Final-state interactions in B → Dρ and B → D*π decays

In this talk, I report on a recent work by G. Nardulli and myself on final-state interaction effects in B → Dρ and B → D*π decays using the Regge model. We find that, due to the smallness of the contributions from the non-leading Regge trajectories (ρ, f, π etc.), final-state interaction phases are small if the Pomeron coupling to the charm quark is suppressed in comparison to lighter quarks. Our conclusion is that for B decays into states containing charm, final-state interaction effects should play a minor role. Infact we find that the decay rates obtained are very close to the rates without final-state interactions. This suggests that in B decays there might be non-factorization contributions. (orig.)