Proton Spin Structure in the Resonance Region
Abstract
We have examined the spin structure of the proton in the region of the nucleon resonances (1.085 GeV < W < 1.910 GeV) at an average four momentum transfer of Q2 = 1.3 GeV2. Using the Jefferson Lab polarized electron beam, a spectrometer, and a polarized solid target, we measured the asymmetries Aparallel and Aperp to high precision, and extracted the asymmetries A1 and A2, and the spin structure functions g1 and g2. We found a notably non-zero Aperp, significant contributions from higher-twist effects, and only weak support for polarized quark--hadron duality.
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