Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Resummation of relativistic corrections to exclusive productions of
  charmonia in e+ e- collisions   We investigate two exclusive processes, e+ e- -> eta_c + gamma and e+ e- ->
J/psi + J/psi, at the center-of-momentum energy sqrt{s}=10.58 GeV within the
framework of the nonrelativistic QCD factorization approach. A class of
relativistic corrections is resummed to all orders in the heavy-quark velocity
v and the corrections are large negative. We further improve the prediction by
including available QCD next-to-leading-order corrections and the interference
between the QCD and relativistic corrections. The prediction for sigma[e+ e- ->
eta_c + gamma] is about 50 fb. In the case of e+ e- -> J/psi + J/psi the
standard nonrelativistic QCD prediction for the cross section is negative. As
an alternative, the vector-meson-dominance approach is employed to compute the
photon-fragmentation contribution of the process, which gives the cross section
~1 fb. This is an indication that the uncalculated QCD higher-order corrections
may be significant. Our results can be tested against the forthcoming data from
Belle II and super B factories.

22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph