arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2206.04077hep-ph
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大色轴

Grand Color Axion

Alessandro Valenti, Luca Vecchi, Ling-Xiao Xu

摘要:

我们提出了一个模型,解决了强CP问题,通过一个轴子参数比标准重。在这幅图中,标准模型夸克被嵌入到一个更大的非阿贝尔巨色群中,在高尺度下,巨色群分裂成普通的QCD和一个额外的约束动力学,在这个约束动力学下,奇异的手征费米子带电。重要的是,轴子的真空期望值自动放松到零,因为除了拓扑角中编码的那些之外,唯一可重正化的显式CP破坏源包含在标准模型汤川耦合中,因此被非常抑制。轴子势受新限制群的尺度控制,并且比QCD贡献大得多,使得其动力学较少暴露于所谓的“轴子质量问题”。潜在的可观察到的校正的有效拓扑角也可以出现,在我们的模型以及在一个大类的重轴子的情况下,从非重正化的Peccei-Quinn守恒相互作用,这引入了一个新的“重轴子质量问题”。我们的模型有一个非常小的字段内容,它完全依赖于规范不变性,并不需要引入额外的对称性超出通常的假设Peccei和奎因。现象学非常丰富,可以在对撞机上进行测试,也可以通过宇宙学观测进行测试。一个特别有趣的部分参数空间预测一个可见的轴子的质量以上的GeV和衰变常数大于几个TeV。

英文摘要:

We present a model that solves the strong CP problem via an axion parametrically heavier than the standard one. Within this picture the Standard Model quarks are embedded into a larger non-abelian Grand Color group that at high scales splits into ordinary QCD and an additional confining dynamics under which exotic chiral fermions are charged. Crucially, the vacuum expectation value of the axion is automatically relaxed to zero because the only renormalizable source of explicit CP violation, beyond those encoded in the topological angles, is contained in the Standard Model Yukawa couplings, and is therefore very suppressed. The axion potential is controlled by the scale of the new confining group and is much larger than the QCD contribution, such that its dynamics is less exposed to the so-called "axion quality problem". Potentially observable corrections to the effective topological angle can also arise, in our model as well as in a large class of heavy axion scenarios, from non-renormalizable Peccei-Quinn-conserving interactions, which introduce a new "heavy axion quality problem". Our model has a very minimal field content, it relies entirely on gauge invariance and does not require the introduction of additional symmetries beyond the usual one postulated by Peccei and Quinn. The phenomenology is very rich and can be tested at colliders as well as via cosmological observations. A particularly interesting portion of parameter space predicts a visible axion of mass above the GeV and decay constant larger than a few TeV.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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