Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Q Qbar g contribution to diffractive J/psi electroproduction   We study the diffractive electroproduction of quarkonia from
quark-antiquark-gluon states in the photon wave function. We show that these
states contribute to the leading-power and leading-logarithm level. We suggest
the measurement of J/psi production via inelastic diffraction to study
color-transparency and color-opacity effects in the diffractive gluon
distribution.

18
The categories of this paper are: econ
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol