Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pure annihilation type $ D\to PP(V)$ decays in the perturbative QCD
  approach   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.

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The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
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The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph