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arxiv: hep-th/0006021 · v1 · submitted 2000-06-02 · ✦ hep-th

Extended BRS Symmetry and Gauge Independence in On-Shell Renormalization Schemes

classification ✦ hep-th
keywords renormalizationgaugeindependenceon-shellschemesconditionextendednecessary
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Extended BRS symmetry is used to prove gauge independence of the fermion renormalization constant $Z_2$ in on-shell QED renormalization schemes. A necessary condition for gauge independence of $Z_2$ 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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