The idea that all strongly interacting particles are nonelementary in the technical sense of not being associated with quantized wave fields is a very attractive one. The possibility of associating such particles with trajectories of so-called Regge poles of the S matrix regarded as an analytic function of a complex angular momentum has been widely discussed.(1-4) Unfortunately, it has not yet been possible to establish theoretically any of the "desired" properties of Regge trajectories in a relativistic theory.
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Blankenbecler et al. (1962) studied this question.
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