Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Higher Orders in the Colour-Octet Model of J/\psi Production   We study the hadro- and photo-production of $\bar cc$ and $\bar bb$ mesons at
low transverse momentum to high orders in the relative velocity of the pair, v,
in non-relativistic QCD. We evaluate cross sections to order v^7 for $\eta_c$,
sufficient for studies of photo-production in the almost-elastic region. For
all other charmonium states we find the cross section to order v^9, sufficient
for studies of the ratio of $\chi_{c1}$ and $\chi_{c2}$ production rates. We
find recurrence formulae for generating terms at even higher orders, should
they be needed.

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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: econ
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: astro-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: cs