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I'll answer in the most simple way: Quarkonium (like positronium in the electromagnetic case) consists of two anti-particles (like an electron and a positron in positronium). The quarks inside quarkonium are anti-particles of each other. The properties of one quark are opposite (anti) to the properties of the other. Which is to say, the colors and electric ...


Quarkonium states are a type of meson state. There are other meson states, e.g charged mesons.

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