Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A study of electron recombination using highly ionizing particles in the
  ArgoNeuT Liquid Argon TPC   Electron recombination in highly ionizing stopping protons and deuterons is
studied in the ArgoNeuT detector. The data are well modeled by either a Birks
model or a modified form of the Box model. The dependence of recombination on
the track angle with respect to the electric field direction is much weaker
than the predictions of the Jaffe columnar theory and by
theoretical-computational simulations.

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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: alg-geom