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Quarkonium
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<p>In <a href="/facts/Particle_physics/YgIuyj2t">particle physics</a>, quarkonium (from <a href="/facts/Quark/hwuuVkV5">quark</a> and -<a href="/facts/Onium/85uteEFR">onium</a>, pl. quarkonia) is a <a href="/facts/Flavor_(physics)/RR7rsuTD">flavorless</a> <a href="/facts/Meson/9R0kIc1q">meson</a> whose constituents are a heavy <a href="/facts/Quark/hwuuVkV5">quark</a> and its own <a href="/facts/Antiquark/hwuuVkV5">antiquark</a>, making it both a <a href="/facts/Neutral_particle/pQbmxaaE">neutral particle</a> and its own <a href="/facts/Antiparticle/7Ic43ThI">antiparticle</a>. The name "quarkonium" is analogous to <a href="/facts/Positronium/F35JBo9C">positronium</a>, the bound state of <a href="/facts/Electron/L0KBo5cW">electron</a> and <a href="/facts/Positron/HgV4zBzA">anti-electron</a>. The particles are short-lived due to matter-antimatter <a href="/facts/Annihilation/tm55RWnf">annihilation</a>. </p>