122 citations · 949 across the 49 of their papers we have counts for
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SU(9) grand unified model with rank-reducing discrete boundary conditions on
Yoshiharu Kawamura, Kentaro Kojima, Toshifumi Yamashita
We study a six-dimensional SU(9) grand unified model with rank-reducing discrete boundary conditions and continuous Wilson line phases on the orbifold . We show th…
Models with rank-reducing discrete boundary conditions on
Yoshiharu Kawamura, Eiji Kodaira, Kentaro Kojima +1
We study six-dimensional gauge models with rank-reducing discrete boundary conditions on the orbifold , without and with continuous Wilson line phases. F…
Long-lived Higgsino pairs decaying within the LHC detectors
Francesca Borzumati, Kaoru Hagiwara, Kentarou Mawatari +2
Pair-produced long-lived lightest Higgsinos decaying within a few meters in the LHC detectors are considered. The relatively light nearly-pure Higgsino states object of this study…
Grand Gauge-Higgs Unification on via Diagonal Embedding Method
Kentaro Kojima, Kazunori Takenaga, Toshifumi Yamashita
We study a novel six-dimensional gauge theory compactified on the orbifold utilizing the diagonal embedding method. The bulk gauge group is ,…
Dirac gaugino from grand gauge-Higgs unification
Hiroaki Nakano, Masamichi Sato, Osamu Seto +1
We show that models of the Dirac gaugino can naturally be embedded into a kind of the grand unified theory (GUT), the grand gauge-Higgs unification (gGHU) model, with the gauge gro…
Charged Lepton Mass Relations in a SUSY Scenario
Yoshio Koide, Toshifumi Yamashita
The observed charged lepton masses satisfy the relations and $κ\equiv \sqrt{m_e m_μm_τ}/(\sqrt{m_e} +\sqrt{m_μ…
The Standard Model Gauge Symmetry from Higher-Rank Unified Groups in Grand Gauge-Higgs Unification Models
Kentaro Kojima, Kazunori Takenaga, Toshifumi Yamashita
We study grand unified models in the five-dimensional space-time where the extra dimension is compactified on . The spontaneous breaking of unified gauge symmetries is ach…
Gauge Symmetry Breaking Patterns in an SU(5) Grand Gauge-Higgs Unification
Kentaro Kojima, Kazunori Takenaga, Toshifumi Yamashita
We study gauge symmetry breaking patterns of the five-dimensional grand gauge-Higgs unification compactified on an orbifold with the Hosotani mechanism…
Higgs as a probe of supersymmetric grand unification with the Hosotani mechanism
T. Yamashita
The supersymmetric grand unified theory where the gauge symmetry is broken by the Hosotani mechanism provides a natural solution to the so-called doublet-triplet splitting…
term and supersymmetry breaking from six dimensional theory
Yuki Adachi, Naoyuki Haba, Toshifumi Yamashita
We propose a new next-to-minimal supersymmetric standard model (NMSSM) which is on a six-dimensional spacetime compactified on a orbifold. In this model, three gauge sing…
Higgs as a Probe of Supersymmetric Grand Unification with the Hosotani Mechanism
Mitsuru Kakizaki, Shinya Kanemura, Hiroyuki Taniguchi +1
The supersymmetric grand unified theory where the SU(5) gauge symmetry is broken by the Hosotani mechanism predicts the existence of adjoint chiral superfields whose masses are at…
Grand Unified Theories and Higgs Physics
T. Yamashita
The grand unified theories are theoretically well motivated, but they typically have less direct indications on the low energy physics and it is not easy to test them. Here, we dis…
Family Gauge Bosons with an Inverted Mass Hierarchy
Yoshio Koide, Toshifumi Yamashita
A model that gives family gauge bosons with an inverted mass hierarchy is proposed, stimulated by Sumino's cancellation mechanism for the QED radiative correction to the charged le…
Family Gauge Bosons with an Inverted Mass Hierarchy
Yoshio Koide, Toshifumi Yamashita
A model that gives family gauge bosons with an inverted mass hierarchy is proposed, stimulated by Sumino's cancellation mechanism for the QED radiative correction to the charged le…
Doublet-Triplet Splitting in an SU(5) Grand Unification
Toshifumi Yamashita
We present a new solution to the doublet-triplet splitting problem which also works in a supersymmetric SU(5) grand unified theory and is testable at TeV-scale collider experiments…
Grand Gauge-Higgs Unification
Kentaro Kojima, Kazunori Takenaga, Toshifumi Yamashita
We propose a novel way to break grand unified gauge symmetries via the Hosotani mechanism in models that can accommodate chiral fermions. Adjoint scalar fields are realized through…
E6 grand unified theory with three generations from heterotic string
Motoharu Ito, Shogo Kuwakino, Nobuhiro Maekawa +5
We construct two more supersymmetric E6 grand unified models with three generations within the framework of Z12 asymmetric orbifold compactification of the heterotic string theory.…
Gauge-Higgs Dark Matter
Naoyuki Haba, Shigeki Matsumoto, Nobuchika Okada +1
When the anti-periodic boundary condition is imposed for a bulk field in extradimensional theories, independently of the background metric, the lightest component in the anti-perio…
The nrMSSU(5) and universality of soft masses
F. Borzumati, T. Yamashita
We discuss the problem of universality of the soft, supersymmetry-breaking terms in the minimal supersymmetric SU(5) model (MSSU(5)) completed with flavor-dependent nonrenormalizab…
Tree-level unitarity in Gauge-Higgs Unification
Naoyuki Haba, Yutaka Sakamura, Toshifumi Yamashita
We numerically estimate a scale at which tree-level unitarity is violated in the gauge-Higgs unification model by evaluating amplitudes for scatterin…
Weak boson scattering in Gauge-Higgs Unification
Naoyuki Haba, Yutaka Sakamura, Toshifumi Yamashita
The scattering amplitude for the longitudinal weak bosons is investigated in the SU(3) gauge-Higgs unification as a function of the scattering energy, the Wilson line phase θ_H and…
Minimal supersymmetric SU(5) model with nonrenormalizable operators: Seesaw mechanism and violation of flavour and CP
Francesca Borzumati, Toshifumi Yamashita
Flavour and CP violations that the neutrino-seesaw couplings of types I, II, and III induce radiatively in the soft massive parameters of the minimal supersymmetric SU(5) model, ma…
Effective Potential of Higgs Field in Warped Gauge-Higgs Unification
Naoyuki Haba, Shigeki Matsumoto, Nobuchika Okada +1
The gauge-Higgs unification is one of influential scenarios to solve the hierarchy problem in the Standard Model. Recently, the scenario on the warped background attracts many atte…
Multi-Higgs Mass Spectrum in Gauge-Higgs Unification
Kentaro Kojima, Kazunori Takenaga, Toshifumi Yamashita
We study an SU(2) supersymmetric gauge model in a framework of gauge-Higgs unification. Multi-Higgs spectrum appears in the model at low energy. We develop a useful perturbative ap…