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 -
نویسندگان
چکیده
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 family unification " model based on E7/SU(5)×U(1) 3. This model also suggests the small angle MSW solution to the solar neutrino problem.
منابع مشابه
ar X iv : h ep - p h / 04 05 27 2 v 1 2 7 M ay 2 00 4 hep - ph / 0405272 Sequential Dominance
We review the mechanism of sequential right-handed neutrino dominance proposed in the framework of the type I seesaw mechanism to account for bi-large neutrino mixing and a neutrino mass hierarchy in a natural way. We discuss how sequential dominance may also be applied to the right-handed charged leptons, which alternatively allows bi-large lepton mixing from the charged lepton sector. We revi...
متن کاملar X iv : h ep - p h / 02 04 09 8 v 1 9 A pr 2 00 2 GUT GENEALOGIES FOR SUSY SEESAW HIGGS
We discuss the embedding of R-Parity preserving Minimal Left Right Supersym-metric models into Pati-Salam and SO(10) GUTs.
متن کاملar X iv : h ep - p h / 98 12 39 9 v 1 1 6 D ec 1 99 8 1 The Tau Lepton : Particle Physics in a Nutshell
τ decays 5. Beyond the Standard Model 5.1 CP violation in hadronic τ decays 5.2 " Forbidden " decays.
متن کاملar X iv : h ep - p h / 98 10 32 6 v 1 1 2 O ct 1 99 8 Low tan β in the extended Minimal Gauge Mediated Model ∗
We consider the Minimal Gauge Mediated Model (MGMM) with either fundamental or antisymmetric messenger multiplets and study consequences of messenger-matter mixing. It is shown that constraints on relevant coupling constants and mixing parameters coming from the existing experimental limits on lepton flavor violation and FCNC processes allow a wide range of tan β in MGMM with mixing.
متن کاملar X iv : h ep - p h / 98 07 31 0 v 1 9 J ul 1 99 8 Neutrino mixing and seesaw mechanism
Models of neutrino masses are discussed capable of explaining in a natural way the maximal mixing between ν µ and ν τ observed by the Super-Kamiokande collaboration. For three generations of leptons two classes of such models are found implying: a) ∆m 23 2 ≪ ∆m 12 2 ≈ ∆m 13 2 and a small mixing between ν e and the other two neutrinos, b) ∆m 12 2 ≪ ∆m 13 2 ≈ ∆m 23 2 and a nearly maximal mixing f...
متن کامل