292 research outputs found
Universality of Quark-Lepton Mass Matrix
The recently observed lepton mixing angle of the MNS mixing
matrix is well incorporated in a universal mixing hypothesis between quark and
lepton sectors. This hypothesis asserts that, in the charged lepton diagonal
base, all other mass matrices for up- and down-type quarks and light neutrinos
are diagonalized by the same unitary matrix except for the phase elements. It
is expressed as for
quark mixing matrix and lepton mixing matrix in the
phenomenological level. Here is a diagonal phase mass matrix.
is a slightly different phase parameter from the Dirac CP
violating phase (best fit) in the MNS lepton mixing matrix.Comment: 6 pages, 2 figures, accepted by MPL
Simple neutrino mass matrix with only two free parameters
A simple form of neutrino mass matrix which has only two free parameters is
proposed from a phenomenological point of view. Using this mass matrix, we
succeed to reproduce all the observed values for the MNS lepton mixing angles
and the neutrino mass squared difference ratio. Our model also predicts
for the Dirac CP violating phase in the lepton sector
and the effective neutrino mass eV in the
neutrinoless double beta decay.Comment: 7 pages, 3 figure
Measuring the lower bound of the neutrino mass at the LHC in Higgs triplet model
We show in the framework of Higgs triplet model that the lower bound of the
neutrino mass is obtained if we can measure at the LHC.Comment: 5 pages, 2 figures, revised version in Pyhs.Rev.D. Using the reduced
luminosity of LHC, we added the estimation on the order of magnitude of the
considering reaction
Simple mass matrices of neutrinos and quarks consistent with observed mixings and masses
We propose a simple phenomenological model of quarks-leptons mass matrices
having fundamentally universal symmetry structure. These mass matrices consist
of democratic and semi-democratic mass matrix terms commonly to the neutrino
and the quark sectors and have only eight free parameters. We show that this
mass matrix model well reproduces all the observed values of the MNS lepton and
the CKM quark mixing angles, the neutrino mass squared difference ratio, and
quark mass ratios, with an excellent agreement. The model also predicts
for the leptonic violating phase and
eV for the effective Majorana neutrino mass.Comment: 10 pages, 3 figures. Accepted version by Physics Letters
Universal Texture of Quark and Lepton Mass Matrices
Against the conventional picture that the mass matrix forms in the quark
sectors will take somewhat different structures from those in the lepton
sectors, a possibility that all the mass matrices of quarks and leptons have
the same form as in the neutrinos is investigated. For the lepton sectors, the
model leads to a nearly bimaximal mixing with the prediction
|U_{e3}|^2=m_e/2m_\mu=0.0024 and \tan^2\theta_{sol} \simeq m_{\nu 1}/m_{\nu 2},
and so on. For the quark sectors, it can lead to reasonable values of the CKM
mixing matrix and masses: |V_{us}|\simeq \sqrt{m_d/m_s}, |V_{ub}| \simeq
|V_{cb}|\sqrt{m_u/m_c}, |V_{td}| \simeq |V_{cb}|\cdot |V_{us}|, and so on.Comment: 9 pages, Latex, talk given at The 4th workshop on "Neutrino
Oscillations and their Origin" (NOON2003) (Kanazawa, Japan, 10--14 Feb.
2002). To appear in the Proceeding
Constraints from Neutrinoless Double Beta Decay
We examine the constraints from the recent HEIDELBERG-MOSCOW double beta
decay experiment. It leads us to the almost degenerate or inverse hierarchy
neutrino mass scenario. In this scenario, we obtain possible upper bounds for
the Majorana CP violating phase in the lepton sector by incorporating the data
from the neutrino oscillation, the single beta decay experiments, and from the
astrophysical observation. We also predict the neutrino mass that may be
measurable in the future beta decay experiments.Comment: 10 pages, 3 figure
Constraints of mixing angles from neutrino oscillation experiments and neutrinoless double beta decay
From the analyses of the recent data of neutrino oscillation experiments
(especially the CHOOZ and the Super KAMIOKANDE experiments), we discuss how
these data affect the neutrinoless double beta decay ()
rate and vice versa assuming that neutrinos are Majorana particles. For the
case that ( are neutrino masses), we obtain, from
the data of the CHOOZ and Super KAMIOKANDE, and . Combining the latter constraint with
the analysis of the "averaged" neutrino mass () appeared in , we find that (\frac{-m_2}{m_3-m_2}<\sin^2 \theta_{13}
\le 0.05), which leads to the constraint on () as ( \le 0.05
m_3+(1-0.05)m_2). For the case that , we find that the
data of neutrino oscillation experiments and imply the
constraints of mixing angles.Comment: 12pp, LaTeX, 6 Figure
- …