Nonleptonic weak decays of charmed mesons

A previous analysis of two-body Cabibbo-allowed nonleptonic decays of ${\mathit{D}}^0$ mesons and of Cabibbo-allowed and first-forbidden decays of ${\mathit{D}}^{+}$ and ${\mathit{D}}_{\mathit{s}}^{+}$ has been adjourned using more recent experimental data and extended to the Cabibbo-forbidden decays of ${\mathit{D}}^0$. Annihilation and W-exchange contributions as well as final state interaction effects (assumed to be dominated by nearby resonances) have been included and are in fact crucial to obtain a reasonable agreement with the experimental data, which show large flavor SU(3) violations. New fitting parameters are necessary to describe rescattering effects for Cabibbo-forbidden ${\mathit{D}}^0$ decays, given the lack of experimental information on isoscalar resonances. We keep their number to a minimum, three, using phenomenologically based considerations. We also discuss CP-violating asymmetries.