Two-Loop Diagrams in Causal Perturbation
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Andreas Aste
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Article
π
1997
π
Elsevier Science
π
English
β 521 KB
Scalar two-loop diagrams are calculated analytically in massive cases needed for the computation of boson and fermion propagators in QED and QCD by the causal method of Epstein and Glaser. It is demonstrated that this method, which is the basis for the so-called dispersive methods, provides many adv