Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the Cross Section for open b-Quark Production in
  Two-Photon Interactions at LEP   Inclusive beauty-quark production in two-photon collisions has been measured
at LEP using an integrated luminosity of 698 pb-1 collected by the ALEPH
detector with sqrt(s) between 130 and 209 GeV. The b quarks were identified
using lifetime information. The cross section is found to be sigma(e+ e- --> e+
e- b \bar{b} X) = (5.4 +/- 0.8 (stat) +/- 0.8 (syst)) pb which is consistent
with Next-to-Leading Order QCD.

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The categories of this paper are: math
26
The categories of this paper are: bayes-an
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The categories of this paper are: cs
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat