arXiv 1501.063572015-01hep-ph

天然SUSY，带有类似比诺或葡萄酒的LSP

Natural SUSY with a bino- or wino-like LSP

Howard Baer, Vernon Barger, Peisi Huang, Dan Mickelson, Maren Padeffke-Kirkland, Xerxes Tata

备注：: 32 pages with 21 .pdf and .png figures; version 2 updated to coincide with published version
发表信息：: Phys. Rev. D 91, 075005 (2015)
DOI：: 10.1103/PhysRevD.91.075005

摘要：

在自然的超对称模型中，希格斯介子总是轻的，因为μ^2不可能比M_Z^2大很多，而方介子和胶子可能非常重。除非在LHC 13中发现了胶子，否则通常假设的统一的胶子质量参数将意味着相应的重的winos和binos，导致类似于higgsino的LSP和小的higgsino间质量分裂。希格西诺衰变中释放的可见能量很小，这使得它们的电子对很难在大型强子对撞机上检测到。放松的高真质量普适性允许相对较轻的winos和binos，而不会违反LHC的胶子质量边界，也不会影响自然性。当双质量M_1<~ μ时，则得到具有较大质量隙w_1-z_1和z_2-z_1的混合双希格辛LSP。热中性伴子的丰度可以与测量的暗物质密度相匹配，这与具有类希格斯诺LSP的模型相反，其中WIMP（弱相互作用大质量粒子）的产生不足10-15倍。如果M_2<~ μ，则得到一个具有大的z_2-z_1质量隙和小的w_1-z_1质量隙的混合Wino-Higgsino LSP，但热生WIMP的丰度仍然不足。在自旋相关的中性子-核子截面上，冰立方的上限可能已经排除了部分轻的维诺参数空间。我们讨论了暗物质检测在其他直接和间接的检测实验和警告，从这些边界必须小心解释。最后，我们表明，LHC 13实验应该能够探测这些非普适质量的情况下，通过各种渠道，包括多轻子+ etmiss事件，WZ+etmiss事件，Wh+etmiss事件和W^ \pm W^ \pm +etmiss事件从电弱电荷和中性伴子生产。

英文摘要：

In natural SUSY models higgsinos are always light because μ^2 cannot be much larger than M_Z^2, while squarks and gluinos may be very heavy. Unless gluinos are discovered at LHC13, the commonly assumed unification of gaugino mass parameters will imply correspondingly heavy winos and binos, resulting in a higgsino-like LSP and small inter-higgsino mass splittings. The small visible energy release in higgsino decays makes their pair production difficult to detect at the LHC. Relaxing gaugino mass universality allows for relatively light winos and binos without violating LHC gluino mass bounds and without affecting naturalness. In the case where the bino mass M_1<~ μ, then one obtains a mixed bino-higgsino LSP with instead sizable w_1-z_1 and z_2-z_1 mass gaps. The thermal neutralino abundance can match the measured dark matter density in contrast to models with a higgsino-like LSP where WIMPs (weakly interacting massive particles) are underproduced by factors of 10-15. If instead M_2<~ μ, then one obtains a mixed wino-higgsino LSP with large z_2-z_1 but small w_1-z_1 mass gaps with still an under-abundance of thermally-produced WIMPs. Portions of the light wino parameter space may already be excluded by the IceCube upper bound on the spin-dependent neutralino-nucleon cross section. We discuss dark matter detection in other direct and indirect detection experiments and caution that the bounds from these must be interpreted with care. Finally, we show that LHC13 experiments should be able to probe these non-universal mass scenarios via a variety of channels including multi-lepton + etmiss events, WZ+etmiss events, Wh+etmiss events and W^\pm W^\pm +etmiss events from electroweak chargino and neutralino production.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

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