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arXiv 2003.06633hep-ph
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味模型中的μ子和电子$g-2$及轻子质量

Muon and electron $g-2$ and lepton masses in flavor models

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

摘要:

严格的实验约束$μ\rightarrow e γ$是兼容的同时和相当大的新的物理贡献的电子和μ子异常磁矩$(g-2)_\ell$($\ell=e,\,μ$),只有当我们假设一个非平凡的风味结构的偶极算子系数。我们提出了一种机制,其中实现的$(g-2)_\ell$校正是明显相关的质量生成通过味对称。费米子质量的辐射flavon修正对反常磁矩有贡献。在这个框架中,我们介绍了一个非平凡的$\mathcal{O}(1)$四次耦合的标量势的手征增强。我们表明,μ子和电子异常可以在参数空间的广阔区域中同时解释,预测的矢量状介体质量大至$M_χ\in [0.6,2.5]$ ~TeV。

英文摘要:

The stringent experimental bound on $μ\rightarrow e γ$ is compatible with a simultaneous and sizable new physics contribution to the electron and muon anomalous magnetic moments $(g-2)_\ell$ ($\ell=e,\,μ$), only if we assume a non-trivial flavor structure of the dipole operator coefficients. We propose a mechanism in which the realization of the $(g-2)_\ell$ correction is manifestly related to the mass generation through a flavor symmetry. A radiative flavon correction to the fermion mass gives a contribution to the anomalous magnetic moment. In this framework, we introduce a chiral enhancement from a non-trivial $\mathcal{O}(1)$ quartic coupling of the scalar potential. We show that the muon and electron anomalies can be simultaneously explained in a vast region of the parameter space with predicted vector-like mediators of masses as large as $M_χ\in [0.6,2.5]$~TeV.

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