267 citations · 1.1k across the 29 of their papers we have counts for
6 papers · 2 filters
Dark Matter before the LHC in a Natural Supersymmetric Standard Model
Ryuichiro Kitano, Yasunori Nomura
We show that the solid lower bound of about 10^{-44} cm^2 is obtained for the cross section between the supersymmetric dark matter and nucleon in a theory in which the supersymmetr…
A Solution to the Supersymmetric Fine-Tuning Problem within the MSSM
Ryuichiro Kitano, Yasunori Nomura
Weak scale supersymmetry has a generic problem of fine-tuning in reproducing the correct scale for electroweak symmetry breaking. The problem is particularly severe in the minimal…
Natural soft leptogenesis
Yuval Grossman, Ryuichiro Kitano, Hitoshi Murayama
Successful soft leptogenesis requires small B-terms for the right-handed sneutrinos and a large CP violating phase between the A- and B-terms. We show that this situation is realiz…
Grand Unification, Dark Matter, Baryon Asymmetry, and the Small Scale Structure of the Universe
Ryuichiro Kitano, Ian Low
We consider a minimal grand unified model where the dark matter arises from non-thermal decays of a messenger particle in the TeV range. The messenger particle compensates for the…
Models of Neutrino Mass with a Low Cutoff Scale
Hooman Davoudiasl, Ryuichiro Kitano, Graham D. Kribs +1
In theories with a low quantum gravity scale, global symmetries are expected to be violated, inducing excessive proton decay or large Majorana neutrino masses. The simplest cure is…
Tripletless unification in the conformal window
Ryuichiro Kitano, Graham D. Kribs
A product SU(5)xSp(4) grand unified model is proposed with no fundamental Higgs fields transforming under SU(5). Higgs doublets are instead embedded into a four dimensional represe…