Takemi HAYASHI

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The effect of the ”chromo-electric” dipole moment on the electric dipole moment(EDM) of the neutron is studied in the two-Higgs-doublet model. The Weinberg’s operator O3g = GGG̃ and the operator Oqg = qσG̃q are both investigated in the cases of tan β ≫ 1, tanβ ≪ 1 and tanβ ≃ 1. The neutron EDM is considerably reduced due to the destructive contribution with(More)
We give the detailed analyses for the gluonic-penguin effect on the Kπ and ππ decays of the B meson. In the standard model, it is shown that the ratio BR(B → Kπ)/BR(B → ππ) takes the value 0.5 ∼ 3.0 with the strongly depending on the CP violating phase φ and the KM matrix element |Vub|. We obtain the constraint on the form factor by using the experimental(More)
We introduce the flavor symmetry ZM ×ZN ×D4 into the SU(6)×SU(2)R string-inspired model. The cyclic group ZM and the dihedral group D4 are R symmetries, while ZN is a non-R symmetry. By imposing the anomaly-free conditions on the model, we obtain a viable solution under many phenomenological constraints coming from the particle spectra. For the neutrino(More)
We study the electric dipole moments(EDM) of the neutron and the electron in the two-Higgs-doublet model, in the case that CP symmetry is violated maximally in the neutral Higgs sector. We take account of the Weinberg’s operator O3g = GGG̃ as well as the operator Oqg = qσG̃q for the neutron, and the Barr-Zee diagrams for the electron. It is found that the(More)
The decay B .... Xsy is analysed with the non·standard physical effects due to the charged Riggs contribution in the two·Riggs·doublet model. The hard Y emission of B·meson, being induced at one·loop level, is an important process to search for the non·standard contributions in the low energy region. It is shown that the charged Riggs contribution can(More)
We systematically analyse the gluonic penguin-induced charmless decays B → KXφ(KX denotes the meson state sq (q = u or d) ), in the standard model and the two-Higgsdoublet model. These processes, being induced at one-loop level, are of great importance in measuring the virtual top quark effect in the standard model, and also in searching for the(More)
We study the path from the string scale physics to the low-energy physics in the SU(6)× SU(2)R string-inspired model with the flavor symmetry ZM × ZN × D̃4. The flavor symmetry controls the mass spectra of heavy particles as well as those of quarks and leptons in the intermediate energy region ranging from the string scale (∼ 1018 GeV) to the electroweak(More)
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