Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Way to Measure Polarized Gluon Distributions   Effects of the spin-dependent gluon distributions on J/$\psi$ productions in
polarized ep and pp collisions are investigated. These productions serve as a
very clean probe of the spin-dependent gluon distributions in a proton.

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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
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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: plasm-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: math