scholarly journals Constraining the MSSM sfermion mass matrices with light fermion masses

2010 ◽  
Vol 81 (7) ◽  
Author(s):  
Andreas Crivellin ◽  
Jennifer Girrbach
Keyword(s):  
Fermion Masses ◽  
Mass Matrices ◽  
Light Fermion

Texture zero mass matrices and flavor mixing of quarks and leptons

2015 ◽  
Vol 30 (28) ◽  
pp. 1550138 ◽  
Author(s):  
Harald Fritzsch
Keyword(s):  
Experimental Data ◽  
Neutrino Masses ◽  
Mixing Angle ◽  
Mixing Angles ◽  
Zero Mass ◽  
Fermion Masses ◽  
Mass Matrices ◽  
Flavor Mixing ◽  
Texture Zero ◽  
The Masses

We discuss mass matrices with four texture zeros for the quarks and leptons. The three mixing angles for the quarks and leptons are functions of the fermion masses. The results agree with the experimental data. The ratio of the masses of the first two neutrinos is given by the solar mixing angle. The neutrino masses are calculated: [Formula: see text], [Formula: see text] and [Formula: see text].

scholarly journals A NEW ANSATZ FOR QUARK AND LEPTON MASS MATRICES

1992 ◽  
Vol 07 (26) ◽  
pp. 2429-2435 ◽  
Author(s):  
GIAN F. GIUDICE
Keyword(s):  
Vacuum Expectation ◽  
Cabibbo Angle ◽  
Expectation Values ◽  
Higgs Vacuum ◽  
Grand Unified Theories ◽  
Fermion Masses ◽  
Mass Matrices ◽  
Unified Theories ◽  
Free Parameters ◽  
Good Agreement

A new ansatz for quark and lepton mass matrices is proposed in the context of supersymmetric grand unified theories. The 13 parameters describing fermion masses and mixings are determined in terms of only 6 free parameters, allowing 7 testable predictions. The values of Vus, Vcb, Vub, mu, md, ms and mb are then predicted as a function of the 3 charged lepton masses, mc, mt and tan β, the ratio of Higgs vacuum expectation values. In particular the Cabibbo angle and ms/md are determined in terms of only lepton masses. All predictions are in very good agreement with experiments.

scholarly journals FLAVOR VIOLATION IN A MINIMAL SO(10)×A4 SUSY GUT

2012 ◽  
Vol 27 (01) ◽  
pp. 1250005 ◽  
Author(s):  
ABDELHAMID ALBAID
Keyword(s):  
Neutral Current ◽  
Branching Ratio ◽  
Flavor Violation ◽  
Flavor Changing ◽  
Fermion Masses ◽  
Fermion Fields ◽  
Experimental Constraint ◽  
Flavor Changing Neutral Current ◽  
High Degree ◽  
Light Fermion

Flavor violating processes in the quark and lepton sectors are investigated within a realistic supersymmetric SO(10)×A4 grand unification model. By employing exotic heavy fermion fields, this model successfully describes various features of the fermion masses and mixings including large neutrino mixings accompanied by small quark mixings. In this model the flavor violation is induced at GUT scale, at which A4 flavor symmetry is broken, as a consequence of the large mixings of the light fermion fields with these exotic heavy fields. The stringent experimental constraint from μ→eγ decay rate necessitates a high degree of degeneracy of the supersymmetry breaking soft scalar masses of the exotic heavy fields and supersymmetric scalar partners of the light fermion fields. The choice of slepton masses of order 1 TeV is found to be consistent with the constraints from branching ratio of μ→eγ and with all other flavor changing neutral current processes being sufficiently suppressed.

LIGHT FERMION MASSES FROM SU(3)color×U(1)e.m.?

1989 ◽  
Vol 04 (12) ◽  
pp. 1159-1167
Author(s):  
A. DAVIDSON ◽  
B. MARGOLIS ◽  
J. ROBINSON ◽  
P. VALIN
Keyword(s):  
Cp Violation ◽  
Mass Formula ◽  
First Generation ◽  
Complete Model ◽  
Seesaw Mechanism ◽  
Fermion Masses ◽  
Type Mass ◽  
Light Fermion

We consider the hypothesis that (i) mv≃0 because the neutrino is SU (3)c× U (1) e.m. neutral, (ii) m electron = 0 at the isospin limit where mu=md, and (iii) all first-generation fer-mions turn massless as αc, α e.m. →0. This hypothesis is supported by the empirical Abraham-Lorentz-type mass formula m=(ζ1Q+ζ2B)2, whose quadratic structure is attributed to a universal seesaw mechanism. We demonstrate how such a formula can stay exact even when switching on the inter-generational mixings. We present a complete model with the above features which gives quark and lepton masses and the K-M matrix, including CP violation.

scholarly journals Gauge U(1) dark symmetry and radiative light fermion masses

2016 ◽  
Vol 760 ◽  
pp. 59-62 ◽  
Author(s):  
Corey Kownacki ◽  
Ernest Ma
Keyword(s):  
Fermion Masses ◽  
Light Fermion

Constraints from Spectrum of Scalar Fields in the 3-3-1 Model with CKM Mechanism

2019 ◽  
Vol 29 (3SI) ◽  
pp. 357
Author(s):  
Ngoc Long Hoang ◽  
Van Hop Nguyen ◽  
T. Nhuan Nguyen ◽  
Hanh Phuong Hoang
Keyword(s):  
Scalar Fields ◽  
Stability Conditions ◽  
Vacuum Stability ◽  
Fermion Masses ◽  
Condi Tions ◽  
Mass Matrices ◽  
Definition Of

The vacuum stability conditions are implemented for the 3-3-1 model of observed fermion masses and mixings. We show that for the Higgs squared mass matrices, the condi- tions for semi-definition of the diagonal elements are most important since other constraints are followed from the first ones.

NEUTRINO SPECTRUM IN NONSUPERSYMMETRIC SO(10)

1996 ◽  
Vol 11 (36) ◽  
pp. 2837-2848
Author(s):  
GABRIELA BARENBOIM
Keyword(s):  
Higgs Sector ◽  
Fine Tuning ◽  
Hierarchy Problem ◽  
Yukawa Couplings ◽  
Neutrino Spectrum ◽  
Fermion Masses ◽  
Mass Matrices

We present a predictive scheme for fermion masses and mixings inspired by nonsupersymmetric SO(10) in which the hierarchy problem is resolved without fine tuning the Yukawa couplings. This calls for a nonminimal Higgs sector which we exploit in deriving the expressions for the mass matrices. To keep the predictivity of the model under control we limit the structure of the mass matrices by imposing U(1) symmetries. A very predictive neutrino spectrum is then obtained.

E(6) model of light-fermion masses

1982 ◽  
Vol 25 (7) ◽  
pp. 1904-1909
Author(s):  
S. M. Barr
Keyword(s):  
Fermion Masses ◽  
Light Fermion
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