Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin Physics at RHIC   The physics goals that will be addressed by colliding polarized protons at
the Relativistic Heavy Ion Collider (RHIC) are described. The RHIC spin program
provides a new generation of experiments that will unfold the quark, anti-quark
and gluon contributions to the proton's spin. In addition to these longer term
goals, this paper describes what was learned from the first polarized proton
collisions at $\sqrt{s}$=200 GeV. These collisions took place in a five-week
run during the second year of RHIC operation.

36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
2
The categories of this paper are: math
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs