Renormalization-Scheme-Independent Perturbation Theory by Resumming   Logarithms
  Results of perturbation theory in quantum field theory generally depend on the renormalization scheme that is in use. In particular, they depend on the scale. We try to make perturbation theory scheme invariant by re-expanding with respect to a scheme invariant quantity. Furthermore, we investigate whether the potentially large logarithms in such an expansion cause inaccuracy and how this can be improved. 
Chris Dams, Ronald Kleiss