A recursive framework built on the optical theorem and a doubled-field action computes differential cross-sections directly, reproducing known tree-level 2 to 2 and 2 to 4 phi^4 results.
Feenberg, The Scattering of Slow Electrons by Neutral Atoms , Phys
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Recursion for Differential Cross-Section from the Optical Theorem
A recursive framework built on the optical theorem and a doubled-field action computes differential cross-sections directly, reproducing known tree-level 2 to 2 and 2 to 4 phi^4 results.