NONLEPTONIC DECAYS OF CHARMED AND BEAUTIFUL PARTICLES

By fitting simultaneously the values of ζ-1/Nc and αs(mc2) on the inclusive rates of the Cabibbo allowed decays D, F→PP and D→PV, which are independent of the final state interactions, we find ζ=0 and αs(mc2)=0.44. This value for ζ is the same found by other authors [1, 4]. In order to explain the rescattering of the final states produced in the non-leptonic decays of charmed D-particles and to make theoretical predictions for all the exclusive channels, we propose a rescattering model based on the production of resonances in SU(3)-symmetry. In the PP sector we predict a new multiplet of meson resonances 0+ which allows us, with few free parameters, to obtain a satisfactory agreement between theoretical predictions and experimental data. Unfortunately, such an agreement cannot be obtained in the PV sector, for which the presence of other rescattering effects is needed to balance the exotic channel D+→PV. In the PV sector we do not use any free parameter. Finally, we also make predictions for the Cabibbo allowed decay channels B→PP, PV, without considering in this case the final state interactions, because of the high energy of the decay products. © 1990 Springer-Verlag.