91 citations · 865 across the 52 of their papers we have counts for
8 papers · 1 filter
Bosonic-Seesaw Portal Dark Matter
Hiroyuki Ishida, Shinya Matsuzaki, Yuya Yamaguchi
We discuss a new type of Higgs-portal dark matter (DM)-production mechanism, called bosonic-seesaw portal (BSP) scenario. The BS provides the dynamical origin of the electroweak sy…
Accommodation of the Dirac Phase in the Krauss-Nasri-Trodden Model
Kingman Cheung, Hiroyuki Ishida, Hiroshi Okada
We investigate one of the radiative models, Kraus-Nasri-Trodden model, with the maximal value of Dirac CP violating phase, is -π/2 (or equivalently 3π/2), which is preferred in…
Lepton number violation by heavy Majorana neutrino in decays
Takehiko Asaka, Hiroyuki Ishida
Heavy Majorana neutrinos are predicted in addition to ordinary active neutrinos in the models with the seesaw mechanism. We investigate the lepton number violation (LNV) in dec…
Naturalness and lepton number/flavor violation in inverse seesaw models
Naoyuki Haba, Hiroyuki Ishida, Yuya Yamaguchi
We introduce three right-handed neutrinos and three sterile neutrinos, and consider an inverse seesaw mechanism for neutrino mass generation. From naturalness point of view, their…
Multiple-point principle with a scalar singlet extension of the Standard Model
Naoyuki Haba, Hiroyuki Ishida, Nobuchika Okada +1
We suggest a scalar singlet extension of the standard model, in which the multiple-point principle (MPP) condition of a vanishing Higgs potential at the Planck scale is realized. A…
On neutrinoless double beta decay in the MSM
Takehiko Asaka, Shintaro Eijima, Hiroyuki Ishida
We consider the neutrinoless double beta () decay in the so-called MSM, in which three right-handed neutrinos with masses below the electroweak scale are additionally intr…