论文标题
标准模型的标量扩展中违反托管对称性
Custodial Symmetry Violation in Scalar Extensions of the Standard Model
论文作者
论文摘要
从CDF协作中对W玻色子质量进行的新测量表明，标准模型预测的张力很大，这证明了标量领域中违反托管对称性的情况。我们研究了标准模型的标量扩展，可以将其分为两个类别，即具有托管对称性的标量扇区（Georgi-Machacek模型及其概括）和无托管对称性的标量扇区，并探索这些扩展如何适合电动eakeak Precision Pecision Pecision Data和CDF New $ _W $。受欢迎的倾斜参数来自循环贡献中的大质量分裂，或者是在树级上打破托管对称性的大型真空期望值。特别是，我们发现在标量扩展方案中允许$ \ MATHCAL {O}（100）$ GEV新粒子。
The new measurement of the W boson mass from the CDF collaboration shows a significant tension with the Standard Model prediction, which evidences violation of custodial symmetry in the scalar sector. We study the scalar extensions of the Standard Model, which can be categorized into two classes, scalar sector with custodial symmetry (Georgi-Machacek model and its generalizations) and scalar sector without custodial symmetry, and explore how these extensions fit to the electroweak precision data and the CDF new $m_W$ . The favored oblique parameters are coming from either the large mass splitting in the multiplet via the loop contribution or the large vacuum expectation value which breaks custodial symmetry at the tree level. In particular, we find that $\mathcal{O}(100)$ GeV new particles are allowed in the scalar extension scenarios.
