Large lepton mixing in seesaw models - Coset-space family unification -

Large Lepton Mixing in a Coset-space Family Unification on E 7 /su(5)×u(1)

We study a coset-space unification model for families based on E 7 /SU(5)×U(1) 3. We find that qualitative structure of quark and lep-ton mass matrices in this model describes very well the observation. We stress, in particular, that the large mixing angle, sin 2 2θ νµντ ≃ 1, required for the atmospheric neutrino oscillation reported by the Su-perKamiokande collaboration, is naturally obtained,...

Large Lepton Flavor Mixing and E 6 - type Unification Models

There are experimental indications of large flavor mixing between νμ and ντ . In the unification models, in which the massless sector includes extra particles beyond the standard model, there possibly appear the mixings between quarks (leptons) and the extra particles. When large mixings occur, lepton flavor mixings can be quite different from quark flavor mixings. By taking the string inspired...

Lepton Mixing and Seesaw Mechanism

ar X iv : h ep - p h / 98 09 30 7 v 1 9 S ep 1 99 8 Large Lepton Mixing in Seesaw Models ∗ - Coset - space Family Unification -

We show that the large mixing between νµ and ντ observed by the SuperKamiokande collaboration is a quite natural prediction in a large class of seesaw models. This large mixing is basically due to the unparallel family structure suggested from the observed mass hierarchies in quark and lepton mass matrices. We show that the unparallel family structure is automatically realized in " coset-space ...

Large Lepton Flavor Mixing and E 6 -type Uniication Models

There are experimental indications of large avor mixing between and. In the uniication models, in which the massless sector includes extra particles beyond the standard model, there possibly appear the mixings between quarks (leptons) and the extra particles. When large mixings occur, lepton avor mixings can be quite diierent from quark avor mixings. By taking the string inspired SU (6) SU (2) ...