The NLO DGLAP extraction of alpha_s and higher twist terms from CCFR xF_3 and F_2 structure functions data: results and scale dependence

TL;DR

This paper performs a detailed NLO analysis of CCFR structure function data to extract alpha_s and higher-twist terms, revealing a larger alpha_s value with scale dependence considerations.

Contribution

It introduces a model-independent parameterization of higher-twist contributions and studies their scale dependence within a comprehensive NLO DGLAP analysis.

Findings

Extracted alpha_s(M_Z)=0.1222 with uncertainties

Found larger central value and errors than previous CCFR results

Analyzed the scale dependence of higher-twist terms

Abstract

We perform a detailed NLO analysis of the combined CCFR xF_3 and F_2 structure functions data and extract the value of alpha_s, parameters of distributions and higher-twist (HT) terms using a direct solution of the DGLAP equation. The value of alpha_s(M_Z)=0.1222\pm 0.0048 (exp) \pm 0.0026 (theor) is obtained. Our results has a larger central value and errors than the original one of the CCFR collaboration due to model independent parameterization of the HT contributions. The dependence of HT contributions on the QCD renormalization scale is studied.