Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The cross section of the process $e^{+}+e^{-}\to J/\psi+\eta_c$ within
  the QCD light-cone sum rules   We calculate the cross section of the exclusive process $e^{+} +e^{-}\to
J/\psi+\eta_c$ at the leading order approximation within the QCD light-cone sum
rules (LCSR) approach. It is found that the form factor
$F_{VP}(V=J/\psi,P=\eta_c)$ depends mainly on the behavior of the twist-2
distribution amplitude of the $\eta_c$-meson at the scale of this process. Thus
in order to obtain a reliable estimation of the cross section, it is important
to have a realistic distribution amplitude of the $\eta_c$ meson, and to deal
with the evolution of the distribution amplitude to the effective energy scale
of the process. Our results show that one can obtain a compatible prediction
with the Belle and BarBar experimental data.

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The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an
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The categories of this paper are: q-alg
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The categories of this paper are: q-bio
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The categories of this paper are: astro-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: adap-org
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The categories of this paper are: stat
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
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The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: cs