We develop the mathematical apparatus necessary to isolate pure naturality contributions from the helicity amplitudes for an arbitrary 2→2 scattering process (with a Bosonic t channel). We prove that certain combinations of the amplitudes and their (multiple) energy‐derivatives suffice, and that no simpler methods exist. For high spin processes, where our methods might be overcomplicated, we develop a simple and accurate approximation using just a single energy‐derivative.

1.
e.g., NN→NN amplitude analysis project (Argonne) reported by A. Yokosawa ANL‐HEP‐PR‐CP‐47 (1977);
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R. Stacey, Z. Phys. (1979) (to be published).
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5.
ξ = ηCηA(−)SA+SC, where the η are intrinsic parities.
6.
The F(P) clearly depend on the helicities. For simplicity we have not made this explicit. The same goes for A(p),B(p),f±, and G± in this section.
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M.
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R. Stacey, “Naturality isolation for 0−N→1+N+N” (preprint 1979).
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© 1981 American Institute of Physics.
1981
American Institute of Physics
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