Abstract
We present here two concrete examples of models where a sub-TeV scale breaking of their respective and flavor symmetries is able to account for the recently observed discrepancy in the muon anomalous magnetic moment, . Similarities in the flavor structures of the charged-lepton Yukawa matrix and dipole matrix yielding give rise to strong constraints on low-scale flavor models when bounds from lepton flavor violation (LFV) are imposed. These constraints place stringent limits on the off-diagonal Yukawa structure, suggesting a mostly (quasi)diagonal texture for models with a low flavor breaking scale . We argue that many of the popular flavor models in the literature designed to explain the fermion masses and mixings are not suitable for reproducing the observed discrepancy in , which requires a delicate balance of maintaining a low flavor scale while simultaneously satisfying strong LFV constraints.
- Received 10 January 2022
- Accepted 4 February 2022
DOI:https://doi.org/10.1103/PhysRevD.105.035021
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society