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arXiv 0802.1208hep-ph
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跷跷板扩展的MSSM和无速子睡眠的异常调解

Seesaw Extended MSSM and Anomaly Mediation without Tachyonic Sleptons

R. N. Mohapatra, N. Setzer, S. Spinner

摘要:

超共形异常提供了一个优雅的和经济的方式来理解在超对称模型中的软破缺参数,但是,实施它们会导致几个不希望的功能,包括:快子slepton和电弱对称性破缺问题在MSSM和NMSSM。由于这两个理论也有额外的问题,无质量的中微子,我们重新考虑了AMSB问题的一类模型,扩展了NMSSM解释小中微子质量通过跷跷板机制。在最近的一篇论文中,我们表明,对于一类最小的左,右扩展,存在一个内置的机制,自然解决了快子slepton问题,并提供了新的替代MSSM,也有自动R-宇称守恒。在本文中,我们讨论如何电弱对称性破缺出现在这个模型中,通过一个NMSSM的低能量理论与单重VEV,诱导的结构的左右扩展和正确的幅度。然后,我们研究的唯象问题,并发现:LSP是一个Higgsino-wino混合,新的唯象Chargino衰变到LSP,退化同代slepton和一个温和的squark-slepton简并的潜力。我们还讨论了可能的对撞机签名和暗物质在这个模型中的可行性。

英文摘要:

Superconformal anomalies provide an elegant and economical way to understand the soft breaking parameters in SUSY models; however, implementing them leads to the several undesirable features including: tachyonic sleptons and electroweak symmetry breaking problems in both the MSSM and the NMSSM. Since these two theories also have the additonal problem of massless neutrinos, we have reconsidered the AMSB problems in a class of models that extends the NMSSM to explain small neutrino masses via the seesaw mechanism. In a recent paper, we showed that for a class of minimal left-right extensions, a built-in mechanism exists which naturally solves the tachyonic slepton problem and provides new alternatives to the MSSM that also have automatic R-parity conservation. In this paper, we discuss how electroweak symmetry breaking arises in this model through an NMSSM-like low energy theory with a singlet VEV, induced by the structure of the left-right extension and of the right magnitude. We then study the phenomenological issues and find: the LSP is an Higgsino-wino mix, new phenomenology for chargino decays to the LSP, degenerate same generation sleptons and a potential for a mild squark-slepton degeneracy. We also discuss possible collider signatures and the feasibility of dark matter in this model.

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