336 citations · 8k across the 263 of their papers we have counts for
6 papers · 2 filters
A 3 X 2 texture for neutrino oscillations and leptogenesis
Biswajoy Brahmachari, Nobuchika Okada
In an economical system with only two heavy right handed neutrinos, we postulate a new texture for Dirac mass matrix . This model implies one massless light neutr…
Low scale gravity mediation with warped extra dimension and collider phenomenology on the hidden sector
Hideo Itoh, Nobuchika Okada, Toshifumi Yamashita
We propose a scenario of gravity mediated supersymmetry breaking (gravity mediation) in a supersymmetric Randall-Sundrum model. In our setup, both of the visible sector and the hid…
D-term Contributions to the Mixed Modulus-Anomaly Mediated Supersymmetry Breaking
Takeshi Fukuyama, Tatsuru Kikuchi, Nobuchika Okada
We investigate effects of D-term contributions to the mixed modulus-anomaly mediated supersymmetry breaking scenario. In the original scenario, the tachyonic slepton problem in the…
Split-SUSY versus SUSY GUTS
Naoyuki Haba, Nobuchika Okada
The gauge coupling unification is one of main motivations in the split-SUSY scenario, and the existence of the grand unified theories (GUTs) is assumed. We examine how to realize s…
Cosmic Positron Signature from Dark Matter in the Littlest Higgs Model with T-parity
Masaki Asano, Shigeki Matsumoto, Nobuchika Okada +1
We calculate the flux of cosmic positrons from the dark matter annihilation in the littlest Higgs model with T-parity. The dark matter annihilates mainly into weak gauge bosons in…
New contribution to dimension five operators on proton decay in anomaly mediation scenario
Naoyuki Haba, Nobuchika Okada
In supergravity, effective superpotential relevant to dimension five operators on proton decay processes also leads to supersymmetry breaking terms among sfermions, dimension four…