scholarly journals Intermediate left-right gauge symmetry, unification of couplings, and fermion masses in supersymmetricSO(10)×S4

2008 ◽  
Vol 78 (5) ◽  
Author(s):  
M. K. Parida
Keyword(s):  
Gauge Symmetry ◽  
Fermion Masses

scholarly journals CHARGES AND MASS SPECTRUM IN THE PISANO–PLEITEZ–FRAMPTON 3-3-1 GAUGE MODEL

2008 ◽  
Vol 23 (14) ◽  
pp. 1011-1030 ◽  
Author(s):  
ION I. COTĂESCU ◽  
ADRIAN PALCU
Keyword(s):  
Mass Spectrum ◽  
Gauge Symmetry ◽  
Standard Model ◽  
Neutrino Mass ◽  
Higgs Mechanism ◽  
Gauge Model ◽  
Gauge Models ◽  
Fermion Masses ◽  
Mass Pattern ◽  
General Method

The Pisano–Pleitez–Frampton 3-3-1 model is revisited here within the framework of the general method for solving gauge models with high symmetries. This exact algebraical approach — proposed several years ago by one of us — was designed to include a minimal Higgs mechanism that spontaneously breaks the gauge symmetry up to the universal U(1)em electromagnetic one and, consequently, to supply the mass spectrum and the couplings of the currents for all the particles in the model. We prove in this paper that this powerful tool, when is applied to the PPF 3-3-1 model, naturally recovers the whole Standard Model phenomenology and, in addition, predicts — since a proper parametrization is employed — viable results such as: (i) the exact expressions for the boson and fermion masses, (ii) the couplings of the charged and neutral currents and (iii) a plausible neutrino mass pattern. A generalized Weinberg transformation is implemented, while the mixing between the neutral bosons Z and Z′ is performed as a necessary step by the method itself. Some phenomenological consequences are also sketched, including the strange possibility that simultaneously m(Z) = m(Z′) and m(W) = m(V) hold.

scholarly journals Supersymmetric U(1)Y′⊗ U(1)B−L extension of the Standard Model

2017 ◽  
Vol 32 (16) ◽  
pp. 1750093 ◽  
Author(s):  
J. C. Montero ◽  
V. Pleitez ◽  
B. L. Sánchez-Vega ◽  
M. C. Rodriguez
Keyword(s):  
Gauge Symmetry ◽  
Mass Spectra ◽  
Tree Level ◽  
Neutrino Masses ◽  
Type I ◽  
Seesaw Mechanism ◽  
Active Neutrino ◽  
Supersymmetric Version ◽  
Fermion Masses ◽  
The Standard Model

We build a supersymmetric version with [Formula: see text] gauge symmetry, where [Formula: see text] is a new charge and [Formula: see text] and [Formula: see text] are the usual baryonic and leptonic numbers. The model has three right-handed neutrinos with identical [Formula: see text] charges, and can accommodate all fermion masses at the tree level. In particular, the type I seesaw mechanism is implemented for the generation of the active neutrino masses. We obtain the mass spectra of all sectors and for the scalar one we also give the flat directions allowed by the model.

Neutrino mass and mixing in the 3-3-1 model with neutral leptons based on D4flavor symmetry

2014 ◽  
Vol 29 (23) ◽  
pp. 1450122 ◽  
Author(s):  
V. V. Vien
Keyword(s):  
Gauge Symmetry ◽  
Beta Decay ◽  
Neutrino Mass ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Neutrino Masses ◽  
Neutrino Mass And Mixing ◽  
Fermion Masses ◽  
Fermion Fields ◽  
Mixing Matrix

We propose a new D4flavor model based on SU (3)C⊗ SU (3)L⊗ U (1)Xgauge symmetry responsible for fermion masses and mixings in which all fermion fields act only as singlets under D4which differs from our previous work. The neutrinos get small masses from two SU (3)Lanti-sextets and one SU (3)Ltriplet which are all in singlets under D4. If a SU (3)LHiggs triplet, lying in [Formula: see text] under D4, is considered as a perturbation the corresponding neutrino mass mixing matrix gets the most general form. In this case, the model can fit the most recent data on neutrino masses and mixing with nonzero θ13. Our results show that the neutrino masses are naturally small. The sum of three light neutrino masses and the effective mass governing neutrinoless double beta decay are obtained that are consistent with the recent data.

