scholarly journals Fermion masses and mixing angles from SU(3) family symmetry and unification

2003 ◽  
Vol 574 (3-4) ◽  
pp. 239-252 ◽  
Author(s):  
S.F. King ◽  
G.G. Ross
Keyword(s):  
Family Symmetry ◽  
Mixing Angles ◽  
Fermion Masses

Nonabelian family symmetry and the origin of fermion masses and mixing angles

1986 ◽  
Vol 179 (1-2) ◽  
pp. 95-102 ◽  
Author(s):  
Mark Soldate ◽  
M.Hall Reno ◽  
Christopher T. Hill
Keyword(s):  
Family Symmetry ◽  
Mixing Angles ◽  
Fermion Masses

scholarly journals Neutrino Masses and SO(10) SUSY GUTs

2001 ◽  
Vol 16 (supp01b) ◽  
pp. 569-575
Author(s):  
Stuart Raby
Keyword(s):  
Solar Neutrino ◽  
Atmospheric Neutrino ◽  
Neutrino Masses ◽  
Family Symmetry ◽  
Mixing Angle ◽  
Mixing Angles ◽  
Charged Fermion ◽  
Fermion Masses ◽  
Global Fit ◽  
Precision Electroweak Data

In this talk I discuss the qualitative features of an SO(10) SUSY GUT with an SU (2)× U (1) n family symmetry. I then describe the global fit of this theory to precision electroweak data [including charged fermion masses and mixing angles]. Finally, the predictions of the model for neutrino masses and mixing are discussed. The most predictive version of the model naturally fits atmospheric neutrino data with maximal νμ→ντ oscillations and solar neutrino data with small mixing angle MSW νe→νsterile oscillations.

scholarly journals Fermion masses and mixing angles from SU(3) family symmetry

2001 ◽  
Vol 520 (3-4) ◽  
pp. 243-253 ◽  
Author(s):  
S.F. King ◽  
G.G. Ross
Keyword(s):  
Family Symmetry ◽  
Mixing Angles ◽  
Fermion Masses

scholarly journals NEW BOUNDS ON THE STRING SCALE FROM FLAVOR PHYSICS

2004 ◽  
Vol 19 (07) ◽  
pp. 497-509 ◽  
Author(s):  
J. SANTIAGO
Keyword(s):  
Lower Bounds ◽  
Flavor Physics ◽  
Scale Up ◽  
Quantum Corrections ◽  
Tree Level ◽  
Mixing Angles ◽  
Realistic Theory ◽  
Flavor Changing ◽  
Fermion Masses ◽  
Supersymmetric Models

We review the very stringent lower bounds on the string scale that arise from flavor considerations in models with intersecting branes. Despite the absence of a realistic flavor structure at tree level, flavor changing interactions induce a non-trivial pattern of fermion masses and mixing angles when quantum corrections are taken into account. The resulting realistic theory of flavor allows us to constrain, in an unambiguous way, the string scale up to levels difficult to reconcile non-supersymmetric models.

scholarly journals A KIND OF PREDICTION FROM STRING PHENOMENOLOGY: EXTRA MATTER AT LOW ENERGY

2007 ◽  
Vol 22 (14) ◽  
pp. 989-1003 ◽  
Author(s):  
CARLOS MUÑOZ
Keyword(s):  
Potential Problem ◽  
Low Energy ◽  
Mixing Angles ◽  
Yukawa Couplings ◽  
Problem Finding ◽  
String Phenomenology ◽  
Fermion Masses ◽  
Interesting Pattern ◽  
Low Energies ◽  
Crucial Ingredient

We review the possibility that the Supersymmetric Standard Model arises from orbifold constructions of the E8×E8 Heterotic Superstring, and the phenomenological properties that such a model should have. In particular, trying to solve the discrepancy between the unification scale predicted by the Heterotic Superstring (≈g GUT × 5.27 × 1017 GeV ) and the value deduced from LEP experiments (≈2 × 1016 GeV ), we will predict the presence at low energies of three families of Higgses and vector-like colour triplets. Our approach relies on the Fayet–Iliopoulos breaking, and this is also a crucial ingredient, together with having three Higgs families, to obtain in these models an interesting pattern of fermion masses and mixing angles at the renormalizable level. Namely, after the gauge breaking some physical particles appear combined with other states, and the Yukawa couplings are modified in a well-controlled way. On the other hand, dangerous flavour-changing neutral currents may appear when fermions of a given charge receive their mass through couplings with several Higgs doublets. We will address this potential problem, finding that viable scenarios can be obtained for a reasonable light Higgs spectrum.

Neutrino masses and mixing angles in a predictive theory of fermion masses

1993 ◽  
Vol 47 (9) ◽  
pp. R3697-R3701 ◽  
Author(s):  
Savas Dimopoulos ◽  
Lawrence J. Hall ◽  
Stuart Raby
Keyword(s):  
Neutrino Masses ◽  
Mixing Angles ◽  
Fermion Masses ◽  
Predictive Theory

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].

Fermion masses and mixing angles: A test for string vacua

1990 ◽  
Vol 332 (1) ◽  
pp. 189-208 ◽  
Author(s):  
J.A. Casas ◽  
C. Muñoz
Keyword(s):  
Mixing Angles ◽  
Fermion Masses

scholarly journals QUARK AND LEPTON MASS MATRICES WITH A4 FAMILY SYMMETRY

2007 ◽  
Vol 16 (05) ◽  
pp. 1383-1393 ◽  
Author(s):  
HIDEYUKI SAWANAKA
Keyword(s):  
Experimental Data ◽  
Neutrino Mixing ◽  
Family Symmetry ◽  
Mixing Angles ◽  
Quark Masses ◽  
Quark Sector ◽  
Mass Matrices ◽  
Mixing Matrix ◽  
Current Experimental Data

Realistic quark masses and mixing angles are obtained applying the successful A4 family symmetry for leptons, motivated by the quark-lepton assignments of SU (5). The A4 symmetry is suitable to give tri-bimaximal neutrino mixing matrix which is consistent with current experimental data. We study new scenario for the quark sector with the A4 symmetry.

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