523In order to obtain the experimental values of the left-hand-cut contributions in the partial wave dispersion relation for nucleon-nucleon scattering, we calculated the right-hand-cut contributions ,from the experimental data following Kantor's procedure using the results of phase shift' analyses of nucleon-nucleon scattering in both elastic and inelastic regions. ~ I. IntroductionIt is well known that essential features of the nucleon-nucleon interaction below 310 Me V is well reproduced by the one-boson-exchange model (hereafter OBE model).1) On the other hand, the analyses of nucleon-nucleon interaction by the more orthodox field theoretic approach taking one-, two-, ... pion exchanges have been extensively made and the correlation between these two approaches has gradually been clarified. 2 ) In the analyses by the OBE model several methods have been used to calculate the scattering amplitudes which satisfy the unitarity conditions such as the K-matrix method, non-relativistic Schrodinger equation and dispersion relation. The K-matrix method has its characteristic in its simplicity, while the Schrodinger equation and dispersion relation involves the rescattering effects through virtual states which is usually ignored in the K-matrix approach. Each of these methods has its own merit and demerit. Among them, however, the dispersion t'heoretical approach seems to become most important and appropriate as the energy goes higher.The failure of the simple K-matrix model and the necessity of the physical effect corresponding to the right-hand-cut contributions in tpe OBE model are suggested from the analysis of the S waves.In a typical analysis of nucleon-nucleon scattering in terms of dispersion relation, some appro2timation is usually made for the left-hand-cut contributions
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