标题： 从共形和保custodial 对称性得到的电弱能级——“保custodial 自然性” 显示英文标题

标题： Electroweak hierarchy from conformal and custodial symmetry -- "Custodial Naturalness"

摘要： 我引入了“保 Custodial 自然性”这一概念来解释电弱（EW）尺度层次结构的起源。 保 Custodial 自然性基于经典的标度不变性以及标准模型（SM）标量部门的 Custodial 对称性的扩展。 在一个最小实现中，这需要一个单一的新复杂数量场，它在新的 U(1) 规范对称性下带电，部分与$B-L$重叠。 经典标度不变性和高标度标量部门 SO(6) Custodial 对称性通过量子效应被辐射破缺，这些量子效应通过维度变换生成一个新的中间尺度。 小等级问题得到了解决，因为希格斯玻色子作为自发破缺的 SO(6) Custodial 对称性的伪 Nambu-Goldstone 玻色子（pNGB）出现。 保 Custodial 自然性的最小实现具有与 SM 相同数量的参数，并预测了可测试的新物理，表现为一个重的$Z'$以及一个轻但接近不可见的胀子。 显示英文摘要

摘要： I introduce the idea of "Custodial Naturalness" to explain the origin of the electroweak (EW) scale hierarchy. Custodial Naturalness is based on classical scale invariance as well as an extension of the Standard Model (SM) scalar sector custodial symmetry. In a minimal realization, this requires a single new complex scalar field charged under a new U(1) gauge symmetry, which partially overlaps with $B-L$. Classical scale invariance and the high-scale scalar sector SO(6) custodial symmetry are radiatively broken by quantum effects that generate a new intermediate scale by dimensional transmutation. The little hierarchy problem is solved because the Higgs boson arises as pseudo-Nambu-Goldstone boson (pNGB) of the spontaneously broken SO(6) custodial symmetry. The minimal realization of Custodial Naturalness has the same number of parameters as the SM and predicts testable new physics in the form of a heavy $Z'$ as well as a light but close-to invisible dilaton.