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On the Methods for Constructing Meson-Baryon Reaction Models within Relativistic Quantum Field Theory

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Within the relativistic quantum field theory, we analyze the differences between the πN reaction models constructed from using (1) three-dimensional reductions of the Bethe-Salpeter Equation, (2) the method of unitary transformation, and (3) time-ordered perturbation theory. Their relations with the approach based on the dispersion relations of S-matrix theory are dicusssed.

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