Perturbative thresholds in the physical region
Departamento de Física Aplicada, CINVESTAV-IPN, Apdo. Postal 73 “Cordernex”, 97310, Mérida, Yucatán, México
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Published online: 16 September 2013
We consider unstable-particle scattering in the context of 3-body processes. We show that all partial-wave cross-sections are finite and positive, and the total cross-section is proportional to the transverse size of space in the region of on-shell particle exchange. We comment on the role of loop corrections.
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