Diquark

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)^[1]. 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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References and Additional Reading

• [1] Lichtenberg DB, Namgung W, Predazzi E, Wills JG, Baryon Masses In A Relativistic Quark-Diquark Model, Physical Review Letters 48 (24): 1653-1656 1982
• Rapp R, Schafer T, Shuryak E, et al. Diquark bose condensates in high density matter and instantons Physical Review Letters 81 (1): 53-56 JUL 6 1998