Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reconciling the light-cone and nonrelativistic QCD approaches to
  calculating e+ e- -> J/psi + eta_c   It has been suggested in Ref. [A. E. Bondar and V. L. Chernyak, Phys. Lett. B
612, 215 (2005)] that the disagreement between theoretical calculations and
experimental observations for the rate for the process e+ e- -> J/psi + eta_c
at the B factories might be resolved by using the light-cone method to take
into account the relative momentum of the heavy-quark and antiquark in the
quarkonia. The light-cone result for the production cross section in Ref. [A.
E. Bondar and V. L. Chernyak, Phys. Lett. B 612, 215 (2005)] is almost an order
of magnitude larger than existing NRQCD factorization results. We investigate
this apparent theoretical discrepancy. We compute light-cone distribution
functions by making use of quarkonium wave functions from the Cornell potential
model. Our light-cone distribution functions are similar in shape to those of
Ref. [A. E. Bondar and V. L. Chernyak, Phys. Lett. B 612, 215 (2005)] and yield
a similar cross section. However, when we subtract parts of the light-cone
distribution functions that correspond to corrections of relative-order alpha_s
in the NRQCD approach, we find that the cross section decreases by about a
factor of three. When we set certain renormalization factors Z_i in the
light-cone calculation equal to unity, we find a further reduction in the cross
section of about a factor of two. The resulting light-cone cross section is
similar in magnitude to the NRQCD factorization cross sections and shows only a
modest enhancement over the light-cone cross section in which the relative
momentum of the heavy-quark and antiquark is neglected.

27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph