Crewther's relation in different schemes

2023/09/28 by Mason, R. H., Gracey, J. A.
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2309.16554

Abstract

We examine Crewther's relation at high loop order in perturbative QCD and demonstrate how the relation is accommodated in gauge-parameter dependent schemes where the running of the gauge parameter has to be explicitly considered. Motivated by ensuring that the conformal properties of the relation are preserved at all the critical points of QCD, including the Banks-Zaks and its infra-red stable twin, we demonstrate the necessity of an additional term in the relation for describing gauge running in the minimal momentum subtraction scheme (mMOM) and argue for its inclusion for all gauge-parameter dependent schemes.

Related

• The Crewther relation, schemes, gauges and fixed points
• The generalized Crewther relation: the peculiar aspects of the analytical perturbative QCD calculations
• The generalized Crewther relation and V-scheme: analytic O(α⁴_s) results in QCD and QED
• Scheme-Independent Predictions in QCD: Commensurate Scale Relations and Physical Renormalization Schemes
• Scheme and gauge dependence of QCD fixed points at five loops