Hybrid seesaw neutrino masses with A(4) family symmetry

作者：Chen SL; Frigerio M^*; Ma E

来源：Nuclear Physics B, 2005, 724(1-2): 423-431.

DOI：10.1016/j.nuclphysb.2005.07.012

We consider the scenario in which neutrino data are explained by the interplay of type I and II seesaw terms in the Majorana neutrino mass matrix Mu(v) = Mu(L) - MDMR-1 M-D(T). We construct a predictive model with Mu L proportional to the unit matrix, 3 diagonal texture zeros in Mu(R), and Mu(D) diagonal. We show how this pattern can be maintained by the non-Abelian discrete symmetry A(4), and discuss its phenomenological consequences. It turns out that the two types of seesaw give contributions of the same order to M-v. In the CP conserving case, we find sin theta(13) approximate to 2/(tan 2 theta(23) tan 2 theta(12)) and we predict inverted (normal) ordering of the mass spectrum for tan(2) theta(12) < 0.5 (> 0.5).

• 出版日期2005-9-19