Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charmonium production in e+e- to \psi + X(c\bar c) and e+e- to D*D_J   The dominance of chi_0 in the data for e+e- to psi + chi_J(c\bar{c}) is shown
to violate OZI factorization. Single gluon exchange gives a non-factorizing
effective S.L interaction that generates a large scalar production amplitude.
This also has observable effects near threshold in e+e- to D*D_J, where
enhancements of D*D_0 and DD_1 channels are predicted. Further tests and
implications are discussed.

4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph