Golden ratio lepton mixing and nonzero reactor angle withA5

Reactor mixing angle from hybrid neutrino masses

In terms of its eigenvector decomposition, the neutrino mass matrix (in the basis where the charged lepton mass matrix is diagonal) can be understood as originating from a tribimaximal dominant structure with small deviations, as demanded by data. If neutrino masses originate from at least two different mechanisms, referred to as “hybrid neutrino masses”, the experimentally observed structure n...

The Weak Mixing Angle From TeV Scale Quark-Lepton Unification

Unified theories based on an extended left-right symmetric group, SU(4) × SU(2), are constructed in five dimensions. The compactification scale is assumed to be only a loop factor above the weak scale, so that the weak mixing angle is predicted to be close to its tree level value of 0.239. Boundary conditions in the 5th dimension break SU(4) → SU(3)×U(1)B−L , removing powerful constraints from ...

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 ...

Limits on the neutrino mass and mixing angle from pion and lepton decays.

Motivated by a recent rather surprising conclusion based on the 1992 PDG data on the pion, kaon and lepton decays that if three generations of neutrinos are assumed to be massive and mixed, the heaviest neutrino, ν 3 , could have a mass in the range, 155 MeV < ∼ m 3 < ∼ 225 MeV, we have analyzed the latest 1995 data on the leptonic decays of pion, µ and τ with the assumption that three generati...