Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Calculation of the cross section for the pion diffractive dissociation
  into two jets   Contribution of the gluon distribution in the nucleon to the cross section
for the pion diffractive dissociation into two jets has been calculated
recently. In addition, we present here calculation of contribution of the quark
distributions to this process.
  It is expected usually that the quark contributions are much smaller than the
gluon one at high energies. We show that, under the conditions of the E791
experiment, the quark contributions are as significant as the gluon one, so
that the total cross section exceeds several times those with only gluon
contribution.
  Nevertheless, the distribution of jets in longitudinal momentum fractions
does not change significantly and remains qualitatively the same. We compare
our results with the data from the E791 experiment.

36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn