Gauge independence of the S-matrix in the causal approach

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, , Citation Andreas Aste et al 1998 J. Phys. A: Math. Gen. 31 1563 DOI 10.1088/0305-4470/31/6/008

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1 Institut für Theoretische Physik der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland

2 Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany

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  1. Received 14 October 1997

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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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