Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exclusive $J/\psi$ production at the LHC in the $k_T$ factorization
  approach   The recent LHCb data for exclusive $J/\psi$ peripheral production at 13 TeV
motivate an improved `NLO' analysis to estimate the gluon distribution at low
$x$ in which we re-calculate the rapidity gap survival factors and use a more
precise expression for the photon flux. We comment on the difference between
the $k_T$ and collinear factorization approaches.

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The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: nlin
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The categories of this paper are: supr-con
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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: math
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: cs
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph