FINAL-STATE INTERACTIONS IN B-]D-RHO AND B-]D-ASTERISK-PI DECAYS

In this talk, I report on a recent work by G. Nardulli and myself on f inal-state interaction effects in B --> D rho and B --> Dpi decays us ing the Regge model. We find that, due to the smallness of the contrib utions from the non-leading Regge trajectories (rho, f, pi etc.), fina l-state interaction phases are small if the Pomeron coupling to the ch arm quark is suppressed in comparison to lighter quarks. Our conclusio n is that for B decays into states containing charm, final-state inter action effects should play a minor role. Infact we find that the decay rates obtained are very close to the rates without final-state intera ctions. This suggests that in B decays there might be non-factorizatio n contributions.