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Particles and Fields

Eur. Phys. J. C 21, 175-179 (2001)
DOI: 10.1007/s100520100709

On the gauge independence of the S-matrix

W. Kummer

Institut für Theoretische Physik, Technische Universität Wien, Wiedner Hauptstrasse 8-10, 1040 Wien, Austria


(Received: 27 April 2001 / Published online: 6 July 2001 -© Springer-Verlag / Società Italiana di Fisica 2001 )

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.

© Società Italiana di Fisica, Springer-Verlag 2001