A class of models describing the collision of Regge poles and their associated Mandelstam branch cuts is described, from which one concludes that Regge trajectories generally develop left-hand branch cuts as a result of such collisions, and in terms of which the singularities in the l plane of the partial-wave amplitude and the asymptotic behavior of the scattering amplitude can be discussed.
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Kaus et al. (1970) studied this question.
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