Neutrino anarchy from quiver gauge theories

by Volansky, T. (Weizmann Institute)

Friday 8 Dec 2006, 14:00 → 15:00 Europe/Zurich

TH Auditorium (CERN)

The neutrino sector seems to have a very different flavour structure from the (small and hierarchical) flavour parameters of the charged fermions. Why is that? In this talk we offer a possible explanation by considering a large class of models where the SU(5) gauge symmetry and a Froggatt-Nielsen (FN) Abelian flavour symmetry arise from a quiver gauge theory. An intriguing feature of these models is a relation between the gauge representation and the horizontal charge, leading to a restricted set of possible FN charges. Requiring that quark masses are hierarchical, the lepton flavour structure is uniquely determined. In particular, neutrino mass anarchy is predicted.