Proton Spin Structure in the Resonance Region

Proton Spin Structure in the Resonance Region

Phys.Rev.Lett.98:132003,2007 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 Q^2 = 1.3 GeV^2. Using the Jefferson Lab polarized electron beam, a spectrometer, and a polarized solid tar...

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Hauptverfasser: RSS Collaboration, 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, Hu, B, 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
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Sprache:eng
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Physics - High Energy Physics - Phenomenology
Physics - Nuclear Experiment
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Zusammenfassung:Phys.Rev.Lett.98:132003,2007 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 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.
DOI:10.48550/arxiv.nucl-ex/0608003