Physics Asked on May 16, 2021
In papers they often say things about the analytic structure of S matrices – things like resonances are poles on the unphysical sheet, particle channels cause a square root branch cut etc.
I’ve seen this demonstrated in a couple of simple cases but I was wondering if there was any book/notes where this is talked about in general?
In general analyticity is consequence of causality and unitarity. A classic text is Eden, Landshoff and Polkinghorne The analytic S-Matrix. It focusses on $S$-matrix elements, but discusses the analytic properties of individual Feynman diagrams.
Answered by mike stone on May 16, 2021
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