Abstract
By taking into account the analytic structure of the λ plane of the direct channel in the framework of various models and approaches, one can obtain an explicit expression for the scattering amplitude in different kinematic regions, and it is not necessary to require a small parameter. The choice of the functional dependence of the bare amplitude on λ, which is determined by the form of the hadron potential, generates a specific analytic structure of the complex λ plane and, thus, permits conclusions to be drawn about the shape of the hadron potential.
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