Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Conatraints on $\Delta G$ from Prompt Photon plus Jet Production at
  HERA-$\vec{N}$   The utility of prompt photon plus associated jet production for constraining
the size and shape of the polarized gluon density of the proton $\Delta G$ is
examined at $\sqrt{S}=40$ GeV, appropriate for the proposed HERA-$\vec{N}$
polarized $\vec{p}\vec{p}$ collider experiment. The calculation is performed at
next-to-leading order (O($\alpha\alpha_s^2$)) in QCD. The reliability of the
predictions are examined in some detail.

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The categories of this paper are: gr-qc
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The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: ao-sci
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The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: physics
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th