Abstract

Mass differences of particles produced in high-energy collisions lead to dynamical thresholds in unitarity integrals for two-body scattering. These thresholds are understood as being responsible for the rapid energy dependence of exotic-exchange and Zweig-rule-violating amplitudes. Processes involving twisted intermediate states, and consequently cancellations, in the unitarity sum are expected to be particularly sensitive to these thresholds. In the J-plane, the corresponding amplitudes are characterized by a weak leading singularity accompanied by strong non-leading effective singularities associated with threshold effects. The requirement that states of even and odd C-conjugation be produced with equal strength in order to keep exotic amplitudes small at high energies can also be relaxed as a consequence of the said threshold phenomena. The SU(3) structure of exotic states generated by multiperipheral duality diagrams is also discussed.

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