Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Double-Spin Asymmetry of J/psi Production in Polarized pp Collisions at
  HERA-$\vec N$   We calculated the color-octet contribution to the double spin asymmetry of
$J/\psi$ hadroproduction with nonzero transverse momenta at fixed target
energies $\sqrt{s}\simeq40$ GeV. It is shown that the color-octet contribution
is dominant in the asymmetries. The expected asymmetries and statistical errors
in a future option of HERA with longitudinally polarized protons at HERA-$\vec
N$ should allow one to distinguish between different parametrizations for the
polarized gluon distribution in the proton.

33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th