Geodesic
Four-loop verification of an algorithm for summing Feynman diagrams in
Teoretičeskaâ i matematičeskaâ fizika, Tome 147 (2006) no. 2, pp. 290-302 Cet article a éte moissonné depuis la source Math-Net.Ru

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By calculating some four-loop diagrams in the $N{=}1$ supersymmetric electrodynamics regularized by higher derivatives, we verify a method for summing Feynman diagrams based on using Schwinger–Dyson equations and Ward identities. In particular, for the diagrams considered, we prove the correctness of an additional identity for Green's functions not reduced to the gauge Ward identity.
Keywords: supersymmetry, Ward identity, higher covariant derivatives. 
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A. B. Pimenov; K. V. Stepanyantz. Four-loop verification of an algorithm for summing Feynman diagrams in. Teoretičeskaâ i matematičeskaâ fizika, Tome 147 (2006) no. 2, pp. 290-302. http://geodesic.mathdoc.fr/item/TMF_2006_147_2_a5/

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