论文标题
修改后的Lepton耦合和Cabibbo-角异常
Modified lepton couplings and the Cabibbo-angle anomaly
论文作者
论文摘要
已经观察到了Cabibbo角的不同测定之间的显着差异。在这里，我们指出，这种“ Cabibbo-gandle Anomaly”可以通过违反中微子领域的新物理（NP）的Lepton Flavor普遍性（LFU）来解释。但是，与标准模型量规玻色子的修改的中微子耦合也影响了许多对LFU违规敏感的可观察到的物体，为了评估这种解释的可行性，必须考虑在内。因此，我们执行独立于模型的贝叶斯全局分析，发现电子和MUON中微子耦合的非零修改是优选的，以超过$ 99.99 \％\，{\ rm c.l.} $（对应于$ 4 \ \ 4 \，σ$）。我们的结果表明，在MUON部门中的建设性效应是必要的，这意味着丢弃了带有右手中微子的简单模型，并且需要更复杂的NP模型。
Significant discrepancies between the different determinations of the Cabibbo angle have been observed. Here, we point out that this "Cabibbo-angle anomaly" can be explained by lepton flavour universality (LFU) violating New Physics (NP) in the neutrino sector. However, modified neutrino couplings to Standard Model gauge bosons also affect many other observables sensitive to LFU violation, which have to be taken into account in order to assess the viability of this explanation. Therefore, we perform a model-independent Bayesian global analysis and find that non-zero modifications of electron and muon neutrino couplings are preferred at more than $99.99\%\,{\rm C.L.}$ (corresponding to more than $4\,σ$). Our results show that constructive effects in the muon sector are necessary, meaning simple models with right-handed neutrinos are discarded and more sophisticated NP models required.
