Status of Longitudinal Polarized Parton Densities and Higher Twist
Elliot Leader, Alexander V. Sidorov, Dimiter B. Stamenov
TL;DR
This paper reviews the current understanding of longitudinal polarized parton densities, emphasizing the impact of higher twist effects and the uncertainties in polarized strange quark and gluon densities on nucleon spin studies.
Contribution
It provides an updated analysis of polarized PDFs, highlighting the significance of higher twist effects and the challenges in accurately determining strange quark and gluon contributions.
Findings
Higher twist effects influence polarized PDF extraction.
Polarized strange quark and gluon densities remain poorly constrained.
The nucleon spin decomposition continues to have significant uncertainties.
Abstract
The present status of the longitudinal polarized parton densities (PDFs) and the contribution of their first moments to the nucleon spin is discussed. Special attention is paid to the role of higher twist effects in determining the PDFs and to the polarized strange quark and gluon densities, which are still not well determined from the present data.
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