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- Izawa K, Y Nomura, K Tobe, T Yanagida
- 1997

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)

- J. Hisano, T. Moroi, K. Tobe, M. Yamaguchi
- 1995

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)

- Stuart Raby, Kazuhiro Tobe
- 1998

In this paper we study the experimental consequences of a theory which naturally has a heavy, stable (or almost stable) gluino. We define the boundary conditions at a messenger scale M ∼ 10 14 GeV which lead to this alternative phenomenologically acceptable version of the minimal supersymmetric standard model. In this theory, either the gluino or the… (More)

- Daiki Chiba, Kazuhiro Tobe, Tatsuya Mori, Shigeki Goto
- 2012 IEEE/IPSJ 12th International Symposium on…
- 2012

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)

- J Hisano, K Tobe, T Yanagida
- 1996

We point out that if the Peccei-Quinn symmetry breaking scale F a is in a range of the hadronic axion window (F a ∼ 10 6 GeV), the eeγγ + / E T event in the CDF experiment can be naturally explained by a no-scale supergravity model with a light axino. We also stress that the hadronic axion window still survives the intergalactic photon search, since a large… (More)

- Daiki Chiba, Kazuhiro Tobe, Tatsuya Mori, Shigeki Goto
- JIP
- 2013

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)

- Kazuhiro Tobe
- 2003

Motivated in part by recent demonstrations that electroweak gauge coupling unification may occur at a low scale, we analyze the requirements on the Higgs mass if the gauge coupling unification is to be perturbative. We consider an infinite set of possible unification scenarios parametrized by the value of sin 2 θ W at the unification scale Λ, and show the… (More)