STAR's jet, dijet, and pion spin asymmetry measurements, summarized here, support a positive gluon helicity at x above about 0.05 and provide first constraints at x near 10^-3.
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Overview of Gluon Helicity Measurements at STAR
STAR's jet, dijet, and pion spin asymmetry measurements, summarized here, support a positive gluon helicity at x above about 0.05 and provide first constraints at x near 10^-3.