A QFT calculation yields an effective axial-vector diquark propagator with a sign opposite to meson exchange, giving a repulsive nucleon-quark potential.
(C27) In momentum space the propagator leads to the integral ~I5(k;m) = ∫ d4p (2π)4 ∫ d4q (2π)4 (2π)4δ4(p +q −k) [ −p ·q +m2] × [ p2 −m2 +iǫ ] −1[ q2 −m2 +iǫ ] −1
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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.