QCD analysis of polarized DIS and the SIDIS asymmetry world data and light sea-quark decomposition

2013/11/07 by F. Arbabifar, Fatemeh Arbabifar, Ali N. Khorramian +1
Physics and Astronomy · #Asymmetry #Compass #Deep inelastic scattering #Helicity #Hessian matrix #High-Energy Particle Collisions Research #Inelastic scattering #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Parton #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quark #Scattering #hep-ph

paper · pdf · doi:10.1103/physrevd.89.034006

published as Phys. Rev. D 89, 034006 (2014) · 18 pages, 12 figures, 5 tables

arxiv created 2013/11/07 · openalex publication_date 2014/02/07 · arxiv updated 2014/02/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

The results of our new QCD analysis of helicity parton distributions of the nucleon at full next-to-leading order accuracy in the fixed-flavor number scheme are presented. Performing a combined QCD fit on the global sets of latest inclusive and the semi-inclusive polarized deep inelastic scattering data, we are able to extract new polarized parton distribution functions (PPDFs) at the input scale Q₀²=1 GeV². Particularly, we calculate PPDFs considering light sea-quark decomposition, and the results are compared with the experimental data and the most precise theoretical models obtained by recent analyses. The latest COMPASS2010 SIDIS data, which were not used in the combined analyses before 2010, are employed in the current analysis, and the effect of COMPASS SIDIS data is studied in detail. Also, the uncertainties of PPDFs are determined using the standard Hessian technique.

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