For weak decays B_d⁰\rightarrow \pi \pi and K\overline {K} the effects of SU(3) breaking in coupled-channel final-state interaction effects are discussed in a Regge framework. It is shown that SU(3) breaking in the inelastic final-state transitions dramatically affects the phases of the isospin I=0,1,2 amplitudes in the B_d⁰ decays. The effect of the singlet penguin diagram on these phases is studied. Furthermore, on the example of the B_d⁰\rightarrow \pi \pi decays, the dependence of CP asymmetries on the size of penguin amplitude is analyzed.

PACS numbers: 13.25.Hw, 11.30.Hv, 11.80.Gw, 12.15.Hh