使第三族超电荷模型自然化以解释中性流 $B-$反常
高能物理 - 唯象学
2020-08-03 v5 高能物理 - 实验
摘要
我们考虑对第三族超电荷模型的一种变形，这可以说使该模型更为自然。自发破缺的、依赖于族的 规范对称性的额外非零电荷被赋予第二族轻子，而第三族轻子的电荷从其超电荷发生变形，使得 规范对称性保持无反常。第二族 轻子电荷允许 与缪子耦合，而无需假设大的带电轻子混合，后者有违反严格轻子味违反界限的风险。在这一变形版本中，只有底和顶的汤川耦合在可重整化层次上生成，而陶子汤川耦合缺失。 以组合 介导一个超出标准模型的有效 顶点贡献，并能够拟合味改变中性流 介子衰变中标准模型预言与其测量之间的明显差异，同时在 时规避来自直接 搜索及其他测量的当前约束。
引用
@article{arxiv.1905.10327,
title = {Naturalising the Third Family Hypercharge Model for Neutral Current $B-$Anomalies},
author = {B. C. Allanach and Joe Davighi},
journal= {arXiv preprint arXiv:1905.10327},
year = {2020}
}
备注
13 pages, 6 figures. More accurate cross-section calculation taking off-shell Z' effects into account. Little qualitative difference, although the lower limit for the Z prime mass is slightly larger (now 1.2 TeV rather than 0.8 TeV as in the published version). Two minus sign typos in the definition of the Lagrangian have also been corrected. (Previous version accepted for publication in EPJC.)