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Distinguishing Dark Matter Annihilation Enhancement Scenarios via Halo Shapes
Masahiro Ibe, Hai-bo Yu
Sommerfeld enhancement and Breit-Wigner enhancement of the dark matter annihilation have been proposed to explain the "boost factor" which is suggested by observed cosmic ray exces…
Neutralino Dark Matter in Gauge Mediation in Light of CDMS-II
Masahiro Ibe, Tsutomu T. Yanagida
A recent observation of the two candidate events of the dark matter recoiling at CDMS-II is suggestive of dark matter with a mass not far above 100GeV. We propose a model of gauge…
Cosmic Ray Spectra in Nambu-Goldstone Dark Matter Models
Masahiro Ibe, Hitoshi Murayama, Satoshi Shirai +1
We discuss the cosmic ray spectra in annihilating/decaying Nambu-Goldstone dark matter models. The recent observed positron/electron excesses at PAMELA and Fermi experiments are we…
Studying Gaugino Mass in Semi-Direct Gauge Mediation
M. Ibe, Izawa K. -I., Y. Nakai
We study gaugino mass generation in the context of semi-direct gauge mediation models, where the messengers are charged under both the hidden sector and the standard model gauge gr…
Small steps towards Grand Unification and the electron/positron excesses in cosmic-ray experiments
Masahiro Ibe
We consider a small extension of the standard model by adding two Majorana fermions; those are adjoint representations of the SU(2)_L and SU(3)_c gauge groups of the standard model…
Nambu-Goldstone Dark Matter and Cosmic Ray Electron and Positron Excess
Masahiro Ibe, Yu Nakayama, Hitoshi Murayama +1
We propose a model of dark matter identified with a pseudo-Nambu-Goldstone boson in the dynamical supersymmetry breaking sector in a gauge mediation scenario. The dark matter parti…