Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Double handbag description of proton-antiproton annihilation into a
  heavy meson pair   We propose to describe the process $ p \bar{p} \,\to\, \bar{D^0} D^0$ in a
perturbative QCD motivated framework where a double-handbag hard process $ u d
\bar u \bar d \to \bar{c} c$ factorizes from transition distribution
amplitudes, which are quasi forward hadronic matrix elements of $\Psi_q \Psi_q
\Psi_c $ operators, where q denotes light quarks and c denotes the heavy quark.
We advocate that the charm-quark mass acts as the large scale allowing this
factorization. We calculate this process in the simplified framework of the
scalar diquark model and present the expected cross sections for the PANDA
experiment at GSI-FAIR.

16
The categories of this paper are: stat
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an