Hadronic correction to Coulomb potential between quarks and diquark structure

Mie have studied the hadronic correction from the background pion fields due to the chiral symmetry breaking to the Coulomb potential that governs the short-distance behavior of the interactions between the bound quarks. The background fields are associated with the constituent quark mass. We find a modified potential form which favors the diquark structure. We also roughly estimate an influence of this correction on the phase shifts in nucleon-nucleon scattering and find that it may cause an extra middle range attraction between nucleons which is expected.