59 research outputs found
Leptogenesis in a perturbative SO(10) model
We consider a phenomenologically viable SO(10) grand unification model which
allows perturbative calculations up to the Planck scale or the string scale. We
use a set of Higgs superfields {10 + 16bar + 16 + 45}. In this framework, the
data fitting of the charged fermion mass matrices is re-examined. This model
can indeed reproduce the low-energy experimental data relating the charged
fermion masses and mixings. As for the neutrino sector, we take the neutrino
oscillation data as input data to construct right-handed Majorana neutrino mass
matrix and get a prediction for the physics related to the right-handed
neutrinos, e.g. the leptogenesis and for the proton decay. We propose two kinds
of phenomenologically viable model, quoted as Model 1 and Model 2. We show that
one of the models (Model 2) is consistent with all experimental constraints.Comment: 24 pages, 1 table, 8 figures; the version to appear in JHE
Renormalization Group Equation of Quark-Lepton Mass Matrices in the SO(10) Model with Two Higgs Scalars
The renormalization group equations (RGEs) of the mass matrices of quarks and
leptons in a SO(10) model with two Higgs scalars in the Yukawa coupling are
studied. This model is the minimal model of SUSY and non-SUSY SO(10) GUT which
can reproduce all the experimental data. Non-SUSY SO(10) GUT model has the
intermediate energy phase, Pati-Salam phase, and passes through the symmetry
breaking pattern, . Though minimal, it has, after the Pati-Salam
phase, four Higgs doublets in Yukawa interactions. We consider the RGE's of the
Yukawa coupling constants of quarks and charged leptons and of the coupling
constants of the dimension five operators of neutrinos corresponding to the
above symmetry breaking pattern. The scalar quartic interactions are also
incorporated.Comment: 16 pages, 1 figure; A discussion of scalar self couplings
contributions to the RGE of neutrino mass matrix and some references added, a
figure replace
Renormalizable minimal SO(10) GUT in 4D and 5D
This report is a review of the present status of GUT, especially
renormalizable minimal SO(10) GUT, and its future prospect.
It consists of two parts. In part I, I review how the minimal renormalizable
supersymmetric SO(10) GUT, an SO(10) framework with only one and one
Higgs multiplets in the Yukawa sector, is attractive because of
its high predictivity. Indeed it not only gave a consistent predictions on
neutrino oscillation data but also did reasonable and interesting values for
Leptogenesis, LFV, muon g-2, neutrinoless double beta decay etc. However, this
model suffers from problems, apart from the small deviations from the observed
values, related to running of gauge couplings and proton decay. The gauge
coupling unification may be spoiled due to the presence of intermediate scales
much lighter than the grand unification (GUT) scale. In addition, the gauge
couplings blow up around the GUT scale because of the presence of Higgs
multiplets of large representations. In order to remedy these pathologies, in
part II, we extend GUT into 5D. We propose two approaches: one is to consider
the warped extra dimension, using the bulk Higgs profile to explain the
intermediate energy scales. Another is to use the orbifold GUT. Both approaches
are complementary to each other.Comment: A talk in the workshop on GUT held at Ritsumeikan Univ. on Dec.17-19
200
Looking up at seesaw and GUT scales from TeV
In this talk, I discuss how we may approach physics at the seesaw- and
GUT-scales using data from the TeV scale. Even though we cannot hope to
directly reach these energy scales using particle accelerators, we may get
convinced of grand unification and seesaw mechanism based on experimental data
if Nature is kind to us. In addition, we may find compelling reason to believe
in leptogenesis based on experimental data. This cannot be achieved by a single
experiment, but rather a collection of them, based on LHC, ILC, neutrino
oscillation, neutrinoless double beta decay, direct dark matter detection, CMB
power spectrum and its tensor mode.Comment: Proceedings of "Grand Unified Theories: Current Status and Future
Prospects: An International Workshop", Kusatsu, Shiga, Japan, 17-19 December
200
SO(10) Group Theory for the Unified Model Building
The complete tables of Clebsh-Gordan (CG) coefficients for a wide class of
SO(10) SUSY grand unified theories (GUTs) are given. Explicit expression of all
states and corresponding multiplets under standard model gauge group G_{321} =
SU(3)_C x SU(2)_L x U(1)_Y, necessary for evaluation of the CG coefficients are
presented. The SUSY SO(10) GUT model considered here incudes most of the Higgs
irreducible representations usually used in the literature: 10, 45, 54, 120,
126 126-bar and 210. Mass matrices of all G_{321} multiplets are found for the
most general superpotential. These results are indispensible for the precision
calculations of the gauge coupling unification and proton decay, etc.Comment: 62 pages, LaTeX, we comment on results of hep-ph/0402122 and
hep-ph/0405074; typos corrected;references updated, small improvements of the
tex
Towards A Realistic Grand Gauge-Higgs Unification Scenario
In this talk, we discuss an attempt to construct a realistic model of the
grand gauge-Higgs unification. We investigate a 5D SU(6) grand gauge-Higgs
unification model compactified on an orbifold S^1/Z_2. Ordinary quarks and
leptons, together with right-handed neutrinos, are just accommodated into a
minimal set of representations of the gauge group, without introducing any
exotic states in the same representations. The proton decay turns out to be
forbidden at least at the tree level. We also find a correct electroweak
symmetry breaking SU(2)_L \times U(1)_Y \to U(1)_{em} is easily realized by
introducing suitable number of adjoint fermions.Comment: 11 pages, 5 eps figures, To appear in the proceeding of International
Workshop on Grand Unified Theories: Current Status and Future Prospects
(GUT07), December 17-19 2007, Kusatsu, Japa
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