Optimized Perturbation Theory

@inproceedings{Stevenson1981OptimizedPT,
  title={Optimized Perturbation Theory},
  author={Paul M. Stevenson},
  year={1981}
}
Conventional perturbation theory gives different results in different renormalization schemes, a problem which is especially serious in quantum chromodynamics (QCD). I propose a theoretical resolution of this ambiguity which uses the full renormalization-group invariance of the theory. The idea is that, in any kind of approximation scheme which does not respect the known invariances of the exact result, the "optimum" approximant is the one that is "most invariant," i.e., least sensitive to… CONTINUE READING

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