Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Studies of polarized parton distributions at RHIC   We discuss our studies of polarized parton distributions which are related to
the RHIC-Spin project. First, the parametrization of unpolarized parton
distributions is explained as an introduction to general audience. Second,
activities of the RHIC-Spin-J working group are reported. In particular,
preliminary results are shown on the parametrization of polarized parton
distributions. Third, we discuss numerical solution of the DGLAP Q^2 evolution
equations for longitudinally polarized and transversity distributions. An
efficient and accurate computer program is important for analyzing future RHIC
experimental data.

16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph