A bottom-up analysis of horizontal symmetry

Details A bottom-up analysis of horizontal symmetry A bottom-up analysis of horizontal symmetry

2009-07-13

arxiv.org/abs/0907.2206v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

The group-theoretical method used to derive horizontal symmetry from neutrino mixing is reviewed and expanded. Some misunderstanding in the literature regarding the result is clarified. The method used previously to find vacuum alignments of $S_4$ is applied to compute those of $A_4$ and $S_3$. A study of effective theories based on these three groups shows that in each case there are just enough free parameters to fit all the masses and the remaining mixing parameters. This places constraint on dynamical models because effective theories are just dynamical models with the right-handed fermions integrated out. How quarks may fit into this scheme is briefly discussed.

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