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The branching ratio of J/psi-->K_S K_L is measured with improved precision tobe B(J/psi-->K_S K_L) = (1.82\pm 0.04\pm 0.13)\times 10^{-4}. using J/psi datacollected with the Beijing Spectrometer (BESII) at the BeijingElectron-Positron Collider. This result is used to test the perturbative QCD``12%'' rule between psi(2S) and J/psi decays and to investigate the relativephase between the three-gluon and one-photon annihilation amplitudes in J/psidecays.Comment: 10 pages, 14 figures, 2 tables, submitted to Phys. Rev.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

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Improved measurement of the branching ratio ofJ/ψ→KS0<…