Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Improved measurement of the branching ratio of J/psi-->K_S K_L   The branching ratio of J/psi-->K_S K_L is measured with improved precision to
be B(J/psi-->K_S K_L) = (1.82\pm 0.04\pm 0.13)\times 10^{-4}. using J/psi data
collected with the Beijing Spectrometer (BESII) at the Beijing
Electron-Positron Collider. This result is used to test the perturbative QCD
``12%'' rule between psi(2S) and J/psi decays and to investigate the relative
phase between the three-gluon and one-photon annihilation amplitudes in J/psi
decays.

27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th