It is established with almost complete generality by means of the perturbation-theoretical integral representation that the high-energy behavior of the exact scattering amplitude for spinless particles is closely related to the continued partial-wave Bethe-Salpeter equation, namely, the latter determines the generalized Regge trajectory equation. The Regge behavior is derived for the exact scattering amplitude of two identical neutral spinless particles.
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Noboru Nakanishi (1964) studied this question.
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