Comprehensive unification and the flavor puzzle
Mario Reig (IFIC, Valencia)

Motivated by the idea of Comprehensive Unification, we propose a minimal bottom-up theory with an SO(3) flavor symmetry assembling the three families of matter. This symmetry leads to a “golden” formula relating charged lepton and down-type quark masses, accounting for the observed hierarchies, and providing a dynamical understanding of the CKM matrix elements. In this framework, the understanding of flavor and the strong CP problem could be closely related. The theory provides an adequate implementation of an anomalous Peccei-Quinn symmetry broken at the family symmetry breaking scale. If the latter is also chosen to coincide with the neutrino seesaw scale we relate four of the major open challenges in particle physics.

arXiv reference:
Reig, Valle, Vaquera-Araujo, Wilczek https://arxiv.org/pdf/1706.03116.pdf