Proton spin structure in the resonance region

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 Q(2)=1.3 GeV2. Using the Jefferson Lab polarized electron beam, a spectrometer, and a polarized solid target, we measured the asymmetries A(parallel to) and A(perpendicular to) to high precision, and extracted the asymmetries A(1) and A(2), and the spin structure functions g(1) and g(2). We found a notably nonzero A(perpendicular to), significant contributions from higher-twist effects, and only weak support for polarized quark-hadron duality.