A model for trimaximal lepton mixing

Status of Trimaximal Neutrino Mixing

Trimaximal mixing is the mixing hypothesis with maximal symmetry. In trimaximal mixing there remains a still worrying conflict between the large values of ∆m preferred by the atmospheric fits (possibly supported by the early K2K data) and reactor limits on νe-mixing. However, the latest solar results do seem to point to energy-independent (ie. ‘no-scale’) solar solutions, like the trimaximal so...

Lepton Mixing and Seesaw Mechanism

Solar Neutrinos and Lepton Mixing

With latest experimental data the solar neutrino problem enters new phase when crucial aspects of the problem can be formulated in an essentially (solar) model independent way. Original neutrino fluxes can be considered as free parameters to be found from the solar neutrino experiments. Resonance flavour conversion gives the best fit of all experimental results. Already existing data allow one ...

A hyperbolic parametrization of lepton mixing for small Ue3

We use hyperbolic functions to parametrize lepton mixing matrix using only one input parameter φ. This matrix has three mixing angles as outputs therefore giving two predictions. In particular it predicts Ue3 = 0 besides predicting correct solar and atmospheric mixing. We confine us to real φ. For complex φ mixing matrix is no longer unitary. Next we accentuate this unitary mixing matrix with a...

S4 as a natural flavor symmetry for lepton mixing

Group theoretical arguments seem to indicate the discrete symmetry S4 as the minimal flavor symmetry compatible with tribimaximal neutrino mixing. We prove in a model-independent way that indeed S4 can realize exact tribimaximal mixing through different symmetry breaking patterns. We present two models in which lepton tribimaximal mixing is realized in different ways and for each one we discuss...