TL;DR
This paper reviews recent theoretical and experimental progress on the proton spin puzzle, highlighting the complex interplay of valence quarks, chiral dynamics, and QCD vacuum structure in understanding proton spin.
Contribution
It provides a comprehensive survey of new developments in theory and experiment addressing the longstanding proton spin puzzle.
Findings
Insights into valence quark contributions to proton spin
Role of chiral dynamics in spin structure
Impact of QCD vacuum structure on spin understanding
Abstract
The proton spin puzzle has challenged our understanding of QCD for the last 20 years. We survey new developments in theory and experiment. The proton spin puzzle seems to be telling us about the interplay of valence quarks with chiral dynamics and the complex vacuum structure of QCD.
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