The quantum theory of scattering is considerably simplified if we suppose, as was done by Lehmann, Symanzik and Zimmermann, that there is a correspondence between particles and fields. A scheme of this sort, which is a special case of the Wightman approach, is called the LSZ (Lehmann-Symanzik-Zimmermann) formalism. An essential element of it is the notion of chronological products and Green’s functions, which we now set forth.
KeywordsVelocity Space Formal Series Mass Shell Negative Power Fermionic Field
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