[SEMINARI] SEMINAR: Margarida Rebelo, Leptogenesis, Yukawa textures and Weak-Basis Invariants

[German Rodrigo Garcia]

Leptogenesis, Yukawa textures and Weak-Basis Invariants

Margarida Rebelo
CFTP, Instituto Superior Tecnico, LISBOA
Thursday, 22 of March of 2007     12:00 PM
Theoretical Physics Seminars room
Abstract

We show that a large class of sets of leptonic texture zeros considered in 
the literature imply the vanishing of certain CP-odd weak-basis 
invariants. These invariant conditions enable one to recognize a flavour 
model corresponding to a set of texture zeros, when written in an 
arbitrary weak-basis where the zeros are not manifest. We also analyse the 
role of texture zeros in allowing for a connection between leptogenesis 
and low-energy leptonic masses, mixing and CP violation. For some of the 
textures the variables relevant for leptogenesis can be fully determined 
in terms of low energy parameters and heavy neutrino masses.