psi|||PRIMARY_STRESS||| particle
Scientific
/ sī′prīm′,psī′- /
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An electrically neutral meson having a mass 7,213 times that of the electron and a mean lifetime of approximately 1 × 10 - 20 seconds, composed, like the J/psi particle, of a charm-anticharm quark pair.
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See Table at subatomic particle
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