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arXiv 0705.4387hep-ph
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精细调谐问题的NMSSM解、精确电弱约束和最大LEP Higgs事件余度

The NMSSM Solution to the Fine-Tuning Problem, Precision Electroweak Constraints and the Largest LEP Higgs Event Excess

Radovan Dermisek, John F. Gunion

摘要:

我们提出了一个扩展的研究如何下一个最小的超对称模型很容易避免微调的电弱对称性破缺的SM样轻希格斯质量附近的$100\gev$,漂亮的一致性与精确的电弱数据,同时逃避LEP的约束,由于$h\to aa$的主导地位与$m_a<2m_b$衰变,使$a\to \tauptaum$或射流。$h\to b\anti b$的剩余$\sim 10%$分支比完美地解释了众所周知的在$\mh\sim 100\gev$的LEP过量。详细的模型参数的相关性和要求进行了讨论,作为一个功能$\tan(β)$。在NMSSM的微调,在MSSM的比较。我们还讨论了与$a$基本上是纯单线态的情况下,有质量$m_a>30\gev$,并主要衰变到$\gam\gam$导致$h\to aa\to 4\gam$希格斯信号的微调。

英文摘要:

We present an extended study of how the Next to Minimal Supersymmetric Model easily avoids fine-tuning in electroweak symmetry breaking for a SM-like light Higgs with mass in the vicinity of $100\gev$, as beautifully consistent with precision electroweak data, while escaping LEP constraints due to the dominance of $h\to aa$ decays with $m_a<2m_b$ so that $a\to \tauptaum$ or jets. The residual $\sim 10%$ branching ratio for $h\to b\anti b$ explains perfectly the well-known LEP excess at $\mh\sim 100\gev$. Details of model parameter correlations and requirements are discussed as a function $\tan(β)$. Comparisons of fine-tuning in the NMSSM to that in the MSSM are presented. We also discuss fine-tuning associated with scenarios in which the $a$ is essentially pure singlet, has mass $m_a>30\gev$, and decays primarily to $\gam\gam$ leading to an $h\to aa\to 4\gam$ Higgs signal.

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