Improved measurement of the branching ratio of J/psi-->K_S K_L

Details Improved measurement of the branching ratio of J/psi-->K_S K_L Improved measurement of the branching ratio of J/psi-->K_S K_L

2003-10-13

arxiv.org/abs/hep-ex/0310023v1

Phys.Rev.D69:012003,2004

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 14 figures, 2 tables, submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.69.012003

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.

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