antidiquark
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Diquark — In quark–diquark models, a diquark, or diquark correlation/clustering, is the hypothetical state of two quarks grouped inside a baryon (that consists of three quarks) (Lichtenberg 1982). The diquark is often treated as a single particle with… … Wikipedia
X(3872) — The X(3872) is an anomalous particle which does not fit into the quark model because of its quantum numbers. It was discovered by the Belle experiment in Japan and later confirmed by several other experimental collaborations. Several theories… … Wikipedia
baryonium — noun A particle like resonance composed of a diquark and an antidiquark … Wiktionary
