The Standard Model fields can interact through non-renormalizable operators, the simplest of which is the one mentioned by Weinberg, with dimension 5. The list of all such operators up to dimension 6 is known and, since the last few years, so is the number of all effective interactions up to dimension 15. However, counting operators and listing them explicitly are different things. In this...
After discussing the general form of a Majorana neutrino mass matrix we will introduce a master parametrization for the Yukawa matrices in agreement with neutrino oscillation data. This parametrization extends previous results in the literature and can be used for any model that induces Majorana neutrino masses with the seesaw mechanism. The application of the master parametrization will be...
We analyse the phenomenological implication for lepton masses and mixing implied by the breaking of the discrete symmetries A5 x CP into the subgroups Z2 x CP in the neutrino sector and Z5 in the charged lepton sector with and without supersymmetry.
