A General Expression for Symmetry Factors of Feynman Diagrams

Abstract

The calculation of the symmetry factor corresponding to a given Feynman diagram is well known to be a tedious problem. We have derived a simple formula for these symmetry factors. Our formula works for any diagram in scalar theory (${\varphi }^3$ and ${\varphi }^4$ interactions), spinor QED, scalar QED, or QCD.

RevTex 11 pages with 10 figures

References in corpus (1)

• Recursive Graphical Construction of Feynman Diagrams and Their Multiplicities in phi^4- and in phi^2A-Theory

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