Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for the Rare Decays $J/\psi \to D_{S}^{-} \pi^{+}$, $J/\psi \to
  D^{-} \pi^{+}$, and $J/\psi \to \bar D^{0} \bar K^{0}$   Rare decay modes $J/\psi \to D_{S}^{-} \pi^{+} + c.c.$, $J/\psi \to D^{-}
\pi^{+} + c.c.$, and $J/\psi \to \bar D^{0} \bar K^{0} + c.c.$ are searched for
using 5.77$\times 10^{7}$ $J/\psi$ events collected with the BESII detector at
the BEPC. No signal above background is observed. We present upper limits on
the branching fractions $B(J/\psi \to D_{S}^{-} \pi^{+})$ $<$
1.4$\times10^{-4}$, $B(J/\psi \to D^{-} \pi^{+})$ $<7.5\times10^{-5}$, and
$B(J/\psi \to \bar D^{0} \bar K^{0})$ $<$ 1.7$\times10^{-4}$ at the 90%
confidence level.

4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc