Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New Results on Vector Meson Production at HERA   New results on elastic (exclusive) production of vector mesons are presented,
mainly on J/\psi and phi mesons with emphasis on an interpretation of the data
within pQCD.

25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an