Anatomy of mixing-induced CP asymmetries in left-right symmetric models with spontaneous CP violation
We investigate the pattern of CP violation in K0- K 0¯, B0d- B 0d¯ and B0s- B 0s¯ 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 ΔmK, ΔmB, ɛ, ɛ'/ ɛ 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 ɛ 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.