Gluon polarization and higher twist effects

TL;DR

This paper reviews recent experimental data on gluon polarization and higher twist effects in nucleons, discussing how future Electron-Ion Collider measurements could clarify the sign of gluon polarization and analyzing recent global fits.

Contribution

It provides an analysis of recent experimental results and theoretical considerations on gluon polarization and higher twist effects, highlighting the potential of EIC to resolve current ambiguities.

Findings

Recent CLAS and COMPASS data impact HT and gluon polarization understanding

EIC can discriminate between negative and positive gluon polarization

Discussion of recent DSSV analysis and higher twist issues

Abstract

We examine the influence of the recent CLAS and COMPASS experiments on our understanding of higher twist (HT) effects and the gluon polarization, and show how EIC could discriminate between negative and positive gluon polarizations. We comment on the issue of HT and the recent DSSV analysis.