Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Perturbative QCD analysis of exclusive J/\psi+\eta_c production in
  e^+e^- annihilation   We analyze the exclusive charmonium $J/\psi+\eta_c$ pair production in
$e^+e^-$ annihilation using the nonfactorized perturbative QCD and the
light-front quark model(LFQM) that goes beyond the peaking approximation. We
effectively include all orders of higher twist terms in the leading order of
QCD coupling constant and compare our nonfactorized analysis with the usual
factorized analysis in the calculation of the cross section. We also calculate
the quark distribution amplitudes, the Gegenbauer moments, and the decay
constants for $J/\psi$ and $\eta_c$ mesons using our LFQM. Our nonfactorized
result enhances the NRQCD result by a factor of $3\sim4$ at $\sqrt{s}=10.6$
GeV.

17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th