Renormalization Scheme Dependence and the Problem of Theoretical Uncertainties in Next-Next-to-Leading Order QCD Predictions
| Autor: | Piotr A. Raczka |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1994 |
| Předmět: |
Quantum chromodynamics
Physics Particle physics Physics and Astronomy (miscellaneous) High Energy Physics::Lattice High Energy Physics::Phenomenology FOS: Physical sciences Order (ring theory) Perturbative QCD Expression (computer science) Renormalization High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) Scheme (mathematics) Sum rule in quantum mechanics Statistical physics Invariant (mathematics) Engineering (miscellaneous) |
| Popis: | Renormalization scheme uncertainties in the next-next-to-leading order QCD predictions are discussed. To obtain an estimate of these uncertainties it is proposed to compare predictions in all schemes that do not have unnaturally large expansion coefficients. A concrete prescription for eliminating the unnatural schemes is given, based on the requirement that large cancellations in the expression for the characteristic renormalization scheme invariant should be avoided. As an example the QCD corrections to the Bjorken sum rule are considered. The importance of the next-next-to-leading order corrections for a proper evaluation of perturbative QCD predictions is emphasized. 15 pages, 3 figures,LateX |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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