Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bottom production cross section from double muonic decays of b-hadrons
  in 920 GeV proton-nucleus collision   The b-bbar production cross section in 920 GeV proton-nucleus fixed target
collisions is measured by observing double muonic decays of b-flavored hadrons
in the kinematic region $-0.3<\xF(\mu)<0.15$.
  A total number of $76\pm12$ b-bbar events is obtained with a likelihood fit
of the signal and background simulated events to the data.
  The resulting cross section is $\sigbb = 16.2 \pm 2.5_{stat} \pm 2.8_{sys}
\nbpn$, or, when combined with a previous Hera-B measurement of similar
precision, $\sigbb = 15.4 \pm 1.7_{stat} \pm 1.2_{sys}^{uncorr.} \pm
1.9_{sys}^{corr.} \nbpn$, which is consistent with recent NLO calculations.

29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
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The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph