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arXiv 1905.05656hep-thhep-ph
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从普朗克尺度到弱尺度--经典共形双标量系统的质量尺度生成

Weak scale from Planck scale -- Mass Scale Generation in Classically Conformal Two Scalar System --

Junichi Haruna, Hikaru Kawai

摘要:

在标准模型中,弱尺度是唯一具有质量维度的参数。这意味着标准模型本身并不能解释弱标度的起源。另一方面,从最近的加速器实验结果来看,除了一些小的修正外,标准模型增加了成为高达普朗克尺度的有效理论的可能性。从这些事实中,很自然地推断出弱尺度是由普朗克尺度的某些动力学决定的。为了回答这个问题,我们以多点临界原理为线索,把经典共形的$\mathbb{Z}_2\times \mathbb{Z}_2$不变双标量模型看作是弱标度由普朗克标度动态生成的极小模型.该模型只包含两个实标量场,不包含任何费米子和规范场。在这个模型中,由于Coleman-Weinberg机制,一个标量场自发地打破了$\mathbb{Z}_2$对称性,真空期望值与截止动量有关。我们使用1圈有效势,重整化群和大N极限来研究这一点。我们还研究了在Higgs门框架下将该模型与标准模型耦合,是否有可能重现Higgs场的质量项和真空期望值。在这种情况下,没有破坏$\mathbb{Z}_2$的一个标量场可以是暗物质的候选者,并且在适当的参数下具有大约几TeV的质量。另一方面,另一个标量场破坏了$\mathbb{Z}_2$,并具有几十GeV的质量。这些结果可以在不久的将来的实验中得到验证。

英文摘要:

In the standard model, the weak scale is the only parameter with mass dimensions. This means that the standard model itself can not explain the origin of the weak scale. On the other hand, from the results of recent accelerator experiments, except for some small corrections, the standard model has increased the possibility of being an effective theory up to the Planck scale. From these facts, it is naturally inferred that the weak scale is determined by some dynamics from the Planck scale. In order to answer this question, we rely on the multiple point criticality principle as a clue and consider the classically conformal $\mathbb{Z}_2\times \mathbb{Z}_2$ invariant two scalar model as a minimal model in which the weak scale is generated dynamically from the Planck scale. This model contains only two real scalar fields and does not contain any fermions and gauge fields. In this model, due to Coleman-Weinberg-like mechanism, one scalar field spontaneously breaks the $\mathbb{Z}_2$ symmetry with a vacuum expectation value connected with the cutoff momentum. We investigate this using the 1-loop effective potential, renormalization group and large N limit. We also investigate whether it is possible to reproduce the mass term and vacuum expectation value of the Higgs field by coupling this model with the standard model in the Higgs portal framework. In this case, the one scalar field that does not break $\mathbb{Z}_2$ can be a candidate for dark matter, and have a mass of about several TeV in appropriate parameters. On the other hand, the other scalar field breaks $\mathbb{Z}_2$ and has a mass of several tens of GeV. These results can be verified in near future experiments.

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