Extended BRS Symmetry and Gauge Independence in On-Shell Renormalization Schemes
S. Alavian, T. G. Steele
Abstract
Extended BRS symmetry is used to prove gauge independence of the fermion renormalization constant Z2 in on-shell QED renormalization schemes. A necessary condition for gauge independence of Z2 in on-shell QCD renormalization schemes is formulated. Satisfying this necessary condition appears to be problematic at the three-loop level in QCD.
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