Bjorken sum rule with analytic coupling at low Q2 values

TL;DR

This paper demonstrates that using an analytic QCD approach without Landau poles provides highly accurate predictions for the polarized Bjorken sum rule at low Q2, aligning well with experimental data and differing from standard QCD results.

Contribution

It introduces an analytic QCD framework up to fifth order that accurately models the Bjorken sum rule at low Q2, avoiding Landau pole issues.

Findings

Excellent agreement between analytic QCD predictions and experimental data.

Significant difference between analytic QCD and standard QCD results.

Validation of analytic QCD as a reliable approach at low Q2.

Abstract

The experimental data obtained for the polarized Bjorken sum rule \Gamma^{(p-n)}_1(Q^2) for small values of Q2 are approximated by the predictions obtained in the framework of analytic QCD up to the 5th order perturbation theory, whose coupling constant does not contain the Landau pole. We found an excellent agreement between the experimental data and the predictions of analytic QCD, as well as a strong difference between these data and the results obtained in the framework of standard QCD.