Impact of recent COMPASS data on polarized parton distributions and structure functions

TL;DR

This paper updates polarized parton distribution functions using recent COMPASS data, showing improved agreement with experimental results and comparing with previous models and analyses.

Contribution

It introduces a new extraction of PPDFs incorporating recent COMPASS data within the FFNS framework, enhancing the understanding of polarized structure functions.

Findings

PPDFs agree well with recent experimental data

Inclusion of COMPASS data refines polarized parton densities

Comparison with theoretical models shows good consistency

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.