Decay Modes
The hadronic decay modes of the J/ψ are strongly suppressed because of the OZI Rule. This effect strongly increases the lifetime of the particle and thereby gives it its very narrow decay width of just 93.2±2.1 keV. Because of this strong suppression electromagnetic decays begin to compete with hadronic decays. This is why the J/ψ has a significant branching fraction to leptons.
Read more about this topic: J/psi Meson
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