Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photoproduction of Jets and Heavy Flavors in Polarized ep - Collisions
  at HERA   We study photoproduction of jets and heavy flavors in a polarized collider
mode of HERA at $\sqrt{S}= 298$ GeV. We examine the sensitivity of the cross
sections and their asymmetries to the proton's polarized gluon distribution and
to the completely unknown parton distributions of longitudinally polarized
photons.

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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: nucl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys