15,038 research outputs found
SO(10) unification with horizontal symmetry
We extend the nonsupersymmetric SO(10) grand unification theories by adding a
horizontal symmetry, which connects the three generations of fermions. Without
committing to any specific symmetry group, we investigate the 1-loop
renormalization group evolutions of the gauge couplings with one and two
intermediate breaking scales. We find that depending on the SO(10) breaking
chains, gauge coupling unification is compatible with only a handful of choices
of representations of the Higgs bosons under the horizontal symmetry.Comment: 21 pages, 6 tables. v2: Further clarifications added primarily in
Discussions Section, References updated, to be published in PR
Partial Yukawa unification and a supersymmetric origin of flavor mixing
In a large class of supersymmetric SO(10) and left-right models, requiring that the effective theory below the scale of breaking be the MSSM implies partial Yukawa unification with and . The same result also emerges in models with a horizontal symmetry. As a result, at the tree level, these models lead to vanishing quark mixing angles. We show that the correct mixing pattern can be generated in these models at the loop level from the flavor structure associated with the supersymmetry breaking terms. We generalize the constraints on supersymmetric parameters from flavor changing neutral current (FCNC) processes to include several squark mass insertions and confirm the consistency of the scheme. The expectations of this scheme for CP violating observables in the meson system are quiet different from the KM model, so it can be tested at the B factories
The Paths of Unification In The GUST With The G x G Gauge Groups of E(8) x E(8)
In the framework of the four dimensional heterotic superstring with free
fermions we discuss the rank eight and/or sixteen Grand Unified String Theories
(GUST) which contain the SU(3)_H - gauge family symmetry. We explicitly
investigate the paths of the unification in the GUST with gauge symmetry G x G
= [SU(5) x U(1) x (SU(3) x U(1))_H]^2. We show that the GUSTs with the G x G
gauge group allow to make the scale of unification to be consistent with the
string scale M_SU = g_{string} * 5 * 10^17 GeV.Comment: 18 pages, 2 Postscript figures, uses epsf.st
Horizontal symmetry in Higgs sector of GUT with U(1)_A symmetry
In a series of papers, we pointed out that an anomalous gauge
symmetry naturally solves various problems in grand unified theories (GUTs) and
that a horizontal gauge symmetry, or , not only realizes the
unification of three generation quarks and leptons in fewer multiplets but also
solves the supersymmetric flavor problem. In this paper, we examine the
possibility that the Higgs sectors of the GUT symmetry and of the horizontal
symmetry are unified, that is, there are some Higgs fields whose vacuum
expectation values (VEVs) break both the GUT gauge symmetry and the horizontal
symmetry at the same time. Although the scale of the VEVs become too large to
suppress the flavor changing neutral current processes sufficiently, the
unification is possible. In addition, for the models, the
gauge anomaly is cancelled in the unified models without introducing additional
fields in contrast with the previous models in which the Higgs sectors are not
unified.Comment: 35 page
Hierarchical Mass Matrices in a Minimal SO(10) Grand Unification I
We consider a minimal SO(10) unified model with horizontal Peccei-Quinn
symmetry. The hierarchical structure of quark-lepton mass matrices is naturally
implemented by the remnants of certain irrelevant terms. Georgi-Jarlskog
relations are also realized due to the horizontal symmetry.Comment: phyzzx and tables, 15 pages, KUNS 125
Fermion masses and mixings in gauge theories
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.Comment: 25 pages, RevTex, no figures. Few misprints corrected and two
references adde
- …