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We show analytically that the slope of the dual or output trajectories is equal to the input slope for the partial-wave projections of the Regge amplitude. This result is independent of the special kinematics, and seems not to require a crossing-symmetric amplitude. We find an infinite set of secondary trajectories, and show that their spacing depends on the slope and approaches Δs=2α^' GeV² for large s. The detailed high-energy structure of some Argand diagrams is shown.
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Joshi et al. (1969) studied this question.
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