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(9) OU-HET-673/2010, MISC-2010-05, TU-871
arXiv:1007.4739 [hep-ph]: July 28, 2010
Revised version of Preprint (5), 2010
Physics Letters B, Vol.695, pp.279-284 (2011)
DOI:10.1016.j.physletb.2010.11.048
Tests of a Family Gauge Symmetry Model at 10^3 TeV Scale
Yoshio Koide, Yukinari Sumino and Masato Yamanaka
Based on a specific model
with U(3) family gauge symmetry at $10^3$ TeV scale,
we show its experimental signatures to search for.
Since the gauge symmetry is introduced with a special purpose,
its gauge coupling constant and gauge boson mass spectrum
are not free.
The current structure in this model leads to family number
violations via exchange of extra gauge bosons.
We investigate present constraints from flavor changing
processes and discuss
visible signatures at LHC and lepton colliders.
arXiv:1011.1312 [hep-ph]: November 8, 2010
Physical Review D 83, 035010-1 -- 8
DOI:10.1103/PhysRevD.83.035010
Unified description of quark and lepton mixing matrices
based on a yukawaon model
Hiroyuki Nishiura and Yoshio Koide
Based on a supersymmetric yukawaon model with O(3) family symmetry,
possible forms of quark and lepton mixing matrices are systematically
investigated under a condition that the up-quark mass matrix form leads to
the observed nearly tribimaximal mixing in the lepton sector.
Although the previous model could not provide a good fitting of
the observed quark mixing, the present model can give a reasonably good fitting
not for lepton mixing but also the quark mixing
by using a different origin of the CP violation from one in the previous model.
arXiv:1011.1064 [hep-ph]: November 5, 2010
Title was changed: For revised version,
see (1) in 2011.
Neutrino Mass Matrix Speculated from Sumino's U(3)times O(3) Family Symmetries
A model with U(3)$\times$O(3) family symmetries,
which has been recently proposed by Sumino in order
to solve a problem as to a charged lepton mass formula,
is not anomaly free. It is pointed out that the
model can be anomaly free by considering a SUSY
version of the Sumino model. Then, the model
suggests an interesting neutrino mass matrix form,
which predicts a nearly tribimaximal mixing without
assuming any discrete symmetry for the neutrino sector.
arXiv:1009.4254 [hep-ph]: September 22, 2010
Invited talk given at The 1st Workshop on
Intensity Frontier of Muon Fundamental Science,
KEK, June 10-11, 2010
To appear in the proceedings, Journal of Physics. Conference Series
New U(3) Family Gauge Symmetry and Muonium into Antimuonium Conversion
According to Sumino's idea, a family U(3) gauge symmetry is assumed.
SU(2)_L doublet fields q_L and \ell_L are
assigned to {\bf 3} of U(3), while singlets
u_R, d_R, e_R and \nu_R are assigned to {\bf 3^*} of U(3).
Then, current-current interactions with flavor number
violations of |\Delta N_{f}|=2 (N_{f} is an individual family number)
appear via the family gauge boson exchanges.
Since the gauge symmetry model has inevitably been
brought by Sumino with a specific purpose,
the gauge coupling constants g_f and the gauge boson mass
spectrum m_{fij}\equiv m(A_i^j) are not free parameters.
We estimate m_{f11} \sim 10^{0-1} TeV and m_{f12} \sim 10^{1-2} TeV.
As a possible signature of such the flavor number violating interactions,
muonium into antimuonium conversion is discussed together with a rare kaon
decay K^+ \rightarrow \pi^+ + \mu^- +e^+.
(5) OU-HET-673/2010, MISC-2010-05, TU-871
arXiv:1007.4739 [hep-ph]: July 28, 2010
For a revised version, see Preprint (9), 2010
Tests of New Family Gauge Symmetry
Yoshio Koide, Yukinari Sumino and Masato Yamanaka
We explore the structure of a new family gauge symmetry U(3)
and show its experimental signatures to search for.
U(3) gauge bosons obviate an unwelcome deviation
of the charged lepton mass formula with the running masses from
that with the pole masses.
The current structure of this model leads to flavor number violations
via exchange of extra gauge bosons. We obtain bounds on the masses
of the gauge bosons from rare kaon decay searches and
muonium-antimuonium oscillation searches. We propose attractive
signatures at LHC and lepton colliders and discuss feasibility of their
discovery.
arXiv:1004.0580 [hep-ph]: April 5, 2010
Physical Review D 81, 097901 (2010).
DOI:10.1103/PhysRevD.81.097901
Charged Lepton Mass Spectrum and a Scalar Potential Model
Stimulated by a recent work by Sumino, on the basis of
a model in which effective Yukawa coupling constants
are described by vacuum expectation values of a scalar
\Phi with $3\times 3$ components, a possible form of
the scalar potential
V(\Phi) which can well describe the observed charged
lepton mass spectrum is investigated without
referring to a specific flavor symmetry model.
A general relation among eigenvalues of
\langle \Phi\rangle is derived without referring to
an explicit form of V(\Phi).
arXiv:1003.5723 [hep-ph]: March 30, 2010
Talk given at the CTP international conference on Neutrino Physics
in the LHC Era, 15-19 Nov. 2009, Luxor, Egypt.
To appear in the proceedings of the American Institute of Physics
Quark Mass Matrix Model for Neutrino Mixing
For the purpose of deriving the
observed nearly tribimaximal neutrino mixing, a possible
quark mass matrix model is investigated based on a
supersymmetric yukawaon model, where a neutrino mass matrix
has been related to the up-quark mass. Therefore,
a quark mass matrix model is proposed in this paper.
As a result, quark and lepton mixing matrices and quark
mass ratios are described by quite few parameters, e.g.
five observable quantities (two up-quark mass ratios and three
neutrino mixing parameters) are excellently fitted by
two parameters and the CKM mixing parameters and down-quark
mass ratios are given under the other two parameters.
arXiv:1001.4877 [hep-ph]: January 27, 2010
Physics Letters B 687, 219-224 (2010)
DOI:10.1016.j.physletb.2010.03.019
Yukawaon Approach to the Sumino Relation for Charged Lepton Masses
On the basis of a supersymmetric yukawaon model,
Sumino's relation for charged lepton masses is re-derived.
A relation between values of
K(\mu) \equiv (m_e +m_\mu + m_\tau)/(\sqrt{m_e} + \sqrt{m_\mu}
+ \sqrt{m_\tau})^2 and \kappa(\mu) \equiv \sqrt{m_e m_\mu m_\tau}/
(\sqrt{m_e} + \sqrt{m_\mu}+ \sqrt{m_\tau})^3 is investigated
without using the relation K=2/3.
Predicted value of \kappa(\mu) is compared with the
observed value of \kappa(\mu), and it is concluded that
the value \xi(\mu)\equiv (3/2)K(\mu) -1 is of the order of
10^{-3} or less.
arXiv:1001.2075 [hep-ph]: January 13, 2010
To appear in the Proceedings of Lepton-Photon 2009
Yukawaon model and unified description of quark and lepton mass matrices
In the so-called yukawaon model, where effective
Yukawa coupling constants Y_f^{eff} (f=e,\nu,u,d) are
given by vacuum expectation values of gauge singlet
scalars (yukawaons) Y_f with 3\times 3 flavor components,
it is tried to give a unified description of quark and lepton
mass matrices.
Especially, without assuming any discrete symmetry in the
lepton sector, nearly tribimaximal mixing is derived
by assumed a simple up-quark mass matrix form.
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