Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detect \Delta G at BNL-RHIC via Double Quarkonium Production   The double spin asymmetry for exclusive $J/\psi$ pair production in the
polarized $p-p$ collisions at RHIC is investigated. Our study shows that the
asymmetry in this process is measurable at RHIC-SPIN experiments in the near
future, and, hence it can be used to determine the gluon distribution function
$\Delta G (x)$ in the polarized nucleon.

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The categories of this paper are: math-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
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The categories of this paper are: funct-an