论文标题
通往新物理学的桥梁：提议新的 - 恢复旧的 - $a_μ$的解释
A bridge to new physics: proposing new -- and reviving old -- explanations of $a_μ$
论文作者
论文摘要
$ 4.2 \，σ$张力在MUON的异常磁矩（$a_μ$）的组合测量中，标准模型预测强烈表明，超越标准模型物理学的存在。遵循标准模型有效的现场理论方法，我们研究了特定拓扑，即\ emph {bridge}图，该图为$a_μ$的贡献提供了大幅增强的贡献。我们对所有可能产生此贡献的2个和3场SM扩展名进行了分类，并为他们提供了整个$A_μ$结果。在我们的方法中，我们发现以前在文献中丢弃的几个2场费米量尺度扩展（仅考虑Yukawa抑制的贡献时）实际上可以是可行的模型来解释观察到的异常。此外，生成桥接图的三场扩展代表了新的型号，以占$a_μ$。我们探索了一个特定的3场扩展名，除了解释$A_μ$外，还可以解释中性$ b $ -Meson异常和Cabibbo Angle Anomaly。我们介绍了该模型的完整一环匹配和一环现象学研究。
The $4.2\,σ$ tension in the combined measurement of the anomalous magnetic moment of the muon, $a_μ$, and the Standard Model prediction strongly suggests the existence of beyond the Standard Model physics. Following the Standard Model Effective Field Theory approach, we study a particular topology, the \emph{bridge} diagram, which gives a chirally enhanced contribution to $a_μ$. We classify all possible 2- and 3-field SM extensions that can generate this contribution and present the full $a_μ$ result for them. Within our approach, we find that several 2-field fermion-scalar extensions which had been previously discarded in the literature -- when only the Yukawa-suppressed contribution was considered -- can actually be viable models to explain the observed anomaly. Furthermore, the 3-field extensions which generate the bridge diagram represent a new class of models to account for $a_μ$. We explore a particular 3-field extension which, beyond explaining $a_μ$, can also account for the neutral $B$-meson anomalies and the Cabibbo angle anomaly. We present the full one-loop matching for this model and a one-loop phenomenological study.
