Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Light Quark Spectroscopy Results from FOCUS and E687   Using the FOCUS spectrometer (experiments 687 and 831 at Fermilab) we confirm
the existence of a diffractively photoproduced enhancement in $K^+K^- $ at 1750
\mevcc with nearly 100 times the statistics of previous experiments.
  We also observe a narrow dip structure at 1.9 GeV/c$^2$ in a study of
diffractive photoproduction of the $3\pi^+3\pi^-$ final state.

2
The categories of this paper are: math
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph