A QFT calculation yields an effective axial-vector diquark propagator with a sign opposite to meson exchange, giving a repulsive nucleon-quark potential.
Mandl, Introduction to Quantum Field Theory , Interscience Publishers Ltd., London (1961), chapters 6 a nd 8
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Nucleon-Quark Diquark-exchange Interaction
A QFT calculation yields an effective axial-vector diquark propagator with a sign opposite to meson exchange, giving a repulsive nucleon-quark potential.