Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Signals for Double Parton Scattering at the Fermilab Tevatron   Four double-parton scattering processes are examined at the Fermilab Tevatron
energy. With optimized kinematical cuts and realistic parton level simulation
for both signals and backgrounds, we find large samples of four-jet and
three-jet+one-photon events with signal to background ratio being 20\%-30\%,
and much cleaner signals from two-jet+two-photon and two-jet+$e^+e^-$ final
states. The last channel may provide the first unambiguous observation of
multiple parton interactions, even with the existing data sample accumulated by
the Tevatron collider experiments.

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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys