Pure annihilation type $ D\to PP(V)$ decays in the perturbative QCD approach

TL;DR

This paper calculates pure annihilation D meson decays into pseudoscalar and vector mesons using perturbative QCD, providing results that align with experimental data and offering insights into D meson decay dynamics.

Contribution

First application of perturbative QCD to compute pure annihilation D decays, extending the approach used for B decays to charm mesons.

Findings

Numerical results agree with experimental data for most channels.

The approach offers a new way to study D meson decay mechanisms.

Supports the validity of perturbative QCD in charm sector calculations.

Abstract

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