SINCE 1828
J/psi particle
noun
\ˌjā-ˈsī-,
-ˈpsī-\
-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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