2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41036Resonance-mediated many body decays of heavy mesons are analyzed. We focus on some particular processes, in which the available phase space for the decay of the intermediate resonance is very narrow. It is shown that the mass selection criteria used in several experimental studies of D and B meson decays could lead to a significant underestimation of branching ratios.9 pages, 1 figureHigh Energy Physics - Phenomenologytext