Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic effects in the production of pseudoscalar and vector doubly
  heavy mesons from e^+e^- annihilation   On the basis of the perturbative QCD and the relativistic quark model we
investigate the relativistic and bound state effects in the production
processes of a pair of $S$-wave doubly heavy mesons with opposite charge
conjugation consisting of $b$ and $c$ quarks. All possible relativistic
corrections in the production amplitude including the terms connected with the
transformation law of the bound state wave function to the reference frame of
the moving pseudoscalar ${\cal P}-$ and vector ${\cal V}-$ mesons are taken
into account. We obtain a growth of the cross section for the reaction
$e^++e^-\to J/\Psi+ \eta_c$ due to considered effects by a factor $2\div 2.5$
in the range of the center-of-mass energy $\sqrt{s}=6\div 12$ GeV.

17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph