scholarly journals Predictive fermion mass matrixAnsätzein nonsupersymmetric SO(10) grand unification

1994 ◽  
Vol 50 (5) ◽  
pp. 3513-3528 ◽  
Author(s):  
N. G. Deshpande ◽  
E. Keith
Keyword(s):  
Grand Unification ◽  
Fermion Mass

scholarly journals A simple grand unification view of neutrino mixing and fermion mass matrices

1999 ◽  
Vol 451 (3-4) ◽  
pp. 388-396 ◽  
Author(s):  
Guido Altarelli ◽  
Ferruccio Feruglio
Keyword(s):  
Grand Unification ◽  
Fermion Mass ◽  
Neutrino Mixing ◽  
Mass Matrices

Symmetry-breaking mass scales and fermion mass relations in SU(8) grand unification

1982 ◽  
Vol 26 (11) ◽  
pp. 3195-3211 ◽  
Author(s):  
F. Bordi ◽  
R. Holman ◽  
C. W. Kim
Keyword(s):  
Symmetry Breaking ◽  
Grand Unification ◽  
Fermion Mass

scholarly journals APPROXIMATE FLAVOR SYMMETRIES AT A GRAND UNIFICATION SCALE

1996 ◽  
Vol 11 (12) ◽  
pp. 965-971
Author(s):  
D. GÓMEZ DUMM
Keyword(s):  
Standard Model ◽  
Higgs Doublet ◽  
Grand Unification ◽  
Fermion Mass ◽  
Flavor Symmetries ◽  
Mass Matrices ◽  
The Standard Model ◽  
The Hierarchical Structure ◽  
Doublet Model ◽  
Two Higgs Doublet Model

We study the evolution of fermion mass matrices considering the hypothesis of approximate flavor symmetries (AFS) in the standard model and a two-Higgs-doublet model. We find that the hierarchical structure is not significantly altered by the running, hence the assumption of AFS is entirely compatible with a grand unification scenario.

scholarly journals GRAND UNIFICATION AS A BRIDGE BETWEEN STRING THEORY AND PHENOMENOLOGY

2006 ◽  
Vol 15 (10) ◽  
pp. 1677-1697 ◽  
Author(s):  
JOGESH C. PATI
Keyword(s):  
String Theory ◽  
Standard Model ◽  
Empirical Evidence ◽  
Grand Unification ◽  
Fermion Mass ◽  
The Standard Model ◽  
Gut Scale ◽  
Predictive Theory ◽  
M Theory ◽  
Flavor Violations

In the first part of this paper, we explain what empirical evidence points to the need for having an effective grand unification-like symmetry possessing the symmetry SU(4)-color in 4D. If one assumes the premises of a future predictive theory including gravity — be it string/M-theory or a reincarnation — this evidence then suggests that such a theory should lead to an effective grand unification-like symmetry as above in 4D, near the string-GUT-scale, rather than the standard model symmetry. Advantages of an effective supersymmetric G (224) = SU (2) L × SU (2) R × SU (4)c or SO(10) symmetry in 4D in explaining (i) observed neutrino oscillations, (ii) baryogenesis via leptogenesis, and (iii) certain fermion mass-relations are noted. And certain distinguishing tests of a SUSY G(224) or SO(10)-framework involving CP and flavor violations (as in μ → eγ, τ → μγ, edm's of the neutron and the electron) as well as proton decay are briefly mentioned. Recalling some of the successes we have had in our understanding of nature so far, and the current difficulties of string/M-theory as regards the large multiplicity of string vacua, some comments are made on the traditional goal of understanding vis a vis the recently evolved view of landscape and anthropism.

Anti-grand unification and the fermion mass problem

1994 ◽  
Vol 414 (3) ◽  
pp. 579-593 ◽  
Author(s):  
C.D. Froggatt ◽  
G. Lowe ◽  
H.B. Nielsen
Keyword(s):  
Grand Unification ◽  
Fermion Mass ◽  
Mass Problem

scholarly journals Electroweak SU(2)L × U(1)Y model with strong spontaneously fermion-mass-generating gauge dynamics

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Petr Beneš ◽  
Jiří Hošek ◽  
Adam Smetana
Keyword(s):  
Chiral Symmetry Breaking ◽  
Axial Vector ◽  
Higgs Sector ◽  
Dyson Equation ◽  
Mass Splitting ◽  
Fermion Mass ◽  
Goldstone Bosons ◽  
The Standard Model ◽  
Exploratory Stage ◽  
The Masses

Abstract Higgs sector of the Standard model (SM) is replaced by quantum flavor dynamics (QFD), the gauged flavor SU(3)f symmetry with scale Λ. Anomaly freedom requires addition of three νR. The approximate QFD Schwinger-Dyson equation for the Euclidean infrared fermion self-energies Σf(p2) has the spontaneous-chiral-symmetry-breaking solutions ideal for seesaw: (1) Σf(p2) = $$ {M}_{fR}^2/p $$ M fR 2 / p where three Majorana masses MfR of νfR are of order Λ. (2) Σf(p2) = $$ {m}_f^2/p $$ m f 2 / p where three Dirac masses mf = m(0)1 + m(3)λ3 + m(8)λ8 of SM fermions are exponentially suppressed w.r.t. Λ, and degenerate for all SM fermions in f. (1) MfR break SU(3)f symmetry completely; m(3), m(8) superimpose the tiny breaking to U(1) × U(1). All flavor gluons thus acquire self-consistently the masses ∼ Λ. (2) All mf break the electroweak SU(2)L × U(1)Y to U(1)em. Symmetry partners of the composite Nambu-Goldstone bosons are the genuine Higgs particles: (1) three νR-composed Higgses χi with masses ∼ Λ. (2) Two new SM-fermion-composed Higgses h3, h8 with masses ∼ m(3), m(8), respectively. (3) The SM-like SM-fermion-composed Higgs h with mass ∼ m(0), the effective Fermi scale. Σf(p2)-dependent vertices in the electroweak Ward-Takahashi identities imply: the axial-vector ones give rise to the W and Z masses at Fermi scale. The polar-vector ones give rise to the fermion mass splitting in f. At the present exploratory stage the splitting comes out unrealistic.

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