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Status of weak scale supersymmetry after LHC Run 2 and ton-scale noble liquid WIMP searches
The European Physical Journal Special Topics ( IF 2.8 ) Pub Date : 2020-12-14 , DOI: 10.1140/epjst/e2020-000020-x
Howard Baer , Vernon Barger , Dibyashree Sengupta , Shadman Salam , Kuver Sinha

After completion of LHC Run 2, the ATLAS and CMS experiments had collected of order 139 fb−1 of data at √s = 13 TeV. While discovering a very Standard Model-like Higgs boson of mass mh ≃ 125 GeV, no solid signal for physics beyond the Standard Model has emerged so far at LHC. In addition, no WIMP signals have emerged so far at ton-scale noble liquid WIMP search experiments. For the case of weak scale supersymmetry (SUSY), which is touted as a simple and elegant solution to the gauge hierarchy problem and likely low energy limit of compactified string theory, LHC has found rather generally that gluinos are beyond about 2.2 TeV whilst top squark must lie beyond 1.1 TeV. These limits contradict older simplistic notions of naturalness that emerged in the 1980s–1990s, leading to the rather pessimistic view that SUSY is now excluded except for perhaps some remaining narrow corners of parameter space. Yet, this picture ignores several important developments in SUSY/string theory that emerged in the 21st century: 1. the emergence of the string theory landscape and its solution to the cosmological constant problem, 2. a more nuanced view of naturalness including the notion of “stringy naturalness”, 3. the emergence of anomaly-free discrete R-symmetries and their connection to R-parity, Peccei-Quinn symmetry, the SUSY μ problem and proton decay and 4. the importance of including a solution to the strong CP problem. Rather general considerations from the string theory landscape favor large values of soft terms, subject to the vacuum selection criteria that electroweak symmetry is properly broken (no charge and/or color breaking (CCB) minima) and the resulting magnitude of the weak scale is not too far from our measured value. Then stringy naturalness predicts a Higgs mass mh ~ 125 GeV whilst sparticle masses are typically lifted beyond present LHC bounds. In light of these refinements in theory perspective confronted by LHC and dark matter search results, we review the most likely LHC, ILC and dark matter signatures that are expected to arise from weak scale SUSY as we understand it today.



中文翻译:

LHC运行2和吨级稀有液体WIMP搜索后的弱尺度超对称状态

LHC运行2的完成后,ATLAS和CMS实验已经收集顺序139 fb的-1在√数据的小号= 13 TeV的。在发现质量为m h的非常类似于标准模型的希格斯玻色子时Ge 125 GeV,到目前为止,LHC尚未出现超出标准模型的物理固体信号。此外,到目前为止,在吨级稀有液体WIMP搜索实验中还没有出现WIMP信号。对于弱尺度超对称性(SUSY)(被认为是解决轨距等级问题的一种简单而优雅的解决方案,以及紧凑弦理论可能的低能量限制)的案例,LHC普遍发现,胶粘剂的含量超过2.2 TeV,而上夸克必须超出1.1 TeV。这些限制与1980年代至1990年代出现的较旧的自然简单性概念相矛盾,导致相当悲观的观点认为,除了参数空间的某些狭窄角落之外,现在已将SUSY排除在外。但是,此图忽略了21世纪出现的SUSY /弦理论中的几个重要发展:1。ř -symmetries和它们连接ř -parity,Peccei-昆对称性,超对称μ问题和质子衰变和4.将包括一个解决强CP问题的重要性。相反,基于弦论的一般考虑倾向于使用较大的软项,但要遵循真空选择标准,即适当地破坏了电弱对称性(无电荷和/或颜色破坏(CCB)最小值),并且所产生的弱尺度不大。与我们的测量值相差太远。然后严谨的自然性预示了希格斯质量m h〜125 GeV,而粒子质量通常被提升到当前LHC范围之外。鉴于LHC和暗物质搜索结果面临的理论上的细化,我们回顾了当今我们理解的弱规模SUSY有望产生的最可能的LHC,ILC和暗物质特征。

更新日期:2020-12-12
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