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本文利用核子与反核子散射振幅的解析性和么正性导出单个虚介子的格林函数。在计算中不需要进行重正化手续The Green's function of a single π-meson is obtained by the method of dispersion telation utilizing the analytic and unitary properties of the nucleon-antinucleon scattering amplitude. No renormalization procedure is needed.
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