TL;DR
This paper reviews recent experimental progress in understanding the proton spin puzzle, highlighting new measurements of polarized partons and their implications for QCD's complex vacuum structure.
Contribution
It summarizes recent data on polarized gluons, valence, and sea quark polarizations, providing insights into the proton's internal spin structure and the ongoing challenges in resolving the puzzle.
Findings
New measurements of polarized gluons and sea quarks
Evidence of complex interplay between valence quarks and QCD vacuum
Progress towards understanding the proton spin composition
Abstract
The proton spin puzzle has challenged our understanding of QCD for the last 20 years. New measurements of polarized glue, valence and sea quark polarization, including strange quark polarization, are available. What is new and exciting in the data, and what might this tell us about the structure of the proton ? The proton spin puzzle seems to be telling us about the interplay of valence quarks with the complex vacuum structure of QCD.
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