# Polarized parton distributions from NLO QCD analysis of world DIS and SIDIS data

## TL;DR

This paper performs a next-to-leading order QCD analysis of world polarized DIS and SIDIS data to derive new polarized parton distribution functions, emphasizing the impact of recent SIDIS data on sea quark polarization.

## Contribution

It introduces a new parametrization of polarized PDFs and assesses uncertainties using a modified Hessian method, focusing on sea and strange quark polarization symmetry.

## Key findings

- New polarized PDFs with quantified uncertainties
- Significant impact of SIDIS data on light sea and strange quark polarization
- Insights into polarized sea symmetry compared to recent results

## Abstract

The combined analysis of polarized DIS and SIDIS data is performed in NLO QCD. The new parametrization on polarized PDFs is constructed. The uncertainties on PDFs and their first moments are estimated applying the modified Hessian method. The especial attention is paid to the impact of novel SIDIS data on the polarized distributions of light sea and strange quarks. In particular, the important question of polarized sea symmetry is studied in comparison with the latest results on this subject.