Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-05-28
Mod.Phys.Lett.A24:1087-1101,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
Invited Brief Review for Modern Physics Letters A, 17 pages
Scientific paper
10.1142/S0217732309031041
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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