What question did this study set out to answer?

The aim is to enhance the Feynman-Dyson theory by incorporating composite particle interactions.

Many-body Problem in Quantum Field Theory

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Extends Feynman-Dyson theory to investigate scattering involving composite particles, suggesting new insights into wave functions.

The aim is to enhance the Feynman-Dyson theory by incorporating composite particle interactions.
Extended the Feynman-Dyson theory to include scattering with composite particles.
Clarified the relationship of Salpeter-Bethe wave functions to probability amplitude.
Introduced co- and contravariant components of state vectors in an oblique coordinate system.
Established a clear connection between Salpeter-Bethe wave functions and probability amplitudes.
Demonstrated the effectiveness of the new framework for analyzing scattering processes involving composite particles.

Kazuhiko Nishijima (1953) studied this question.

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