Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Next-to-leading order QCD corrections for the charmonium production via
  the channel $e^+ e^- \to H(|c\bar{c}\rangle) + \gamma$ round the $Z^0$ peak   In our previous work [2], it has been found that sizable charmonium events
via the channel $e^+e^- \to \gamma^*/Z^0 \to H(|c\bar{c}\rangle) +\gamma$ can
be produced at the suggested super $Z$ factory, where $H(|c\bar{c}\rangle)$
represents the dominant color-singlet $S$-wave and $P$-wave charmonium states
$J/\psi$, $\eta_c$, $h_c$ and $\chi_{cJ}$ ($J=0, 1, 2$), respectively. As an
important step forward, in the present paper, we present a next-to-leading
order (NLO) QCD analysis within the framework of nonrelativistic QCD. In
different to the case of $B$ factory in which the single charmonium production
is dominated by the channel via a virtual photon, at the super $Z$ factory, its
cross-section is dominated by the channel via a $Z^0$ boson. Estimations up to
NLO level are done at both the $B$ factory and the super $Z$ factory
experimental conditions. We observe that the NLO distributions have the same
shapes as those of LO distributions, but their differences are sizable. This
indicates that a NLO calculation is necessary and important to achieve a more
accurate estimation. Due to $Z^0$ boson resonance effect, at the super $Z$
factory with a high luminosity up to $10^{36}{\rm cm}^{-2}{\rm s}^{-1}$, when
summing all the color-singlet states' contribution together, one may observe
about $8.0\times10^{4}$ charmonium events via the channel $e^+e^-\to Z^0 \to
H(|c\bar{c}\rangle)+\gamma$ in one operation year. Then, such super $Z$ factory
could provide another useful platform to study the charmonium properties, even
for the higher charmonium states.

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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
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The categories of this paper are: cs
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The categories of this paper are: nucl-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th