| Abstrakt: |
This article introduces AAK24, a Next-to-Leading Order QCD analysis of polarized data from both polarized Deep Inelastic Scattering (DIS) and Semi-Inclusive Deep Inelastic Scattering (SIDIS) experiments on the nucleon. The AAK24 QCD analysis incorporates SU(2) and SU(3) symmetry breaking, specifically δ u ¯ ≠ δ d ¯ ≠ δ s ¯ , while assuming δ s ¯ and δ s are equal. Emphasizing the significance of the semi-inclusive data, the study explores the determination of polarized sea-quark distributions. Recent experimental data from JLAB17, COMPASS16, and COMPASS17, including the A 2 asymmetry measurements along with SIDIS observables, are thoroughly examined for their impact on the central values of polarized PDFs, their uncertainties, and overall fit quality. Additionally, we include the non-perturbative target mass corrections as well as higher-twist terms (HT) which are particularly important. In this work, the uncertainties are quantified using the standard Hessian method. The main results and findings of the AAK24 QCD analysis show overall good agreement with the analyzed experimental data, aligning well with other polarized PDF determinations, particularly DSSV14, LSS10, JAM17, and AKS14, all considering SU(2) and SU(3) symmetry breaking. [ABSTRACT FROM AUTHOR] |
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