U(2)-like Flavor Symmetries and Approximate Bimaximal Neutrino Mixing

Details U(2)-like Flavor Symmetries and Approximate Bimaximal Neutrino Mixing U(2)-like Flavor Symmetries and Approximate Bimaximal Neutrino Mixing

2001-09-13

arxiv.org/abs/hep-ph/0109120v3

Phys.Rev. D65 (2002) 013011

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages RevTex4, 2 figures

Scientific paper

10.1103/PhysRevD.65.013011

Models involving a U(2) flavor symmetry, or any of a number of its non-Abelian discrete subgroups, can explain the observed hierarchy of charged fermion masses and CKM angles. It is known that a large neutrino mixing angle connecting second and third generation fields may arise via the seesaw mechanism in these models, without a fine tuning of parameters. Here we show that it is possible to obtain approximate bimaximal mixing in a class of models with U(2)-like Yukawa textures. We find a minimal form for Dirac and Majorana neutrino mass matrices that leads to two large mixing angles, and show that our result can quantitatively explain atmospheric neutrino oscillations while accommodating the favored, large angle MSW solution to the solar neutrino problem. We demonstrate that these textures can arise in models by presenting a number of explicit examples.

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