Kazuhiro Tobe

Learn More
We systematically construct gauge-mediated supersymmetry(SUSY)-breaking models with direct transmission of SUSY-breaking effects to the standard-model sector. We obtain a natural model with the gravitino mass m 3/2 smaller than 1 keV as required from the standard cosmology. If all Yukawa coupling constants are of order one, the SUSY-breaking scale m SU SY(More)
Various lepton-flavor violating (LFV) processes in the supersymmetric standard model with right-handed neutrino supermultiplets are investigated in detail. It is shown that large LFV rates are obtained when tan β is large. In the case where the mixing matrix in the lepton sector has a similar structure as the Kobayashi-Maskawa matrix and the(More)
Web-based malware attacks have become one of the most serious threats that need to be addressed urgently. Several approaches that have attracted attention as promising ways of detecting such malware include employing various blacklists. However, these conventional approaches often fail to detect new attacks owing to the versatility of malicious websites.(More)
In the light of recent experimental data on gaugino searches, we revisit the direct-transmission model of dynamical supersymmery breaking with the gravitino mass m ˜ G ≤ 16 eV, which does not have any cosmological or astrophysical problems. We find that in the consistent regions of parameter space, the model predicts not only upper bounds on superparticle(More)
In the light of the recent muon (g µ − 2) result by the E821 experiment at the Brookhaven National Laboratory, we study the event rates of the charged lepton-flavour-violating (LFV) processes in the supersymmetric standard model (SUSY SM) with the heavy right-handed neutrinos (SUSY seesaw model). Since the left-handed sleptons get the LFV masses via the(More)
Neutrino Oscillations in an SO(10) SUSY GUT with U(2)xU(1) n Family Symmetry Abstract In a previous paper we analyzed fermion masses (focusing on neu-trino masses and mixing angles) in an SO(10) SUSY GUT with U(2)×U(1) n family symmetry. The model is " natural " containing all operators in the Lagrangian consistent with the states and their charges. With(More)