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The Optical theorem: P&S section 7.3 [closed]
I'm studying about the optical theorem in QFT with P&S textbook. I was trying to find the discontinuity of $\mathcal{M}(s)$ in $\phi^4$- theory (p.233). More specifically, I was calculating the ...
1vote
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Does vacuum expectation values of field operators contain all the information of the quantum field theory?
It is a very general question in the field theory context. It means whether anything that we can compute with a canonically quantized Hamilton, can be computed from the generating functional with an ...
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4votes
0answers
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Analytic continuation of $\mathcal{M}$ in Peskin and Schroeder QFT book
In Peskin and Schroeder QFT book on page 232 they define $\mathcal{M}(s)$, the $S$-matrix element, to be defined by the Feynman rules, where $s=E^2_{cm}$ can have complex values. Let $s_0$ be the ...
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