On the Anomalous Threshold and Composite Particles

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Abstract
Using the equal time Bethe-Salpeter amplitude, we show that the form factor of the charge distribution of composite particles and its threshold are closely related to those given by the phenomenological quantum field theory. When the Bethe-Salpeter amplitude describes a bound states, its normalization condition can be used to determine the effective coupling constants of interactions between the composite particle and its constituents. In this way, we can derive a relation among the effective coupling constants, having no detailed information on the force binding the constituent particles. To examine this relation in experiments gives us a way for judging if the particles are composite or not.

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