J/psi particle (jāʹsīʹ, -psīʹ)
An electrically neutral meson having a mass 7,213 times that of the electron and a mean lifetime of approximately 1 × 10-20 seconds. Also called J particle, psi particle.
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psiparticle — psi particle (sī, psī) n. See J/psi particle. * * * … Universalium