88 research outputs found
S4 Flavor Model of Quarks and Leptons
We present an flavor model to unify quarks and leptons in the framework
of the SU(5) GUT. Three generations of -plets in SU(5) are assigned
of while the first and the second generations of 10-plets in SU(5)
are assigned to be 2 of , and the third generation of 10-plet is to be
of . Right-handed neutrinos are also assigned 2 for the first and
second generations and for the third generation, respectively. Taking
vacuum alignments of relevant gauge singlet scalars, we predict the quark
mixing as well as the tri-bimaximal mixing of neutrino flavors. Especially, the
Cabbibo angle is predicted to be in the limit of the vacuum
alignment. We can improve the model to predict observed CKM mixing angles.Comment: 11 pages, talked at the 16th Yukawa International Seminar, Particle
Physics beyond the Standard Mode
Like-sign dimuon asymmetry of B0 meson and LFV in SU(5) SUSY GUT with S4 flavor symmetry
The like-sign dimuon charge asymmetry of the meson, which was reported in
the D\O Collaboration, is studied in the SU(5) SUSY GUT model with
flavor symmetry. Additional CP violating effects from the squark sector are
discussed in mixing process. The predicted like-sign charge
asymmetry is in the 2 range of the combined result of D\O and CDF
measurements. Since the SUSY contributions in the quark sector affect to the
lepton sector because of the SU(5) GUT relation, two predictions are given in
the leptonic processes: (i) both and the electron
EDM are close to the present upper bound, (ii) the decay ratios of
decays, and , are related to each other
via the Cabibbo angle : {\rm BR}(\tau \to e\gamma)/{\rm BR}(\tau
\to \mu\gamma)\sime \lambda_c^2. These are testable at future experiments.Comment: 33 pages, 4 figures, a footnote and references are adde
Slepton Mass Matrices, mu -> e gamma Decay and EDM in SUSY S4 Flavor Model
We discuss slepton mass matrices in the flavor model with SUSY SU(5)
GUT. By considering the gravity mediation within the framework of supergravity
theory, we estimate the SUSY breaking terms in the slepton mass matrices, which
contribute to the decay.
We obtain a lower bound for the ratio of as
if and are below 500GeV. The off
diagonal terms of slepton mass matrices also contribute to EDM of leptons. The
predicted electron EDM is around cm. Our predictions are
expected to be tested in the near future experiment.Comment: 26 pages, 10 figure
Tri-bimaximal Mixing and Cabibbo Angle in S4 Flavor Model with SUSY
We present a flavor model of quarks and leptons with the non-Abelian discrete
symmetry in the framework of the SU(5) SUSY GUT. Three generations of
-plets in SU(5) are assigned to of while the first and
second generations of 10-plets in SU(5) are assigned to of , and
the third generation of 10-plet is assigned to of . Right-handed
neutrinos are also assigned to for the first and second generations
and for the third generation. We predict the Cabibbo angle as well
as the tri-bimaximal mixing of neutrino flavors. We also predict the
non-vanishing of the neutrino flavor mixing due to higher dimensional
mass operators. Our predicted CKM mixing angles and the CP violation are
consistent with experimental values. We also study SUSY breaking terms in the
slepton sector. Our model leads to smaller values of flavor changing neutral
currents than the present experimental bounds.Comment: 32 pages, 4 figures, some references are added, with minor
modificatio
Studies on Parathion Poisoning Part 3. Parathion poisonig in Experimental Anemias
In the rabbits with bleeding anemia, the red cell cholinesterase was inhibited following subcutaneous injection of 10 mg/kg parathion as in the cases of normal rabbits, while the recovery of red cell cholinesterase was faster and greater than that of the normal, and moreover, it was estimated to be above the normal value. Changes of serum cholinesterase activity was the same as those of red cell cholinesterase. On the contrary, in the rabbits with anemia induced by repeated injections of bezol, slower recovery of red cell cholinesterase was observed, but the serum cholinesterase activity was similar to that of the control. In both these anemic cases, almost no difference in LD(50) of parathion could be detected
Non-Abelian Discrete Symmetries in Particle Physics
We review pedagogically non-Abelian discrete groups, which play an important
role in the particle physics. We show group-theoretical aspects for many
concrete groups, such as representations, their tensor products. We explain how
to derive, conjugacy classes, characters, representations, and tensor products
for these groups (with a finite number). We discussed them explicitly for
, , , , , , , ,
and , which have been applied for model building
in the particle physics. We also present typical flavor models by using ,
, and groups. Breaking patterns of discrete groups and
decompositions of multiplets are important for applications of the non-Abelian
discrete symmetry. We discuss these breaking patterns of the non-Abelian
discrete group, which are a powerful tool for model buildings. We also review
briefly about anomalies of non-Abelian discrete symmetries by using the path
integral approach.Comment: 179 pages, 8 figures, section 15 is changed, some references are
adde
Quark mixing from Delta(6N^2) family symmetry
We consider a direct approach to quark mixing based on the discrete family
symmetry Delta (6N^2) in which the Cabibbo angle is determined by a residual
Z_2 times Z_2 subgroup to be , for being a multiple of
7. We propose a particular model in which unequal smaller quark mixing angles
and CP phases may occur without breaking the residual Z_2 times Z_2 symmetry.
We perform a numerical analysis of the model for , where small Z_2 times
Z_2 breaking effects of order 3% are allowed by model, allowing perfect
agreement within the uncertainties of the experimentally determined best fit
quark mixing values.Comment: 14 pages, 6 figures. arXiv admin note: text overlap with
arXiv:1403.439
Resonant growth of stellar oscillations by incident gravitational waves
Stellar oscillation under the combined influences of incident gravitational
wave and radiation loss is studied in a simple toy model. The star is
approximated as a uniform density ellipsoid in the Newtonian gravity including
radiation damping through quadrupole formula. The time evolution of the
oscillation is significantly controlled by the incident wave amplitude ,
frequency and damping time . If a combination
exceeds a threshold value, which depends on the resonance mode, the resonant
growth is realized.Comment: 11 pages, 6 figures, Accepted for the publication in Classical and
Quantum Gravit
Neutrino masses and mixing from S4 flavor twisting
We discuss a neutrino mass model based on the S4 discrete symmetry where the
symmetry breaking is triggered by the boundary conditions of the bulk
right-handed neutrino in the fifth spacial dimension. While the symmetry
restricts bare mass parameters to flavor-diagonal forms, the viable mixing
angles emerge from the wave functions of the Kaluza-Klein modes which carry
symmetry breaking effect. The magnitudes of the lepton mixing angles,
especially the reactor angle is related to the neutrino mass patterns and the
model will be tested in future neutrino experiments, e.g., an early (late)
discovery of the reactor angle favors the normal (inverted) hierarchy. The size
of extra dimension has a connection to the possible mass spectrum; a small
(large) volume corresponds to the normal (inverted) mass hierarchy.Comment: 22 pages, 3 figures; added references for section
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