Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hadronic returns to the Z in electron-positron annihilation at high
  energy   The production of four hadronic jets in e+e- collisions above the Z pole is
dominated by the QCD e+e- --> qqqq,qqgg processes and, for sufficiently high
energy, the electroweak e+e- --> W+W- --> qqqq process. However there is
another mechanism for producing four jets, e+e- --> Z gg --> qqgg, which can be
regarded as a `hadronic return' to the Z pole. We investigate this new process
in detail

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The categories of this paper are: supr-con
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The categories of this paper are: adap-org
2
The categories of this paper are: math
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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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: math-ph
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: comp-gas