225 research outputs found

### Permutation Symmetry S_3 and VEV Structure of Flavor-Triplet Higgs Scalars

A model with flavor-triplet Higgs scalars \phi_i (i=1,2,3)is investigated
under a permutation symmetry S_3 and its symmetry breaking. A possible S_3
breaking form of the Higgs potential whose vacuum expectation values v_i=<
\phi_i> satisfy a relation v_1^2 +v_2^2 +v_3^2 ={2/3}(v_1 +v_2 +v_3)^2 is
investigated, because if we suppose a seesaw-like mass matrix model M_e = m
M^{-1} m with m_{ij} \propto \delta_{ij} v_i and M_{ij} \propto \delta_{ij},
such a model can lead to the well-known charged lepton mass relation m_e +m_\mu
+m_\tau = {2/3} (\sqrt{m_e}+\sqrt{m_\mu} +\sqrt{m_\tau})^2.Comment: 7 pages, 1 figure, final version to appear in PR

### Charged Lepton Mass Formula -- Development and Prospect --

The recent devolopment on the charged lepton mass forumula
m_e+m_{\mu}+m_{\tau}={2/3}(\sqrt{m_e}+\sqrt{m_\mu}+\sqrt{m_{\tau}})^2 is
reviewed. An S_3 or A_4 model will be promising for the mass relation.Comment: Latex, 11 pages, no figure, Talk at Internationa Workshop on Neutrino
Masses and Mixing, at Shizuoka, Japan, December, 17-19, 200

### 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.Comment: 4 pages, to appear in Proceedings of Lepton-Photon 200

### 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 is derived without referring to
an explicit form of $V(\Phi)$.Comment: 9 pages, no figure, version to appear in Phys.Rev.

### Universal Seesaw Mass Matrix Model and SO(10)\times SO(10) Unification

On the universal seesaw mass matrix model, which is a promising model of the
unified description of the quark and lepton mass matrices, the behaviors of the
gauge coupling constants and intermediate energy scales in the SO(10)_L\times
SO(10)_R model are investigated related to the neutrino mass generation
scenarios. The unification of the gauge coupling constants in the framework of
the non-SUSY model is possible if the SO(10) symmetry is broken via Pati-Salam
type symmetries.Comment: Latex, 20 pages + one figur

### Charged Lepton Mass Relations in a Supersymmetric Yukawaon Model

According to an idea that effective Yukawa coupling constants Y_f^{eff} are
given vacuum expectation values of fields ("Yukawaons") Y_f as
Y_f^{eff}=y_f /\Lambda, a possible superpotential form in the charged
lepton sector under a U(3) [or O(3)] flavor symmetry is investigated. It is
found that a specific form of the superpotential can lead to an empirical
charged lepton mass relation without any adjustable parameters.Comment: 9 pages, no figure, final version to appear in Phys.Rev.

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