Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the Top Quark Pair Production Cross Section in pbarp
  Collisions   We present a measurement of the ttbar production cross section in ppbar
collisions at root(s) = 1.8TeV by the D0 experiment at the Fermilab Tevatron.
The measurement is based on data from an integrated luminosity of approximately
125 pb^-1 accumulated during the 1992-1996 collider run. We observe 39 ttbar
candidate events in the dilepton and lepton+jets decay channels with an
expected background of 13.7+-2.2 events. For a top quark mass of 173.3GeV/c^2,
we measure the ttbar production cross section to be 5.5+-1.8 pb.

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The categories of this paper are: econ
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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th