Status and Developments in Polarised Parton Distribution Functions

TL;DR

This paper reviews recent progress in polarized parton distribution functions, emphasizing the importance of accurate PDFs for upcoming Electron-Ion Collider experiments and comparing different PDF sets.

Contribution

It provides a review of the MAPPDFpol1.0 set and compares various NLO PDF sets, highlighting the impact of methodological choices on differences.

Findings

Differences between PDF sets often exceed those due to perturbative order.

Methodological choices significantly influence PDF determinations.

Accurate polarized PDFs are essential for future collider experiments.

Abstract

The need for accurate and precise polarised parton distribution functions (PDFs) is becoming increasingly crucial in view of the Electron-Ion Collider experimental program foreseen in the coming years. Two global PDF determinations at next-to-next-to-leading order accuracy have been recently presented, MAPPDFpol1.0 and BDSSV24. I review the former and I provide a comparative discussion of other PDF sets accurate to next-to-leading order. I show that differences between these PDF sets, due to the choice of experimental and methodological input, exceed differences due to perturbative accuracy.