206 citations · 1.3k across the 55 of their papers we have counts for
51 papers · 1 filter
Stellar cooling limits on light scalar boson revisited
Yasuhiro Yamamoto, Koichi Yoshioka
We revisit the stellar cooling limits on the light scalar boson whose coupling to the Standard Model particles is described by its mixing with the Higgs boson. Strong constraints h…
Quantum current dissipation in superconducting strings and vortons
Yoshihiko Abe, Yu Hamada, Kota Saji +1
In this work, the current stability is discussed for cosmic strings with the bosonic superconductivity. A non-vanishing curvature of string generally induce the quantum instability…
Leptonic CP asymmetry and Light flavored scalar
Yoshihiko Abe, Toshimasa Ito, Koichi Yoshioka
We consider a situation where right-handed neutrinos couple to a light scalar which is possibly a Nambu-Goldstone boson resulting from high-energy symmetry breaking. Its coupling i…
Non-thermal Production of PNGB Dark Matter and Inflation
Yoshihiko Abe, Takashi Toma, Koichi Yoshioka
A pseudo Nambu-Goldstone boson (pNGB) is a natural candidate of dark matter in that it avoids the severe direct detection bounds. We show in this paper that the pNGB has another di…
Electroweak axion string and superconductivity
Yoshihiko Abe, Yu Hamada, Koichi Yoshioka
We study the axion strings with the electroweak gauge flux in the DFSZ axion model and show that these strings, called the electroweak axion strings, can exhibit superconductivity…
TeV-scale Majorogenesis
Yoshihiko Abe, Yu Hamada, Takahiro Ohata +2
The Majoron, the Nambu-Goldstone boson of lepton number symmetry, is an interesting candidate for dark matter as it deeply connects the dark matter and neutrino physics. In this pa…
Higgs Boson Mass and Muon g-2 with Strongly Coupled Vector-like Generations
Michinobu Nishida, Koichi Yoshioka
We study the Higgs boson mass and the muon anomalous magnetic moment (the muon ) in a supersymmetric standard model with vector-like generations. The infrared physics of the m…
Runaway, D term and R-symmetry Breaking
Tatsuo Azeyanagi, Tatsuo Kobayashi, Atsushi Ogasahara +1
We study the D-term effect on runaway directions of the F-term scalar potential. A minimal renormalizable model is presented where supersymmetry is broken without any pseudomoduli.…
D term and gaugino masses in gauge mediation
Tatsuo Azeyanagi, Tatsuo Kobayashi, Atsushi Ogasahara +1
We systematically study supersymmetry breaking with non-vanishing F and D terms. We classify the models into two categories and find that a certain class of models necessarily has…
Universally Leptophilic Dark Matter From Non-Abelian Discrete Symmetry
Naoyuki Haba, Yuji Kajiyama, Shigeki Matsumoto +2
The positron anomaly recently reported by the cosmic-ray measurements can be explained by the decaying dark matter scenario, where it decays mainly into leptons with the lifetime o…
Extra dimensions and Seesaw Neutrinos at the International Linear Collider
Tomoyuki Saito, Masaki Asano, Keisuke Fujii +6
We study the capability of the international linear collider (ILC) to probe extra dimensions via the seesaw mechanism. In the scenario we study, heavy Kaluza-Klein neutrinos genera…
Seesaw in the bulk
Atsushi Watanabe, Koichi Yoshioka
A five-dimensional seesaw framework is analyzed with the lepton-number-violating propagator of bulk right-handed neutrinos. That can bypass summing up the effects of heavy Majorana…
Deep Correlation Between Cosmic-Ray Anomaly and Neutrino Masses
Shigeki Matsumoto, Koichi Yoshioka
The positron anomaly recently reported by the cosmic-ray measurements suggests that, if explained by the decay of dark matter particle, the decay source is closely linked up with t…
Seesaw Neutrino Signals at the Large Hadron Collider
Shigeki Matsumoto, Takehiro Nabeshima, Koichi Yoshioka
We discuss the scenario with gauge singlet fermions (right-handed neutrinos) accessible at the energy of the Large Hadron Collider. The singlet fermions generate tiny neutrino mass…
Geometry-free neutrino masses in curved spacetime
Atsushi Watanabe, Koichi Yoshioka
The seesaw-induced neutrino mass is discussed in a generic class of curved spacetime, including the flat and warped extra dimensions. For Majorana masses in the bulk and on the bou…
Observable Seesaw and its Collider Signatures
Naoyuki Haba, Shigeki Matsumoto, Koichi Yoshioka
We discuss the scenario with TeV-scale right-handed neutrinos, which are accessible at future colliders, while holding down tiny seesaw-induced masses and sizable couplings to the…
Flavor Symmetry Breaking and Vacuum Alignment on Orbifolds
Tatsuo Kobayashi, Yuji Omura, Koichi Yoshioka
Flavor symmetry has been widely studied for figuring out the masses and mixing angles of standard-model fermions. In this paper we present a framework for handling flavor symmetry…
Low-scale Gaugino Mass Unification
Motoi Endo, Koichi Yoshioka
We study a new class of scenarios with the gaugino mass unification at the weak scale. The general condition is first derived for the unification to occur. Among the general cases,…
Tri-bimaximal Mixing from Cascades
Naoyuki Haba, Ryo Takahashi, Morimitsu Tanimoto +1
We study fermion mass matrices of the cascade form which are compatible with the tri-bimaximal lepton mixing and generation mass hierarchy. The flat-cascade lepton matrices imply a…
Holographic Construction of Technicolor Theory
Takayuki Hirayama, Koichi Yoshioka
We construct a dual description of technicolor theory based on the D4/D8 brane configuration. A strongly-coupled technicolor theory is identified as the effective theory on D-brane…
New Approach to Texture-zeros with S_3 symmetry - Flavor Symmetry and Vacuum Aligned Mass Textures -
Satoru Kaneko, Hideyuki Sawanaka, Takaya Shingai +2
A texture-zeros is an approach to reduce the number of free parameters in Yukawa couplings and it is one of the most attractive ones. In our paper, we discuss the origin of zero-st…
Probing flavor structure in unified theory with scalar spectroscopy
Kenzo Inoue, Kentaro Kojima, Koichi Yoshioka
The flavor structure in unified theory is probed with superparticle mass spectrum observed in future particle experiments. A key ingredient is the generation dependence of scalar m…
Soft Supersymmetry Breaking at Heavy Chiral Threshold
Hiroyuki Matsuura, Hiroaki Nakano, Koichi Yoshioka
We discuss the structure of threshold corrections to soft supersymmetry-breaking parameters at the mass threshold of heavy chiral superfields. Nontrivial dependence on soft paramet…
Higgs Potential and Texture-zeros in Supersymmetric Standard Model
Satoru Kaneko, Hideyuki Sawanaka, Takaya Shingai +2
The mass matrix forms of quarks and leptons are discussed in theory with permutation flavor symmetry. The structure of scalar potential is analyzed in case that electroweak doublet…