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arXiv 1304.0293hep-ph
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我们能从126 GeV希格斯玻色子中学到什么?- 等级问题和真空的稳定性-

What can we learn from the 126 GeV Higgs boson for the Planck scale physics ? - Hierarchy problem and the stability of the vacuum -

Satoshi Iso

摘要:

希格斯粒子在126 GeV左右的发现给了我们一个关于希格斯势起源的重要提示。运行的四次自耦合减少,并在非常高的能量标度中的某个地方过零。它通常被认为是标准模型(SM)真空不稳定的信号,但它也可以表明电弱尺度和普朗克尺度之间的物理联系。此外,LHC实验以及味物理实验对SM之外的物理给出了强有力的约束。它促使我们重新考虑普遍采用的超规范物理的研究方法,即基于普朗克尺度下规范统一的研究方法和由此产生的等级问题。最近的实验的动机,我们首先重新审视的层次问题,并考虑一个替代的appoach的基础上,没有希格斯质量项的SM的经典保形。在这次演讲中,我回顾了我们最近提出的一个B-L扩展的SM与一个平坦的希格斯势在普朗克尺度。这个模型可以作为层次问题的另一种解决方案,也可以用来解释宇宙中的中微子振荡和重子不对称性。假设Higgs粒子在Planck尺度下具有平坦的势,我们证明了B-L对称性在TeV尺度下通过Coleman-Weinberg机制辐射破缺,并通过辐射产生的标量混合触发电弱对称性破缺.这两个破缺尺度的比值由B-L规范耦合动态地决定。

英文摘要:

The discovery of the Higgs particle at around 126 GeV has given us a big hint towards the origin of the Higgs potential. The running quartic self-coupling decreases and crosses zero somewhere in the very high energy scale. It is usually considered as a signal of the instability of the standard model (SM) vacuum, but it can also indicate a link between the physics in the electroweak scale and the Planck scale. Furthermore, the LHC experiments as well as the flavor physics experiments give strong constraints on the physics beyond the SM. It urges us to reconsider the widely taken approach to the physics beyond the SM (BSM), namely the approach based on the gauge unification below the Planck scale and the resulting hierarchy problem. Motivated by the recent experiments, we first revisit the hierarchy problem and consider an alternative appoach based on a classical conformality of the SM without the Higgs mass term. In this talk, I review our recent proposal of a B-L extension of the SM with a flat Higgs potential at the Planck scale. This model can be an alternative solution to the hierarchy problem as well as being phenomenologically viable to explain the neutrino oscillations and the baryon asymmetry of the universe. With an assumption that the Higgs has a flat potential at the Planck scale, we show that the B-L symmetry is radiatively broken at the TeV scale via the Coleman-Weinberg mechanism, and it triggers the electroweak symmetry breaking through a radiatively generated scalar mixing. The ratio of these two breaking scales is dynamically determined by the B-L gauge coupling.

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