Tri-bimaximal Mixing from Cascades

Details Tri-bimaximal Mixing from Cascades Tri-bimaximal Mixing from Cascades

2008-04-25

arxiv.org/abs/0804.4055v4

Phys.Rev.D78:113002,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

26 pages

Scientific paper

10.1103/PhysRevD.78.113002

We study fermion mass matrices of the cascade form which are compatible with the tri-bimaximal lepton mixing and generation mass hierarchy. The flat-cascade lepton matrices imply a parameter-independent relation among the mixing angles and mass eigenvalues. The relation has several indications that the atmospheric neutrino mixing angle is close to maximal and the other two angles have a correlation independently of neutrino mass eigenvalues. We also discuss phenomenological aspects of the cascade matrices; flavor-violating rare decays of charged leptons, thermal leptogenesis, and leptonic CP violation. Possible dynamical origins of the cascades are illustrated based on flavor symmetry and in higher-dimensional theory.

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