Abstract
We perform a new extraction of polarized parton distribution functions (PPDFs) from the spin structure function experimental data in the fixed-flavor number scheme (FFNS). In this analysis, we include recent proton and deuteron spin structure functions obtained by the \texttt{COMPASS} collaboration. We examine the impact of the \texttt{new COMPASS} proton and deuteron data on the polarized parton densities and compare with results from our previous study (KATAO PPDFs), which used the Jacobi polynomial approach. We find the extracted PPDFs of the proton, neutron, and deuteron structure functions are in very good agreement with the experimental data. The results for extracted PPDFs are also compared with available theoretical models from the literature.
Highlights
One of the principal goals of quantum chromodynamics (QCD) has been the detailed investigation of the spin structure of the nucleon and nuclei, as well as the determination of the partonic composition of their spin projections
The extraction of polarized or spin-dependent parton distribution functions has been recognized as a longstanding issue of physical interest [1,2], and theoretical studies on the spin structure of the nucleon have been discussed extensively in several reviews [3,4,5,6,7]
Determinations of polarized parton distribution functions (PPDFs) with an estimate of their uncertainties have been presented in multiple studies [8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43]
Summary
One of the principal goals of quantum chromodynamics (QCD) has been the detailed investigation of the spin structure of the nucleon and nuclei, as well as the determination of the partonic composition of their spin projections. Determinations of polarized parton distribution functions (PPDFs) with an estimate of their uncertainties have been presented in multiple studies [8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43] The variation among these PPDF sets can be due to a number of factors, including the choice of experimental data sets and the form of the parametrization and uncertainty calculation, as well as the details of the QCD analysis such as the treatment of heavy quarks or higher-twist corrections.
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