On the Invariance of Residues of Feynman Graphs

Details On the Invariance of Residues of Feynman Graphs On the Invariance of Residues of Feynman Graphs

2001-11-21

arxiv.org/abs/hep-th/0111192v2

J.Math.Phys. 43 (2002) 4721-4740

Physics

High Energy Physics

High Energy Physics - Theory

24 pages, latex generated figures. Minor changes in revised version

Scientific paper

10.1063/1.1502926

We use simple iterated one-loop graphs in massless Yukawa theory and QED to pose the following question: what are the symmetries of the residues of a graph under a permutation of places to insert subdivergences. The investigation confirms partial invariance of the residue under such permutations: the highest weight transcendental is invariant under such a permutation. For QED this result is gauge invariant, ie the permutation invariance holds for any gauge. Computations are done making use of the Hopf algebra structure of graphs and employing GiNaC to automate the calculations.

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