Dictionary

J/psi particle

noun \ˌjā-ˈsī-, -ˈpsī-\

Definition of J/PSI PARTICLE

:  an unstable neutral fundamental particle of the meson group that has a mass about 6000 times the mass of an electron —called also J particle, J/psi, psi particle
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First Known Use of J/PSI PARTICLE

1977

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