231 citations · 2.6k across the 73 of their papers we have counts for
7 papers · 1 filter
Effect of Degenerate Particles on Internal Bremsstrahlung of Majorana Dark Matter
Hiroshi Okada, Takashi Toma
Gamma-rays induced by annihilation or decay of dark matter can be its smoking gun signature. In particular, gamma-rays generated by internal bremsstrahlung of Majorana and real sca…
Inert Extension of the Zee-Babu Model
Hiroshi Okada, Takashi Toma, Kei Yagyu
We propose a two-loop induced Zee-Babu type neutrino mass model at the TeV scale. Although there is no dark matter candidate in the original Zee-Babu model, that is contained in ou…
Sharp Gamma-ray Spectral Features from Scalar Dark Matter Annihilations
Alejandro Ibarra, Takashi Toma, Maximilian Totzauer +1
The search for sharp features in the gamma-ray spectrum is a promising approach to identify a signal from dark matter annihilations over the astrophysical backgrounds. In this pape…
Impact of Semi-annihilation of Z3 Symmetric Dark Matter with Radiative Neutrino Masses
Mayumi Aoki, Takashi Toma
We investigate a Z3 symmetric model with two-loop radiative neutrino masses. Dark matter in the model is either a Dirac fermion or a complex scalar as a result of an unbroken Z3 sy…
3.55 keV X-ray Line Signal from Excited Dark Matter in Radiative Neutrino Model
Hiroshi Okada, Takashi Toma
We study an exciting dark matter scenario in a radiative neutrino model to explain the X-ray line signal at keV recently reported by XMN-Newton X-ray observatory using data…
Lepton Flavor Violation in the Scotogenic Model
Takashi Toma, Avelino Vicente
We investigate lepton flavor violation in the scotogenic model proposed by Ma in which neutrinos acquire non-zero masses at the 1-loop level. Although some works exist in this dire…