J/psi meson
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The
J/ψ
meson is a subatomic particle, a flavor-neutral meson consisting of a charm quark and a charm antiquark. Mesons formed by a bound state of a charm quark and a charm anti-quark are generally known as "charmonium" or psions. Wikipedia
Antiparticle: self
Composition: c; c
Decays into: 3; g; or; γ; +2; g; or; γ;
Decay width: 92.9 keV
Discovered: SLAC: Burton Richter et al. (1974); BNL: Samuel Ting et al. (1974)
Electric charge: 0 e
Family: meson