Neutrino masses , anomalous U ( 1 ) gauge symmetry and doublet - triplet splitting
نویسنده
چکیده
We propose an attractive scenario of grand unified theories in which doublet-triplet splitting is beautifully realized in SO(10) unification using Dimopoulos-Wilczek mechanism. The anomalous U(1)A gauge symmetry plays essential roles in the doublet-triplet splitting mechanism. It is interesting that the anomalous U(1)A charges determine the unification scale and mass spectrum of additional particles as well as the order of Yukawa couplings of quarks and leptons. For the neutrino sector, bi-maximal mixing angles are naturally obtained and proton decay via dimension 5 operators is suppressed. It is suggestive that the anomalous U(1)A gauge symmetry motivated by superstring theory excellently solves the two biggest problems in grand unified theories, fermion mass hierarchy problem and doublet-triplet splitting problem. e-mail: [email protected]
منابع مشابه
Grand Unification with Anomalous U(1) Symmetry
In this talk, we introduce a new scenario of grand unified theory (GUT) with anomalous U(1)A gauge symmetry. Since generic interactions (including non-renormalizable interactions) are introduced, once we fix the symmetry of the theory, we can define the theory without O(1) coefficients. The number of parameters to determine the symmetry is just 11 or 12 integer parameters which are anomalous U(...
متن کاملar X iv : h ep - p h / 02 11 03 4 v 1 4 N ov 2
In this talk, we introduce a new scenario of grand unified theory (GUT) with anomalous U(1)A gauge symmetry. Since generic interactions (including non-renormalizable interactions) are introduced, once we fix the symmetry of the theory, we can define the theory without O(1) coefficients. The number of parameters to determine the symmetry is just 11 or 12 integer parameters which are anomalous U(...
متن کاملSUSY SU(6) GIFT for Doublet-Triplet Splitting and Fermion Masses
The supersymmetric SU(6) model equipped by the flavour-blind discrete gauge symmetry Z3 is considered. It provides simultaneous solution to the doublet-triplet splitting problem, μ-problem and leads to natural understanding of fermion flavour. The Higgs doublets arise as Goldstone modes of the spontaneously broken accidental global SU(6) × U(6) symmetry of the Higgs superpotential. Their coupli...
متن کاملE6 Unification, Doublet-Triplet Splitting and Anomalous U(1)A Symmetry
We propose a natural Higgs sector in E6 grand unified theory (GUT) with anomalous U(1)A gauge symmetry. In the scenario, the doublettriplet splitting can be realized while the proton decay via dimension 5 operator is suppressed. The gauge coupling unification is also realized without finetuning. The GUT scale is generally lower than the usual GUT scale 2×1016 GeV, the proton decay via dimension...
متن کاملThe GUT ? Neutrino bi - large mixing and proton decay 1
In this talk, we introduce a new scenario of grand unified theory (GUT) with anomalous U(1)A gauge symmetry, which can explain doublet-triplet splitting, quark and lepton masses and mixing angles. In neutrino sector, the scenario realizes LMA solution for solar neutrino problem and large Ue3 = O(0.1). Moreover, the scenario predicts that the main decay mode of proton is from dimension 6 operato...
متن کامل