TL;DR
This paper proves that the S-matrix remains invariant under gauge parameter changes without requiring renormalizability, using a nonperturbative approach and the extended BRS transformation.
Contribution
It demonstrates gauge-parameter independence of the S-matrix in a nonperturbative manner without assuming renormalizability, via the extended BRS transformation.
Findings
S-matrix invariance under gauge parameter variation
Gauge-parameter independence proven nonperturbatively
Uses extended BRS transformation for proof
Abstract
The S-matrix is invariant with respect to the variation of any (global) parameter involved in the gauge fixing conditions, if that variation is accompanied by a certain redefinition of the basis of polarization vectors. Renormalizability of the underlying gauge theory is not required. The proof is nonperturbative and, using the `extended' BRS transformation, quite simple.
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