Quark and Lepton Flavor Mixings in the SU(5) Grand Unification Theory
نویسنده
چکیده
We explain the imbalance of the flavor mixing angles between the quark and the lepton sectors in the context of the SU(5) GUT with the see-saw mechanism. The quark masses and the CKM matrix elements are obtained by using, respectively, the Fritzsch and Branco−Silva-Marcos form for the upand down-quark Yukawa matrices (yu and yd) at the GUT scale. The charged-lepton Yukawa matrix (ye) is the transpose of yd, modified by the Georgi-Jarlskog factor. We show that the neutrino masses and mixing angles suggested by the recent solar and atmospheric neutrinos are then obtained from a simple texture of the neutrino Yukawa matrix (y) and a diagonal right-handed Majorana mass matrix at the GUT scale. PACS: 14.60.Pq, 12.10.Kt, 12.15.Ff.
منابع مشابه
Doubly Lopsided Mass Matrices from Unitary Unification
It is shown that the stratified or “doubly lopsided” mass matrix structure that is known to reproduce well the qualitative features of the quark and lepton masses and mixings can arise quite naturally in the context of grand unification based on the groups SU(N) with N > 5. An SU(8) example is constructed with the minimal anomalyfree, three-family set of fermions, in which a realistic flavor st...
متن کاملLepton flavor violation as a probe of squark mixing in supersymmetric SU(5)
We study flavor violation in a supersymmetric SU(5) grand unification scenario in a model-independent way employing mass insertions. We examine how the quark and the lepton sector observables restrict sfermion mixings. In many cases, a lepton flavor violating process provides a stringent constraint on the flavor structure of right-handed down-type squarks. In particular, μ → eγ turns out to be ...
متن کاملLarge 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...
متن کاملsol = π / 4 from flavor physics - a new evidence for grand unification ?
We argue that there exists simple relation between the quark and lepton mixings which supports the idea of grand unification and probes the underlying robust bimaximal fermion mixing structure of still unknown flavor physics. In this framework the quark mixing matrix is a parameter matrix describing the deviation of neutrino mixing from exactly bi-maximal, predicting θsol+θC = π/4, where θC is ...
متن کاملDicyclic horizontal symmetry and supersymmetric grand unification.
It is shown how to use as horizontal symmetry the dicyclic group Q 6 ⊂ SU (2) in a supersymmetric unification SU (5)⊗SU (5)⊗SU (2) where one SU (5) acts on the first and second families, in a horizontal doublet, and the other acts on the third. This can lead to acceptable quark masses and mixings, with an economic choice of matter supermultiplets, and charged lepton masses can be accommodated.
متن کامل