Phenomenology of spontaneous CP violation model with neutral flavor conservation

The report addresses an analysis of a spontaneous CP violation model proposed by Ecker, Grimus and Neufield which satisfies neutral flavor conservation in the Higgs sector. Their model has a very interesting Kobayashi-Maskawa matrix which leads to phenomenological results different from standard model. A detailed analysis is made of the phenomenological consequense of this KM matrix, which is explicitly expressed here in a 4 x 4 orthogonal form in the expansion of λ (Cabibbo angle). Wolfenstein type parametrization is derived, and used to analyze ε, ε'/ ε parameters in the K system, B deg - B-bar deg oscillation. Then the CP violation asymmetry in Bdeg meson system is examined. The effects of charged Higgs bosons are neglected in the analysis. However, the calculations would be valid for heavy charged Higgs bosons, and light charged Higgs bosons are excluded by electric dipole moment of neutron to which charged Higgs bosons contribute in the one loop level. It is emphasized that nonleptonic decay CP asymmetry in the tree approximation is independent of decay modes in this model, and this is the feature quite different from standard model. (Nogami, K.)