Commensurate Scale Relations in Quantum Chromodynamics

Details Commensurate Scale Relations in Quantum Chromodynamics Commensurate Scale Relations in Quantum Chromodynamics

1994-05-04

arxiv.org/abs/hep-ph/9405218v1

Phys.Rev.D51:3652-3668,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

35 pages (RevTeX), one PostScript figure included at the end. SLAC-PUB-6481, UMD Preprint #94-135

Scientific paper

10.1103/PhysRevD.51.3652

We use the BLM method to show that perturbatively-calculable observables in QCD can be related to each other without renormalization scale or scheme ambiguity. We define and study the commensurate scale relations. We show that the commensurate scales satisfy the renormalization group transitivity rule which ensures that predictions in PQCD are independent of the choice of an intermediate renormalization scheme. We generalize the BLM procedure to higher order. The application of this procedure to relate known physical observables in QCD gives surprisingly simple results. In particular, the annihilation ratio $R_{e^+e^-}$ and the Bjorken sum rule for polarized electroproduction are related through simple coefficients, which reinforces the idea of a hidden symmetry between these two observables.

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