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The nonleptonic two body decays $D\to PP$ and $D\to PV$ are investigatedbased on the diagrammatic decomposition in a generalized factorizationformalism. It is shown that to fit the experimental data, the SU(3) flavorsymmetry breaking effects of the coefficients $a_i$s should be considered in$D\to PP$ decay modes. In $D\to PV$ decays, the final state hadron structuredue to the pseudoscalar and vector mesons has more important effects on thecoefficients $a_i$s than the SU(3) symmetry breaking effects. It is found thatthe nonfactorizable contributions as well as that of the exchange andannihilation diagrams are significant in these decays.Comment: 20 pages, 6 tables, to appear in Eur.Phys.J.

Exploring final state hadron structure and SU(3) flavor symmetry breaking effects in $D\to PP$ and $D\to PV$ decays