Article révisé par les pairs
Résumé : We investigate the pattern of CP violation in K0-K0̄, B0d-B0d and B0s-B0s̄ mixing in a symmetrical SU(2)L × SU(2)R × U(1) model with spontaneous CP violation. From a set of fixed quark masses and mixings, we calculate the phases of the left and right quark mixing matrices beyond the small phase approximation and perform a careful analysis of all relevant restrictions on the model's parameters from △mK, △mB, ∈, ∈′/∈ and the CP asymmetry aCP in B0d → J/ψK0S. Of 64 possible sets of phases, most are excluded because they imply opposite signs for Re ∈ and aCP. For the one remaining set, aCP is predicted to be small (≤ 0.1) for the chosen input quark masses and mixings. Barring an instability with respect to these input values, the model is thus soon to be critically tested at B factories. The mass of the right-handed charged gauge boson, M2, is restricted to be in the range 2.75 to 13 TeV, and the mass of the flavour-changing neutral Higgs bosons, MH, in 10.2 to 14.6 TeV. This means in particular that the decoupling limit M2,MH → ∞ is already excluded by experiment. © 2000 Elsevier Science B.V. All rights reserved.