Based on symmetry consideration, more generalized chiral field terms are proposed to restore the chiral SU(2)L×{}SU(2)R symmetry of strong interaction. As a result, a modified quark-quark interaction is obtained. Applying this interaction to nucleon-nucleon scattering, the agreement between the theoretical phase shifts of partial waves and experimental data is improved.
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Yu et al. (1995) studied this question.
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