Majorana-neutrino anarchy vs. charged-fermion hierarchy

by Yael Shadmi (Technion, Haifa)

Friday 30 Jul 2004, 14:00 → 15:00 Europe/Zurich

TH Auditorium (CERN)

We show that the flavour structure of Majorana neutrinos may be qualitatively different from that of charged fermions. Specifically, in Froggatt-Nielsen models, the difference stems from the fact that charged fermion mass matrices depend on a single ratio of two scales, while neutrino mass matrices are sensitive to a third scale -- the scale of lepton number violation. In particular, neutrino mass matrices may exhibit anarchy even when the neutrinos carry different horizontal charges.