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arXiv 2104.03296hep-ph
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μ介子g-2结果对轻子质量矩阵味结构的意义

Implications of the Muon g-2 result on the flavour structure of the lepton mass matrix

Lorenzo Calibbi, M. L. López-Ibáñez, Aurora Melis, Oscar Vives

摘要:

费米实验室的μ g-2实验证实了与标准模型预测的异常磁矩的差异,这表明新物理学的规模很小。在低能量下破坏的味道对称性可以解释这种差异,但这些模型受到更多的限制,因为它们也会在偶极矩矩阵中产生非对角项。因此,如果我们假设观测到的μ子$g-2$中的差异是由低能味对称性的贡献来解释的,轻子味破坏过程可以约束轻子质量矩阵的结构,因此味对称性本身预测这些结构。我们将这些想法应用到几个流行的轻子部门的离散味对称,如$Δ(27)$,$A_4$,和$A_5 \ltimes {\rm CP}$。

英文摘要:

The confirmation of the discrepancy with the Standard Model predictions in the anomalous magnetic moment by the Muon g-2 experiment at Fermilab points to a low scale of new physics. Flavour symmetries broken at low energies can account for this discrepancy but these models are much more restricted, as they would also generate off-diagonal entries in the dipole moment matrix. Therefore, if we assume that the observed discrepancy in the muon $g-2$ is explained by the contributions of a low-energy flavor symmetry, lepton flavour violating processes can constrain the structure of the lepton mass matrices and therefore the flavour symmetries themselves predicting these structures. We apply these ideas to several discrete flavour symmetries popular in the leptonic sector, such as $Δ(27)$, $A_4$, and $A_5 \ltimes {\rm CP}$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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