Using lattice QCD, the scalar diquark mass is found to be close to (2/3) of the nucleon mass, and the quark-diquark potential is of Cornell type with string tension agreeing to within 5% of the static quark-antiquark potential.
Shuryak, The role of instantons in quantum chromo- dynamics, Nuclear Physics B 203 (1) (1982) 93–115
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Scalar diquark mass and quark--diquark potential from lattice QCD using the potential method with a static quark
Using lattice QCD, the scalar diquark mass is found to be close to (2/3) of the nucleon mass, and the quark-diquark potential is of Cornell type with string tension agreeing to within 5% of the static quark-antiquark potential.