Publications (28)
A Simple Method of Calculating Effective Operators
N. Haba, K. Kaneta, S. Matsumoto +1
It is important to obtain effective operators by integrating out high energy degrees of freedom in physics. We suggest a general method of calculating accurate irrelevant operators…
Comment on ``Linking solar and long baseline terrestrial neutrino experiments''
N. Haba, Tomoharu Suzuki
We comment on ``Linking solar and long baseline terrestrial neutrino experiments''
Possible Flavor Mixing Structures of Lepton Mass Matrices
N. Haba, J. Sato, M. Tanimoto +1
To search for possible textures of lepton mass matrices, we systematically examine flavor mixing structures which can lead to large lepton mixing angles. We find out 37 mixing patt…
Unitarity in gauge symmetry breaking on orbifold
Y. Abe, N. Haba, Y. Higashide +2
We study the unitarity bounds of the scattering amplitudes in the extra dimensional gauge theory where the gauge symmetry is broken by the boundary condition. The estimation of the…
Baryogenesis from Dark Sector
N. Haba, S. Matsumoto
We propose a novel mechanism to generate a suitable baryon asymmetry from dark (hidden) sector. This is a Baryogenesis through a reverse pathway of the "asymmetric dark matter" sce…
Stability of the Lepton-Flavor Mixing Matrix Against Quantum Corrections
N. Haba, N. Okamura
Recent neutrino experiments suggest the strong evidences of tiny neutrino masses and the lepton-flavor mixing. Neutrino-oscillation solutions for the atmospheric neutrino anomaly a…
Energy-Scale Dependence of the Lepton-Flavor-Mixing Matrix
N. Haba, Y. Matsui, N. Okamura +1
We study an energy-scale dependence of the lepton-flavor-mixing matrix in the minimal supersymmetric standard model with the effective dimension-five operators which give the masse…
Fermion Mass Hierarchy in 6 dimensional SO(10) SUSY GUT
N. Haba, T. Kondo, Y. Shimizu
We suggest simple models which produce the suitable fermion mass hierarchies and flavor mixing angles based on the supersymmetric SO(10) grand unified theory in 6 dimensions compac…
Is really related to the solar neutrino solutions?
N. Haba, Tomoharu Suzuki
It has been said that the measurements of in the lepton flavor mixing matrix would help discriminate between the possible solar neutrino solutions under the natural condit…
The renormalization group analysis of the large lepton flavor mixing and the neutrino mass
N. Haba, N. Okamura, M. Sugiura
The Superkamiokande experiment suggests the large flavor mixing between nu_mu and nu_tau. We show that the mixing angle receives significant corrections from the renormalization gr…
Supersymmetry Breaking Without A Messenger Sector
N. Haba, N. Maru, T. Matsuoka
We propose a simple gauge-mediated supersymmetry breaking model in which suitable soft breaking masses are dynamically generated without relying on a messenger sector. This model i…
How Can We Obtain a Large Majorana-Mass in Calabi-Yau Models ?
N. Haba, C. Hattori, M. Matsuda +2
In a certain type of Calabi-Yau superstring models it is clarified that the symmetry breaking occurs by stages at two large intermediate energy scales and that two large intermedia…
Cosmological Constraint on the Zee model
N. Haba, K. Hamaguchi, Tomoharu Suzuki
It is well known that the Zee model induces small neutrino masses by radiative corrections, where the bi-maximal flavor mixing is possible. We analyze the cosmological condition in…
Zee Neutrino Mass Matrix in the Gauge Mediated Supersymmetry Breaking Scenario
N. Haba, M. Matsuda, M. Tanimoto
It is well known that Zee type neutrino mass matrix can provide bi-maximal neutrino mixing for three neutrinos. We study the reconciliation of this model with the gauge mediated su…
Model with Gauge Coupling Unification on Orbifold
N. Haba, T. Kondo, Y. Shimizu +2
We suggest a simple grand unified theory where the fifth dimensional coordinate is compactified on an orbifold. This model contains additional ${\bf 10 + \o…
Fermion Mass Hierarchy in Six Dimensional SO(10) Grand Unified Theory on a Orbifold
N. Haba, T. Kondo, Y. Shimizu
We suggest a simple supersymmetric SO(10) grand unified theory in 6 dimensions which produces the suitable fermion mass hierarchies. The 5th and 6th dimensional coordinates are com…
Phenomenology of Neutrino Mass Matrix
N. Haba, J. Sato, M. Tanimoto +1
The search for possible mixing patterns of charged leptons and neutrinos is important to get clues of the origin of nearly maximal mixings, since there are some preferred bases of…
Yukawa Interaction from a SUSY Composite Model
N. Haba, N. Okamura
We present a composite model that is based on non-perturbative effects of N=1 supersymmetric SU(N_C) gauge theory with N_f=N_C+1 flavors. In this model, we consider N_C=7, where al…
Analytic Solutions to the RG Equations of the Neutrino Physical Parameters
N. Haba, Y. Matsui, N. Okamura
In the case of two generation neutrinos, the energy-scale dependence of the lepton-flavor mixing matrix with Majorana phase can be governed by only one parameter r, which is the ra…
The effects of Majorana phases in three-generation neutrinos
N. Haba, Y. Matsui, N. Okamura
Neutrino-oscillation solutions for the atmospheric neutrino anomaly and the solar neutrino deficit can determine the texture of the neutrino mass matrix according to three types of…
Fermion Masses and Mixings in a String Inspired Model
N. Haba, C. Hattori, M. Matsuda +1
In the context of Calabi-Yau string models we explore the origin of characteristic pattern of quark-lepton masses and the CKM matrix. The discrete -symmetry is…
Supersymmetry Parameter Analysis: SPA Convention and Project
J. A. Aguilar-Saavedra, A. Ali, B. C. Allanach +122
High-precision analyses of supersymmetry parameters aim at reconstructing the fundamental supersymmetric theory and its breaking mechanism. A well defined theoretical framework is…
Fermion Mass Hierarchy in the Grand Unified Theory on Orbifold
N. Haba, Y. Shimizu, Tomoharu Suzuki +1
We suggest a simple grand unified theory where the fifth dimensional coordinate is compactified on an orbifold. This model is based on the supersymmetric fl…
The effect of Majorana phase in degenerate neutrinos
N. Haba, Y. Matsui, N. Okamura +1
There are physical Majorana phases in the lepton flavor mixing matrix when neutrinos are Majorana fermions. In the case of two degenerate neutrinos, the physical Majorana phase pla…
Are lepton flavor mixings in the democratic mass matrix stable against quantum corrections?
N. Haba, Y. Matsui, N. Okamura +1
We investigate whether the lepton flavor mixing angles in the so-called democratic type of mass matrix are stable against quantum corrections or not in the minimal supersymmetric s…
4D equivalence theorem and gauge symmetry on orbifold
Y. Abe, N. Haba, K. Hayakawa +3
We investigate the high-energy behavior of the scattering amplitudes in the extra dimensional gauge theory where the gauge symmetry is broken by the boundary condition. We study, i…
Large Lepton Flavor Mixing and E_6-type Unification Models
N. Haba, T. Matsuoka
There are experimental indications of large flavor mixing between and . In the unification models, in which the massless sector includes extra particles beyond the…
Examination of T/CP Invariance in the e+e- --> tau+ tau- Reaction
T. Ohshima, S. Suito, A. Sugiyama +2
We propose a method to examine the T/CP invariance of the heaviest lepton, tau, by means of a triple-momentum correlation for the reaction e^+e^- -->tau^+tau^-, tau --> e/mu nu nub…