Phys. Rev. Lett. 98, 132003 (2007) [5 pages]Proton Spin Structure in the Resonance RegionReceived 1 August 2006; published 30 March 2007 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 A∥ and A⊥ to high precision, and extracted the asymmetries A1 and A2, and the spin structure functions g1 and g2. We found a notably nonzero A⊥, significant contributions from higher-twist effects, and only weak support for polarized quark-hadron duality. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.132003
DOI:
10.1103/PhysRevLett.98.132003
PACS:
13.60.−r, 13.40.Gp, 13.88.+e, 14.20.Dh
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