Renormalization of QCD Coupling Constant in Terms of Physical Quantities

TL;DR

This paper proposes a new renormalization scheme for QCD where parameters are expressed via gauge-invariant, infrared-stable quantities, revealing confinement phenomena within perturbation theory.

Contribution

It introduces a scheme using the quark anomalous electromagnetic moment for coupling renormalization, calculated at two loops, highlighting confinement effects.

Findings

Confinement phenomena observed in perturbation theory

Renormalization scheme based on gauge-invariant quantities

Two-loop calculation of quark anomalous electromagnetic moment

Abstract

A renormalization scheme is suggested where QCD input parameters - quark mass and coupling constant - are expressed in terms of gauge invariant and infrared stable quantities. For the renormalization of coupling constant the quark anomalous electromagnetic moment is used; the latter is calculated in a two loop approximation. Examination of the renormalized S matrix indicated confinement phenomenon already in the framework of perturbation theory.