50 citations · 87 across the 7 of their papers we have counts for
5 papers
Sneutrinos as two inflatons and curvaton and leptogenesis
Tomo Takahashi, Toshifumi Yamada, Shuichiro Yokoyama
We argue that sneutrinos can be embedded in a multi-field inflation framework where two inflatons and a curvaton simultaneously contribute to primordial fluctuations, which is cons…
Proton Decay Prediction in 5D Gauge-Higgs Unification
Naoyuki Haba, Nobuchika Okada, Toshifumi Yamada
The Higgs boson mass and top quark mass imply that the Higgs quartic coupling vanishes around the scale of GeV, depending on the precise value of the top quark mas…
3.5-keV X-ray line from nearly-degenerate WIMP dark matter decays
Cheng-Wei Chiang, Toshifumi Yamada
The unidentified emission line at the energy of 3.5~keV observed in X-rays from galaxy clusters may originate from a process involving a dark matter particle. On the other ha…
T-odd Asymmetry in W+jet Events at the LHC
Rikkert Frederix, Kaoru Hagiwara, Toshifumi Yamada +1
W bosons produced at high transverse momentum in hadron collisions can have polarization along the direction perpendicular to the production plane, which is odd under nave-…
Electroweak Phase Transition in Georgi-Machacek Model
Cheng-Wei Chiang, Toshifumi Yamada
The Georgi-Machacek model extends the standard model Higgs sector by adding two isospin triplet scalar fields and imposing global SU(2) symmetry on them. A feature of the model…