2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45910We discuss the role of nonfactorized contributions in $B \rightarrow ψ+ {K}^{*} $ and charmed meson decays. We demonstrate, using $ {D}^{+}_{S} \rightarrow ϕπ$ as a model, how nonfactorization, annihilation and final state interactions can be built into effective and unitarized $ {a}_{1} $ and $ {a}_{2} $.10 pages. latex, 3 uuencoded figures appendedHigh Energy Physics - Phenomenologytext