We studied allowed region on the intergenerational mixing parameters of sleptons from a viewpoint of big-bang nucleosynthesis in a slepton-neutralino coannihilation scenario. In this scenario, $^7$Li and $^6$Li problems can be solved by considering exotic reactions caused by bound-state effects with a long-lived slepton. Light element abundances are calculated as functions of the relic density and lifetime of the slepton which considerably depend on the intergenerational mixing parameters. Compared with observational light element abundances, we obtain allowed regions on the intergenerational mixing. Ratio of selectron component to stau component, $c_e$, is allowed in $2\times 10^{-11} \lesssim c_e \lesssim 2\times 10^{-9}$ with solving both the $^7$Li and $^6$Li problems. Similarly, the ratio for smuon, $c_μ$, is allowed in $%2\times 10^{-7} \lesssim c_μ \lesssim 5\times 10^{-5}$ for mass difference between slepton and neutralino, which is smaller than muon mass, and $ %10^{-11}\lesssim c_μ \lesssim 2\times 10^{-10}$ for the mass difference in range between muon mass and 125 MeV. We also discuss collider signatures of the slepton decays. We find characteristic double peaks in momentum distribution of event number of the slepton decays with allowed mixing parameters. Discoveries of the double peaks at future collider experiments should confirm our scenario.
Charged Slepton Flavor post the 8 TeV LHC: A Simplified Model Analysis of Low-Energy Constraints and LHC SUSY Searches
由于LHC搜索的零结果与Higgs质量一起严重限制了标准模型的最小超对称扩展,我们采用一种与模型无关的方法来研究带电slepton味.我们研究了一些简化的模型,与不同的子集slepton,电弱gauginos,和希格斯诺斯,并推导出允许slepton风味的依赖性在该地区探测目前的LHC搜索,并在该地区相关的14 TeV LHC。然后,我们研究的影响,允许的风味依赖轻子加上失踪的能量搜索。在某些情况下,风味依赖显著地修改了搜索的范围。这些效应在下一次LHC运行时可能会更大,因为对于在14 TeV探测的更高质量,更大的味道混合和相对质量分裂与低能量约束是相容的。保留完整的轻子味信息可以增加搜索的灵敏度。
Direct Chargino-Neutralino Production at the LHC: Interpreting the Exclusion Limits in the Complex MSSM
我们重新评估的排斥限制的参数描述的超对称(SUSY)电弱部门的MSSM从寻找直接chargino中性伴子生产在大型强子对撞机。我们从简化模型中获得的已发表的极限开始,其中对于重slepton的情况,相关的分支比BR(neu 2-> neu 1 Z)被设置为1。我们展示了如何衰减模式neu 2-> neu 1 h,这不能被忽视,在任何现实的模型,一旦运动学允许,大大减少了排除的参数区域。我们分析了排斥区对高更诺软超对称性破缺质量参数M_1的相位、对轻标量τ的质量、对tb以及对夸克和斯莱普顿质量尺度的依赖性。在所有设想方案中,都可以观察到被排除的参数范围大幅缩小。使用复杂MSSM的完整NLO计算来评估电荷伴子和中性伴子的分支比。研究了非线性光学计算对不相容边界影响的大小。我们还评估了收集100/fb后,在运行在13 TeV的大型强子对撞机的实验分析的潜在影响。
我们根据最近在大型强子对撞机上对$μ\to e + γ$、$θ_{13}$和轻希格斯质量的实验结果,报告了超对称跷跷板模型的现状。假设中微子Dirac Yukawa耦合具有SO(10)类关系,并考虑了两种混合情况,一种是大的PMNS类混合,另一种是小的CKM类混合。结果表明,对于大混合的情况下,只有一个小范围的参数空间与中等$\tan β$仍然是允许的。该剩余区域可以通过BR($μ\to e + γ$)电流限值的数量级改善来排除。我们还探讨了在高尺度下的非普适Higgs质量边界条件模型。结果表明,重整化群诱导的味违反Slepton质量项对Higgs边界条件高度敏感。根据参数的选择,它们可以导致强烈的增强或取消违反风味的条款。与mSUGRA相比,这种取消可能会放松轻子味破坏所施加的严格限制。然而,对于一个大的区域的参数空间的预测率在于达到未来的实验,一旦轻希格斯质量约束。我们还更新了正在进行的和未来的实验搜索的潜力轻子味违反约束超对称参数空间。
We consider a minimal natural supersymmetric model based on an extra dimension with supersymmetry breaking provided by the Scherk-Schwarz mechanism. The lightest supersymmetric particle is a neutral, quasi-Dirac Higgsino and, unlike in previous studies, we assume that all Standard Model fields are propagating in the bulk. The resulting setup is minimal, as neither extra matter, effective operators, nor extra $U(1)$ groups are needed in order to be viable. The model has three free parameters which are fixed by the Higgsino mass -- set to the range 1.1-1.2 TeV so it can play the role of Dark Mat…