Quarkonium
In particle physics, quarkonium (pl. quarkonia) is a flavorless meson whose constituents are a heavy quark and its own antiquark, making it a neutral particle and the antiparticle of itself.
In particle physics, quarkonium (pl. quarkonia) is a flavorless meson whose constituents are a heavy quark and its own antiquark, making it a neutral particle and the antiparticle of itself.