Speaker
Description
We discuss a mechanism in which the masses of the third, second, and first generation charged fermions are generated at tree level, 1-loop, and 2-loop levels, respectively. In this mechanism, loop-generated masses are obtained through fermionic self-energy corrections induced by heavy gauge bosons of a new flavorful $U(1)_F$ symmetry, which have flavor-violating interactions with Standard Model fermions. Phenomenologically, the flavor-violating couplings $Q_{ij}$ are desired to have $|Q_{12}|<|Q_{23}|,|Q_{13}|$ because constraints from $K^0$-$\overline{K}^0$ mixing and $\mu$-$e$ conversion in nuclei, involving first and second family fermions, are more stringent than others. We establish a framework to achieve this condition and quantify the optimal flavor violations required to implement the radiative mass generation mechanism. This framework lowers the new physics scale by nearly two orders compared to other radiative mass models. We present an explicit anomaly-free model based on a flavor non-universal $U(1)_F$, incorporating the mechanism and predicting a lower bound on the new physics scale at $10^3$ TeV. Additionally, we discuss the possibility of light neutrino masses within this class of models.
| Track type | Flavour Physics |
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