Theoretical motivations for the precision measurement of the oscillation parameters

Abstract

We discuss two theoretical motivations of precision measurements of oscillation parameters. One is the guidance for flavour model building with flavour symmetries, and the other is the connection with the origin of matter-antimatter asymmetry. We also present our recent progress in these aspects, a new approach of flavour model building based on cross coupling in the flavon potential and a novel mechanism of leptogenesis via phase transition.

Grand unification and CP violation

“…In a talk in the flavor physics parallel session here, theories on mixing angles were classified as [24] (i) SM × (family symmetry), (ii) GUT × (family symmetry), (iii) Unification of GUT families in a simple gauge group, where the family symmetry was considered as a discrete group such as A 4 . In Fig.…”