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arXiv 1209.2115hep-ph
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尺度不变NMSSM中125 GeV希格斯粒子的自然岛

Natural Islands for a 125 GeV Higgs in the scale-invariant NMSSM

Kaustubh Agashe, Yanou Cui, Roberto Franceschini

摘要:

我们研究了125 GeV的标准模型类希格斯玻色子是否可以以一种在各个方面都很自然的方式容纳在标度不变的NMSSM中,即,不仅是停止质量,因此它的环贡献的希格斯质量的自然大小,但我们不允许显着调整的NMSSM参数以及。我们追求尽可能多的分析方法,提供清晰的见解各种方式来容纳这样的希格斯质量,同时进行补充的数值分析。我们认为这两种情况下的单态比SM-样希格斯粒子更重和更轻。当A项很小时,我们发现NMSSM在大统一尺度下是微扰的,即使我们调整NMSSM的参数,也不可能得到125 GeV的Higgs质量。如果我们允许某些耦合在大统一理论尺度以下变得非微扰,那么非调谐选项意味着单重态自耦合kappa大于单重态-希格斯耦合lambda,后者本身是1阶。这导致了这些耦合在弱标度附近的朗道极点,特别是在~10^4 TeV以下。在微扰和非微扰NMSSM中,允许大的A_lambda,A_kappa给出了“更多的空间”来容纳125 GeV的希格斯,但可能需要调整这些A项。在我们的分析中,我们还进行了仔细的研究,从所需的真空拟合125 GeV希格斯粒子,这是补充现有文献的全局稳定性的参数空间上的约束。特别是,随着单重态-希格斯耦合λ的增加,真空稳定性成为一个更加严重的问题。

英文摘要:

We study whether a 125 GeV standard model-like Higgs boson can be accommodated within the scale-invariant NMSSM in a way that is natural in all respects, i.e., not only is the stop mass and hence its loop contribution to Higgs mass of natural size, but we do not allow significant tuning of NMSSM parameters as well. We pursue as much as possible an analytic approach which gives clear insights on various ways to accommodate such a Higgs mass, while conducting complementary numerical analyses. We consider both scenarios with singlet-like state being heavier and lighter than SM-like Higgs. With A-terms being small, we find for the NMSSM to be perturbative up to GUT scale, it is not possible to get 125 GeV Higgs mass, which is true even if we tune parameters of NMSSM. If we allow some of the couplings to become non-perturbative below the GUT scale, then the non-tuned option implies that the singlet self-coupling, kappa, is larger than the singlet-Higgs coupling, lambda, which itself is order 1. This leads to a Landau pole for these couplings close to the weak scale, in particular below ~10^4 TeV. In both the perturbative and non-perturbative NMSSM, allowing large A_lambda, A_kappa gives "more room" to accommodate a 125 GeV Higgs, but a tuning of these A-terms may be needed. In our analysis we also conduct a careful study of the constraints on the parameter space from requiring global stability of the desired vacuum fitting a 125 GeV Higgs, which is complementary to existing literature. In particular, as the singlet-Higgs coupling lambda increases, vacuum stability becomes more serious of an issue.

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