Gauge dependence of Green’s functions in QCD and QED

@article{Nishijima2007GaugeDO,
  title={Gauge dependence of Green’s functions in QCD and QED},
  author={Kazuhiko Nishijima and Anca Tureanu},
  journal={The European Physical Journal C},
  year={2007},
  volume={53},
  pages={649-657}
}
When all Green’s functions are known in a given gauge we may raise the question of whether it is possible or not to derive the corresponding ones in a different gauge. The answer is negative in QCD but affirmative in QED provided that we confine ourselves to the covariant gauge characterized by a gauge parameter α. We shall discuss the physical significance of this conclusion. 

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