Fixing the renormalization scheme in NNLO perturbative QCD using conformal limit arguments

Research output: Contribution to journalArticle


We discuss how the renormalization scheme ambiguities in QCD can be fixed, when two observables are related, by requiring the coefficients in the perturbative expansion relating the two observables to have their conformal limit values, i.e., to be independent of the [Formula presented] function of the renormalized coupling. We show how the next-to-leading order BLM automatic scale-fixing method can be extended to next-to-next-to-leading order to fix both the renormalization scale and [Formula presented] in a unique way. As an example we apply the method to the relation between Bjorken's sum rule and [Formula presented] and compare with experimental data as well as other scheme-fixing methods.


External organisations
  • Uppsala University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Pages (from-to)3420-3426
Number of pages7
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number5
Publication statusPublished - 1996 Sep 1
Publication categoryResearch
Externally publishedYes