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Results tagged with feynman-diagrams
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user 150191
A diagrammatic technique introduced by Richard Feynman to describe the quantum behaviour of subatomic particles and their interactions. Do not use for general questions on diagrams that are not of the Feynman kind.
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$\phi^{4}$ theory Feynman rules
One of the momentum space Feynman rules in $\phi^{4}$ theory (for correlation functions) is that for an external point with 4-momentum $p$ (with direction headed towards the external point), we need a …
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Computing S-Matrix Elements from Feynman Diagrams
In Peskin and Schroeder (PS), the Feynman rules for calculating correlation functions are first presented. Only terms involving all field contractions need to be considered.
In Section 4.6, this is t …
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LSZ Reduction Formula
In Section 3.7.2 of Tong's QFT notes the LSZ reduction formula is briefly discussed.
Essentially, this tells us that for S-matrix elements we can use the same momentum space Feynman rules as for corr …
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