通向新物理学的桥梁：提出$a_μ$的新解释并复兴旧解释
A bridge to new physics: proposing new -- and reviving old -- explanations of $a_μ$
摘要：
在对μ子的反常磁矩$a_μ$和标准模型预测的联合测量中，$4.2\,σ$张力强烈地暗示了超越标准模型的物理学的存在。按照标准模型有效场论的方法，我们研究了一个特定的拓扑结构，\emph{bridge}图，它给出了一个手性增强的贡献$a_μ$。我们分类所有可能的2-和3-字段SM扩展，可以产生这种贡献，并为他们提供完整的$a_μ$结果。在我们的方法中，我们发现，以前在文献中被丢弃的几个2场费米子标量扩展-当只考虑Yukawa抑制的贡献-实际上可以是可行的模型来解释所观察到的异常。此外，生成桥接图的3-域扩展表示一类新的模型来解释$a_μ$。我们探讨了一个特殊的3场扩展，除了解释$a_μ$，也可以解释中性$B$介子异常和Cabibbo角异常。我们提出了完整的单圈匹配这个模型和单圈现象学研究。
英文摘要：
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.
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