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arXiv 1506.07151hep-ph
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超对称性：愿望与展望

Supersymmetry: Aspirations and Prospects

Xerxes Tata

备注：
Contributed to the Proceedings of the Richard Arnowitt Memorial Symposium; 29 pages with 5 figures. arXiv admin note: text overlap with arXiv:1404.1386
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摘要：

20世纪80年代初，人们认识到弱尺度超对称性稳定了极为成功的标准模型的希格斯部分，这使得几位作者开始探索低能超对称性是否可以在粒子物理学中发挥作用。其中包括理查德·阿诺维茨、阿里·查姆塞丁和普兰·纳特，他们构建了一个可行的{ \em局部}超对称大统一理论（GUT），为粒子物理学的超引力GUT模型奠定了基础。超重力模型作为标准模型最有前途的扩展之一，继续得到探索。在快速概述了早期研究人员致力于将超对称性纳入粒子物理学主流的一些问题和愿望之后，我们重新审视了早期的论点，这些论点似乎暗示着超伙伴将在LEP 2或Tevatron的实验中被揭示。我们的目的是评估在LHC 8中没有任何超伴子的搜索是否会带来超对称性的危机。为此，我们重新评估微调参数，导致上限（一些）超伙伴群众。我们的结论是，现象上可行的超伙伴光谱，可能会出现在一个高尺度的模型调整不差于百分之几是完全可能的。虽然还没有可行的粒子物理模型，导致这样的光谱尚未出现，我们表明，（超引力为基础的）辐射驱动的自然超对称性（RNS）框架作为一个代理的基础理论的现象学分析与适度微调。我们概述了这个框架的现象学意义，重点是那些大型强子对撞机和电子-正电子对撞机的签名，可能指向规范和希格斯玻色子质量的潜在自然起源。我们的结论是，由Arnowitt，Chamseddine和Nath等人在1982年提出的超重力GUT范式仍然是一个充满活力的可能性。

英文摘要：

The realization in the early 1980s that weak scale supersymmetry stabilizes the Higgs sector of the spectacularly successful Standard Model led several authors to explore whether low energy supersymmetry could play a role in particle physics. Among these were Richard Arnowitt, Ali Chamseddine and Pran Nath who constructed a viable {\em locally} supersymmetric Grand Unified Theory (GUT), laying down the foundation for supergravity GUT models of particle physics. Supergravity models continue to be explored as one of the most promising extensions of the Standard Model. After a quick overview of some of the issues and aspirations of early researchers working to bring supersymmetry into the mainstream of particle physics, we re-examine early arguments that seemed to imply that superpartners would be revealed in experiments at LEP2 or at the Tevatron. Our purpose is to assess whether the absence of any superpartners in searches at LHC8 presents a crisis for supersymmetry. Toward this end, we re-evaluate fine-tuning arguments that lead to upper bounds on (some) superpartner masses. We conclude that phenomenologically viable superpartner spectra that could arise within a high scale model tuned no worse than a few percent are perfectly possible. While no viable underlying model of particle physics that leads to such spectra has yet emerged, we show that the (supergravity-based) Radiatively-driven Natural Supersymmetry (RNS) framework serves as a surrogate for a phenomenological analysis of an underlying theory with modest fine-tuning. We outline the phenomenological implications of this framework, with emphasis on those LHC and electron-positron collider signatures that might point to the underlying natural origin of gauge and Higgs boson masses. We conclude that the supergravity GUT paradigm laid down in 1982 by Arnowitt, Chamseddine and Nath, and others, remains a vibrant possibility.

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