The Spin Structure of the Nucleon
Christine A. Aidala, Steven D. Bass, Delia Hasch, Gerhard K. Mallot
TL;DR
This paper reviews current understanding and experimental progress in QCD spin physics, focusing on the proton spin puzzle and the nucleon's transverse structure, highlighting open questions and future challenges.
Contribution
It synthesizes recent experimental and theoretical developments in nucleon spin structure and discusses open questions in QCD spin physics.
Findings
Experimental investigations have advanced understanding of nucleon spin components.
Theoretical models are being refined to interpret spin measurements.
Open questions remain about the detailed transverse structure of the nucleon.
Abstract
This article reviews our present understanding of QCD spin physics: the proton spin puzzle and new developments aimed at understanding the transverse structure of the nucleon. We discuss present experimental investigations of the nucleon's internal spin structure, the theoretical interpretation of the different measurements and the open questions and challenges for future investigation.
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