Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the cross section for production of b b-bar X, decaying
  to muons in pp collisions at sqrt(s)=7 TeV   A measurement of the inclusive cross section for the process pp to b b-bar X
to muon muon X' at sqrt(s) = 7 TeV is presented, based on a data sample
corresponding to an integrated luminosity of 27.9 inverse picobarns collected
by the CMS experiment at the LHC. By selecting pairs of muons each with
pseudorapidity abs(eta)<2.1, the value of the cross section for pp to b b-bar X
to muon muon X' is found to be 26.4 +/- 0.1 (stat.) +/- 2.4 (syst.) +/- 1.1
(lumi.) nb is obtained for muons with transverse momentum greater than 4 GeV,
and 5.12 +/- 0.03 (stat.) +/- 0.48 (syst.) +/- 0.20 (lumi.) nb for transverse
momenta greater than 6 GeV. These results are compared to QCD predictions at
leading and next-to-leading orders.

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The categories of this paper are: astro-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: math
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: stat
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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: econ
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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: q-fin