92 citations · 341 across the 24 of their papers we have counts for
24 papers
Direct Detection and Cosmological Constraints of Dark Matter with Dark Dipoles
Takumi Kuwahara, Jun-Chen Wang, Shu-Run Yuan
We study a fermionic dark matter candidate that couples to the standard model particles exclusively through electric and magnetic dipole operators mediated by a massive dark photon…
Composite Asymmetric Dark Matter Assisted by Primordial Black Holes Evaporation
Takumi Kuwahara, Yoshiki Uchida
We investigate a cogenesis scenario for composite asymmetric dark matter framework: a dark sector has a similar strong dynamics to quantum chromodynamics in the standard model, and…
Revisiting Q-ball Interactions with Matters
Ayuki Kamada, Takumi Kuwahara, Keiichi Watanabe
Q-ball dark matter is one of the candidates for the macroscopic dark matter: Q-ball is a non-topological solitonic configuration, whose stability can be ensured by global charge an…
Composite asymmetric dark matter with a dark photon portal: Multimessenger tests
Saikat Das, Ayuki Kamada, Takumi Kuwahara +2
Composite asymmetric dark matter (ADM) is the framework that naturally explains the coincidence of the baryon density and the dark matter density of the Universe. Through a portal…
Mediator Decay through mixing with Degenerate Spectrum
Ayuki Kamada, Takumi Kuwahara, Shigeki Matsumoto +2
The decay of the mediator particle into standard model (SM) particles plays a significant role in exploring the dark sector scenario. We consider such a decay, taking the dark phot…
Quantum Theory of Dark Matter Scattering
Ayuki Kamada, Takumi Kuwahara, Ami Patel
Dark matter self-scattering is one of key ingredients for small-scale structure of the Universe, while dark matter annihilation is important for the indirect measurements. There is…
Dark Vector Mesons at LHC Forward Detector Searches
Takumi Kuwahara, Shu-Run Yuan
Confining gauge dynamics in dark sector is promising to provide dark matter with a mass in the range of sub-GeV to GeV. These dark sectors consist of composite particles, such as d…
Perturbative Unitarity of Strongly Interacting Massive Particle Models
Ayuki Kamada, Shin Kobayashi, Takumi Kuwahara
Dark pion is a promising candidate for the strongly interacting massive particle dark matter. A large pion self-coupling tends to be required for correct relic abundance,…
LHC Lifetime Frontier and Visible Decay Searches in Composite Asymmetric Dark Matter Models
Ayuki Kamada, Takumi Kuwahara
The LHC lifetime frontier will probe dark sector in near future, and the visible decay searches at fixed-target experiments have been exploring dark sector. Composite asymmetric da…
Maximally self-interacting dark matter: models and predictions
Ayuki Kamada, Hee Jung Kim, Takumi Kuwahara
We study self-interacting dark matter (SIDM) scenarios, where the -wave self-scattering cross section almost saturates the Unitarity bound. Such self-scattering cross sections a…
Lessons from on inflation models: two-loop renormalization of in the scalar QED
Ayuki Kamada, Takumi Kuwahara
A non-minimal coupling has been attracting growing interest particularly in the context of inflation models, though its quantum nature is not clear yet. We study the renormaliz…
Lessons from on inflation models: two-scalar theory and Yukawa theory
Ayuki Kamada, Takumi Kuwahara
We demonstrate two properties of the trace of the energy-momentum tensor in the flat spacetime. One is the decoupling of heavy degrees of freedom; i.e., heavy degrees o…
Baryon-Dark Matter Coincidence in Mirrored Unification
Masahiro Ibe, Ayuki Kamada, Shin Kobayashi +2
About 80\% of the mass of the present Universe is made up of the unknown (dark matter), while the rest is made up of ordinary matter. It is a very intriguing question why the {\it…
Renormalization Effects on Electric Dipole Moments in Electroweakly Interacting Massive Particle Models
Takumi Kuwahara
The extended models of the standard model with a single Majorana fermion could be realized as the low-energy effective theory of the well-motivated ultraviolet models. We study the…
Renormalization Effects on Electric Dipole Moments in Electroweakly Interacting Massive Particle Models
Wataru Kuramoto, Takumi Kuwahara, Ryo Nagai
We study the renormalization effects on electric dipole moments in the models with new electroweakly interacting massive fermions. The electric dipole moments are generated by the…
Ultraviolet Completion of a Composite Asymmetric Dark Matter Model with a Dark Photon Portal
Masahiro Ibe, Ayuki Kamada, Shin Kobayashi +2
Composite asymmetric dark matter scenarios naturally explain why the dark matter mass density is comparable with the visible matter mass density. Such scenarios generically require…
Revisiting Flavor and CP Violation in Supersymmetric SU(5) with Right-Handed Neutrinos
Jason L. Evans, Kenji Kadota, Takumi Kuwahara
We revisit the minimal supersymmetric SU(5) grand unified theory with three right-handed neutrinos in which universality conditions for soft-supersymmetry breaking parameters are i…
Two-loop Anomalous Dimensions for Four-Fermi Operators in Supersymmetric Theories
Junji Hisano, Takumi Kuwahara, Yuji Omura +1
We derive two-loop anomalous dimensions for four-Fermi operators in supersymmetric theories using the effective Kahler potential. We introduce the general forms in generic gauge th…
Light Stops, Heavy Higgs, and Heavy Gluinos in Supersymmetric Standard Models with Extra Matters
Junji Hisano, Wataru Kuramoto, Takumi Kuwahara
We have explored the possibilities of scenarios with heavy gluinos and light stops in supersymmetric (SUSY) standard models with extra vector-like multiplets. If we assume the hier…
Threshold Corrections to Dimension-six Proton Decay Operators in Non-minimal SUSY SU(5) GUTs
Borut Bajc, Junji Hisano, Takumi Kuwahara +1
We calculate the high and low scale threshold corrections to the D=6 proton decay mode in supersymmetric SU(5) grand unified theories with higher-dimensional representation Higgs m…
Nucleon Electric Dipole Moments in High-Scale Supersymmetric Models
Junji Hisano, Daiki Kobayashi, Wataru Kuramoto +1
The electric dipole moments (EDMs) of electron and nucleons are promising probes of the new physics. In generic high-scale supersymmetric (SUSY) scenarios such as models based on m…
Threshold Corrections to Baryon Number Violating Operators in Supersymmetric SU(5) GUTs
Junji Hisano, Takumi Kuwahara, Yuji Omura
The nucleon decay is a significant phenomenon to verify grand unified theories (GUTs). For the precise prediction of the nucleon lifetime induced by the gauge bosons associated wit…
Decoupling Can Revive Minimal Supersymmetric SU(5)
Junji Hisano, Daiki Kobayashi, Takumi Kuwahara +1
We revisit proton decay via the color-triplet Higgs multiplets in the minimal supersymmetric grand unified model with heavy sfermions. Although the model has been believed to be ex…
Grand Unification in High-scale Supersymmetry
Junji Hisano, Takumi Kuwahara, Natsumi Nagata
A constraint on masses of superheavy gauge and Higgs multiplets at the grand unification (GUT) scale is obtained from the gauge coupling unification in the case of high-scale super…