Heavy Meson Decay in Three-Mesons and FSI

The final state interaction contribution to charged D decay into K ππ is computed within a light-front framework, considering S -wave Kπ interactions in 1/2 and 3/2 isospin states. The convergence of the rescattering series is checked computing terms up to the third perturbative order. The role of the resonances above K^*_0(1430) , and the contribution of the Kπ 3/2 isospin channel to charged three-body D decays, are studied against the available phase-shift analysis.