Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quarkonium Polarization in Non-relativistic QCD and the Quark-Gluon
  Plasma   We examine angular distributions of leptons arising from the decay of J/psi
in inclusive hadroproduction. Taking into account feed-down contributions from
chi_{1,2}, a flat distribution emerges without fine tuning parameters. Changes
in the ratio of direct to total J/psi cross sections would change this
distribution significantly. Such angular distributions are, therefore,
confirmatory tests of the J/psi suppression signal for the production of a
quark-gluon plasma. Related effects are predicted for the Upsilon.

2
The categories of this paper are: math
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc