Pure annihilation type D→PP(V) decays in the perturbative QCD approach

The annihilation type diagrams are difcult to calculate in any kind of model or method.Encouraged by the successful calculation of pure annihilation type B decays in the perturbative QCD factorization approach,we calculate the pure annihilation type D→PP(V) decays in the perturbative QCD approach based on the kT factorization.Although the expansion parameter 1/mD is not very small,our leading order numerical results agree with the existing experimental data for most channels.We expect more accurate observation from experiments,which can help us learn about the dynamics of D meson weak decays.