Hiding missing energy in missing energy
Hiding missing energy in missing energy
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DOI：
10.1007/jhep04(2015)088
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发表时间：
2013-12
影响因子：
5.4
通讯作者：
D. Alves;Jia Liu;N. Weiner
中科院分区：
文献类型：
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作者：
D. Alves;Jia Liu;N. Weiner
超对称性理论（SUSY）通常依赖于硬物理对象（喷流、轻子）的组合，这些对象沿着有很大的横向能量缺失，从而将新物理与标准模型硬过程分开。我们考虑一类“双不可见”超对称情形：其中squarks，stops和sbottoms有一个三体衰变成两个（而不是一个）看不见的末态粒子。当LSP携带一个额外的保守量子数时，这自然会发生，在这个量子数下，其他超伴体不带电。在这些拓扑结构中，可用的能量被稀释到不可见的粒子中，减少了观测到的丢失能量和可见能量。这可能会导致现有搜索的敏感性发生相当大的变化，极大地改变了对超级伙伴的定性约束。特别是，对于m LSP 160 GeV，我们发现没有强大的约束，从大型强子对撞机在任何夸克质量的任何一代，而对于较轻的LSP，我们发现显着减少的约束。如果通过合作的全面重新分析得到证实，这种情况允许更自然的超对称模型的可能性。虽然在MSSM中没有实现，但这种现象在混合sneutrinos，Dirac gauginos和NMSSM类模型中自然发生。
Searches for supersymmetry (SUSY) often rely on a combination of hard physics objects (jets, leptons) along with large missing transverse energy to separate New Physics from Standard Model hard processes. We consider a class of “double-invisible” SUSY scenarios: where squarks, stops and sbottoms have a three-body decay into two (rather than one) invisible final-state particles. This occurs naturally when the LSP carries an additional conserved quantum number under which other superpartners are not charged. In these topologies, the available energy is diluted into invisible particles, reducing the observed missing energy and visible energy. This can lead to sizable changes in the sensitivity of existing searches, dramatically changing the qualitative constraints on superpartners. In particular, for m LSP≳ 160 GeV, we find no robust constraints from the LHC at any squark mass for any generation, while for lighter LSPs we find significant reductions in constraints. If confirmed by a full reanalysis from the collaborations, such scenarios allow for the possibility of significantly more natural SUSY models. While not realized in the MSSM, such phenomenology occurs naturally in models with mixed sneutrinos, Dirac gauginos and NMSSM-like models.