A Realistic U(2) Model of Flavor

Understand

We propose a simple $U(2)$ model of flavor compatible with an $SU(5)$ GUT structure.

• All hierarchies in fermion masses and mixings arise from powers of two small parameters that control the $U(2)$ breaking.
• In contrast to previous $U(2)$ models this setup can be realized without supersymmetry and provides an excellent fit to all SM flavor observables including neutrinos.
• We also consider a variant of this model based on a $D_6 \times U(1)_F$ flavor symmetry, which closely resembles the $U(2)$ structure, but allows for Majorana neutrino masses from the Weinberg operator.