ar X iv : h ep - p h / 05 08 31 4 v 2 8 S ep 2 00 5 The 2 - 3 symmetry : Flavor Changing b , τ Decays and Neutrino Mixing

ar X iv : h ep - p h / 05 08 31 4 v 3 2 3 N ov 2 00 5 The 2 - 3 symmetry : Flavor Changing b , τ Decays and Neutrino Mixing

The observed pattern of neutrino mixing may be the result of a 2-3( μ−τ) symmetry in the leptonic sector. We consider a two Higgs doublet model with a 2-3 symmetry in the down type quark and the charged lepton sector. The breaking of the 2-3 symmetry by the strange quark mass and the muon mass leads to FCNC in the quark sector and the charged lepton sector that are suppressed by ms mb and mμ mτ...

ar X iv : h ep - p h / 05 08 31 4 v 1 3 1 A ug 2 00 5 The 2 - 3 symmetry : Flavour Changing b , τ Decays and Neutrino Mixing

The observed pattern of neutrino mixing may be the result of a 2-3( μ−τ) symmetry in the leptonic sector. We consider a two higgs doublet model with a 2-3 symmetry in the down type quark and the charged lepton sector. The breaking of the 2-3 symmetry by the strange quark mass and the muon mass leads to FCNC in the quark sector and the charged lepton sector that are suppressed by ms mb and mμ mτ...

ar X iv : h ep - p h / 03 05 27 4 v 1 2 6 M ay 2 00 3 Impact of U e 3 on Neutrino Models 1 Morimitsu Tanimoto

We have discussed the impact of U e3 on the model of the neutrino mass matrix. In order to get the small U e3 , some flavor symmetry is required. Typical two models are investigated. The first one is the model in which the bi-maximal mixing is realized at the symmetric limit. The second one is the texture zeros of the neutrino mass matrix.

ar X iv : h ep - p h / 06 05 13 6 v 1 1 1 M ay 2 00 6 Lepton Flavor Violating τ and μ decays

ar X iv : h ep - p h / 06 12 21 4 v 1 1 8 D ec 2 00 6 Flavor S 4 ⊗ Z 2 symmetry and neutrino mixing

We present a model of the lepton masses and flavor mixing based on the discrete group S 4 ⊗Z 2. In this model, all the charged leptons and neutrinos are assigned to the 3 α representation of S 4 in the Yamanouchi bases. The charged lepton and neutrino masses are mainly determined by the vacuum expectation value structures of the Higgs fields. Our model predicts a nearly tri-bimaximal lepton fla...