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Collaboration, RSS; Wesselmann, F R; Slifer, K; Tajima, S; Aghalaryan, A; Ahmidouch, A; Asaturyan, R; Bloch, F; Boeglin, W; Bosted, P; Carasco, C; Carlini, R; Cha, J; Chen, J P; Christy, M E; Cole, L; Coman, L; Crabb, D; Danagoulian, S; Day, D; Dunne, J; Elaasar, M; Ent, R; Fenker, H; Frlez, E; Gan, L; Gaskell, D; Gomez, J; B Hu; Jones, M K; Jourdan, J; Keith, C; Keppel, C E; Khandaker, M; Klein, A; Kramer, L; Liang, Y; Lichtenstadt, J; Lindgren, R; Mack, D; McKee, P; McNulty, D; Meekins, D; Mkrtchyan, H; Nasseripour, R; Niculescu, I; Normand, K; Norum, B; Pocanic, D; Prok, Y; Raue, B; Reinhold, J; Roche, J; Rohe, D; Rondon, O A; Savvinov, N; Sawatzky, B; Seely, M; Sick, I; Smith, C; Smith, G; Stepanyan, S; Tang, L; Testa, G; Vulcan, W; Wang, K; Warren, G; Wood, S; Yan, C; Yuan, L; Yun, J; Zeier, M; Zhu, H
arXiv.org, 04/2007Paper
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 GeV^2. Using the Jefferson Lab polarized electron beam, a spectrometer, and a polarized solid target, we measured the asymmetries A_parallel and A_perp 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 non-zero A_perp, significant contributions from higher-twist effects, and only weak support for polarized quark--hadron duality.
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in: SICRIS
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