Gauge Independence of the S-Matrix in the Causal Approach
Andreas Aste, Michael D"utsch, G"unter Scharf
Abstract
The gauge dependence of the time-ordered products for Yang-Mills theories is analysed in perturbation theory by means of the causal method of Epstein and Glaser together with perturbative gauge invariance. This approach allows a simple inductive proof of the gauge independence of the physical S-matrix.
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