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Results tagged with feynman-diagrams
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user 51870
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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Symmetry factor of $n$-point one-loop diagram
Cheng and Li's appendix gives the generic symmetry factor $S^{-1}$ with
$$S=g\prod_{n\geq 2}2^{\beta}(n!)^{\alpha_n},$$
where $\alpha_n$ are the number of pairs of vertices connected by $n$ identical …
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