Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Role of Incident Parton Transverse Momenta in Heavy Quark
  Hadroproduction   The conventional NLO parton model is enough for the description of total
cross sections and one-particle distributions. In the case of two-particle
correlations, the collinear approximation has failed, and it is necessary to
account for the transverse momenta of initial partons. The different
possibilities to do this are discussed.

1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci