Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Angular Correlations and Light Gluinos in Multi-jet Photoproduction at
  HERA   A study of $3+1$ jet event photoproduction at HERA is presented. We define an
angular variable which is sensitive to the topology of the final state jets and
is therefore able to discriminate between the different contributing
subprocesses, and between QCD and an abelian gluon model. We also investigate
the contribution from the direct production of light gluinos to the $3+1$ cross
section.

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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: dg-ga
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int