Deviation pattern approach for optimizing perturbative terms of QCD renormalization group invariant observables

TL;DR

This paper introduces the deviation pattern approach (DPA) to improve the estimation of higher-order perturbative terms in QCD observables, enhancing the accuracy of renormalization group-based predictions.

Contribution

The paper develops the deviation pattern approach (DPA) for refining RG-induced estimates of higher-order QCD corrections, validated through applications to sum rules and the Adler function.

Findings

DPA improves estimates of $ ext{alpha}_s^4$ corrections.

Application to Bjorken sum rule yields consistent results.

Application to Adler function provides new perturbative estimates.

Abstract

We first consider the idea of renormalization group-induced estimates, in the context of optimization procedures, for the Brodsky-Lepage-Mackenzie approach to generate higher-order contributions to QCD perturbative series. Secondly, we develop the deviation pattern approach (DPA) in which through a series of comparisons between lower-order RG-induced estimates and the corresponding analytical calculations, one could modify higher-order RG-induced estimates. Finally, using the normal estimation procedure and DPA, we get estimates of $\alpha_s^4$ corrections for the Bjorken sum rule of polarized deep-inelastic scattering and for the non-singlet contribution to the Adler function.