GSW model of electroweak interactions

2018 ◽  
Author(s):  
Michael Kachelriess
Keyword(s):  
Gauge Symmetry ◽  
Higgs Sector ◽  
Electroweak Interactions ◽  
Hierarchy Problem ◽  
Fermion Masses ◽  
Electroweak Sector ◽  
Higgs Effect

The electroweak sector of the SM described by an SUL(2)UY(1) gauge symmetry which is broken spontaneously to Uem(1) is introduced. The generation of boson and fermion masses by the Higgs effect is discussed. The properties of the Higgs sector are examined. The conditions for decoupling and the hierarchy problem are discussed.

scholarly journals FERMION MASSES AND MIXINGS IN GAUGE THEORIES

2002 ◽  
Vol 17 (28) ◽  
pp. 3981-4006 ◽  
Author(s):  
D. FALCONE
Keyword(s):  
Gauge Symmetry ◽  
Standard Model ◽  
Neutrino Mass ◽  
Quark Mass ◽  
Gauge Theories ◽  
Neutrino Oscillations ◽  
Heavy Neutrino ◽  
Fermion Masses ◽  
Mass Matrices ◽  
The Standard Model

The recent evidence for neutrino oscillations stimulate us to discuss again the problem of fermion masses and mixings in gauge theories. In the standard model, several forms for quark mass matrices are equivalent. They become ansatze within most extensions of the standard model, where also relations between quark and lepton sectors may hold. In a seesaw framework, these relations can constrain the scale of heavy neutrino mass, which is often related to the scale of intermediate or unification gauge symmetry. As a consequence, two main scenarios arise. Hierarchies of masses and mixings may be explained by broken horizontal symmetries.

scholarly journals FLUX PARAMETER SPACES IN TYPE II VACUA

2009 ◽  
Vol 24 (13) ◽  
pp. 2453-2480
Author(s):  
CHING-MING CHEN ◽  
TIANJUN LI ◽  
DIMITRI V. NANOPOULOS
Keyword(s):  
Gauge Symmetry ◽  
Standard Model ◽  
Complex Structure ◽  
Gauge Coupling ◽  
Parameter Spaces ◽  
Exotic Particles ◽  
The Real ◽  
Fermion Masses ◽  
Flux Limit ◽  
Flux Parameter

We study the flux parameter spaces for semirealistic supersymmetric Pati–Salam models in the AdS vacua on Type IIA orientifold and realistic supersymmetric Pati–Salam models in the Minkowski vacua on Type IIB orientifold. Because the fluxes can be very large, we show explicitly that there indeed exists a huge number of semirealistic Type IIA and realistic Type IIB flux models. In the Type IIA flux models, in the very large flux limit, the theory can become weakly coupled and the AdS vacua can approach to the Minkowski vacua. In a series of realistic Type IIB flux models, at the string scale, the gauge symmetry can be broken down to the Standard Model gauge symmetry, the gauge coupling unification can be achieved naturally, all the extra chiral exotic particles can be decoupled, and the observed Standard Model fermion masses and mixings can be obtained as well. In particular, the real parts of the dilaton, Kähler moduli, and the unified gauge coupling are independent of the very large fluxes. The very large fluxes only affect the real and/or imaginary parts of the complex structure moduli, and/or the imaginary parts of the dilaton and Kähler moduli. However, these semirealistic Type IIA and realistic Type IIB flux models cannot be populated in the string landscape.

SEE-SAW MASSES FOR QUARKS AND LEPTONS IN AN AMBIDEXTROUS ELECTROWEAK INTERACTION MODEL

1987 ◽  
Vol 02 (05) ◽  
pp. 307-315 ◽  
Author(s):  
S. RAJPOOT
Keyword(s):  
Gauge Symmetry ◽  
Neutral Current ◽  
Electroweak Interaction ◽  
Interaction Model ◽  
Fermion Masses ◽  
The Masses

An ambidextrous electroweak interaction model with SU (2)L× SU (2)R× U (1) gauge symmetry is described in which the conventional quarks and leptons are accompanied by a set of new fermions that transform as singlets of SU (2)L× SU (2)R. The model has only two doublets of Higgs scalars. The masses of all known quarks and leptons result from the see-saw mechanism between the conventional fermions and the new “singlet” fermions. Neutrino neutral current interactions are identical to those of the standard SU (2)L× U (1) model. The singlet fermion masses lie in the 100-GeV to 1-TeV range to be probed by the oncoming accelerators of the 1990’s.

V A Fock and gauge symmetry

2010 ◽  
Vol 180 (8) ◽  
pp. 871 ◽  
Author(s):  
Lev B. Okun
Keyword(s):  
Gauge Symmetry
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