150 research outputs found
Realization of the Lepton Flavor Structure from Point Interactions
We investigate a 5d gauge theory on with point interactions. The point
interactions describe extra boundary conditions and provide three generations,
the charged lepton mass hierarchy, the lepton flavor mixing and tiny
degenerated neutrino masses after choosing suitable boundary conditions and
parameters. The existence of the restriction in the flavor mixing, which
appears from the configuration of the extra dimension, is one of the features
of this model. Tiny Yukawa couplings for the neutrinos also appears without the
see-saw mechanism nor symmetries in our model. The magnitude of CP violation in
the leptons can be a prediction and is consistent with the current experimental
data.Comment: 9 pages, 3 figures, 3rd International Conference on New Frontiers in
Physic
Realization of lepton masses and mixing angles from point interactions in an extra dimension
We investigate a model on an extra dimension where plenty of effective
boundary points described by point interactions (zero-thickness branes) are
arranged. After suitably selecting the conditions on these points for each type
of five-dimensional fields, we realize the tiny active neutrino masses, the
charged lepton mass hierarchy, and lepton mixings with a CP-violating phase,
simultaneously. Not only the quark's but also the lepton's configurations are
generated in a unified way with acceptable accuracy, with neither the see-saw
mechanism nor symmetries in Yukawa couplings, by suitably setting the model
parameters, even though their flavor structures are dissimilar each other. One
remarkable point is that a complex vacuum expectation value of the
five-dimensional Higgs doublet in this model becomes the common origin of the
CP violation in both quark and lepton sectors. The model can be consistent with
the results of the precision electroweak measurements and Large Hadron Collider
experiments.Comment: 29 pages, 7 figures (v1); 28 pages, 7 figures in JHEP style file,
published version in JHEP, a subsection added, typo fixed (v2
6d Dirac fermion on a rectangle; scrutinizing boundary conditions, mode functions and spectrum
We classify possible boundary conditions of a 6d Dirac fermion on a
rectangle under the requirement that the 4d Lorentz structure is maintained,
and derive the profiles and spectrum of the zero modes and nonzero KK modes
under the two specific boundary conditions, (i) 4d-chirality positive
components being zero at the boundaries and (ii) 2d-chirality positive
components being zero at the boundaries. In the case of (i), twofold
degenerated chiral zero modes appear which are localized towards specific
directions of the rectangle pointed by an angle parameter . This leads
to an implication for a new direction of pursuing the origin of three
generations in the matter fields of the standard model, even though
triple-degenerated zero modes are not realized in the six dimensions. The
emergence of the angle parameter originates from a rotational symmetry
in the degenerated chiral zero modes on the rectangle extra dimensions since
they do not feel the boundaries. In the case of (ii), this rotational symmetry
is promoted to the two-dimensional conformal symmetry though no chiral massless
zero mode appears. We also discuss the correspondence between our model on a
rectangle and orbifold models in some details.Comment: 26 pages, 2 tables (v1); 39 pages, 3 tables, accepted to Nuclear
Physics B (v2
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