光谱特性（胶子重比光停止，但轻于所有其他squarks）使用multijet超对称搜索策略的模型。替代的搜索方法突出显示，包括那些基于相同的符号双轻子和多重重口味标签，这是更敏感的这个微妙的运动学“盲点”折痕。
英文摘要：
We describe a region of the No-Scale F-SU(5) supersymmetric model with TeV-scale vector-like matter multiplets that is potentially opaque to LHC observations based upon top quark reconstruction. Possessing a 100% on-shell branching fraction for gluino to light stop decays, the gluino-light stop mass splitting in F-SU(5) lies very close to the top quark rest mass in the region 810 (650) <~ M(gluino) (M(light stop)) <~ 1170 (975) GeV. For unboosted gluino pair-production, this could render two soft top quarks in the dominant 4-top signature, greatly reducing the likelihood for discrimination from the combinatoric background. We therefore suggest that caution is warranted when gluino exclusion bounds on models possessing a similar spectral character (gluino heavier than the light stop but lighter than all other squarks) using multijet SUSY search tactics. Alternate search methods are highlighted, including those based upon same sign dileptons and multiple heavy flavor tags, which are more sensitive to this delicate kinematic "blind spot" crease.
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