Helicity Poles, Triple-Regge Behavior, and Single-Particle Spectra in High-Energy Collisions

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Abstract
Following Mueller, we relate, through a generalized optical theorem, the single-particle production spectrum to a discontinuity in a six-line amplitude. Assuming only analyticity of the six-line amplitude in its angular momenta, we obtain a general expression for the behavior of the production spectrum near the phase-space boundary. To study the asymptotic limit appropriate to this region, we make use of analytic continuation to complex helicities.