Meson
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In particle physics, a meson is a type of hadronic subatomic particle composed of an equal number of quarks and antiquarks, usually one of each, bound together by the strong interaction. Wikipedia
Composition: composite: quarks and antiquarks
Discovered: 1947
Electric charge: −1 e, 0 e, +1 e
Family: hadron
Interactions: strong, weak, electromagnetic and gravity
Mass: from 134.9 MeV/c2 (; π0;); to 9.460 GeV/c2 (; ϒ;)
Spin: 0 ħ, 1 ħ