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In quark-diquark models, a diquark, or diquark correlation/clustering, is an hypothetical state of two quarks grouped inside a baryon (that consists of three quarks). The diquark is often treated as a single particle with which the third quark interacts via the strong interaction. The existence of diquarks inside the nucleons is a disputed issue, but it helps to understand some nucleon properties and to reproduce experimental data sensitive to the nucleon structure. Diquark-antidiquark pairs have also been advanced for anomalous particles such as the X(3872).
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|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Diquark". A list of authors is available in Wikipedia.|