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Proton Spin Structure in the Resonance Region

RSS Collaboration·F. R. Wesselmann·K. Slifer·S. Tajima·A. Aghalaryan·A. Ahmidouch·R. Asaturyan·F. Bloch·W. Boeglin·P. Bosted·C. Carasco·R. Carlini·J. Cha·J. P. Chen·M. E. Christy·L. Cole·L. Coman·D. Crabb·S. Danagoulian·D. Day·J. Dunne·M. Elaasar·R. Ent·H. Fenker·E. Frlez·L. Gan·D. Gaskell·J. Gomez·B. Hu·M. K. Jones·J. Jourdan·C. Keith·C. E. Keppel·M. Khandaker·A. Klein·L. Kramer·Y. Liang·J. Lichtenstadt·R. Lindgren·D. Mack·P. McKee·D. McNulty·D. Meekins·H. Mkrtchyan·R. Nasseripour·I. Niculescu·K. Normand·B. Norum·D. Pocanic·Y. Prok·B. Raue·J. Reinhold·J. Roche·D. Rohe·O. A. Rondon·N. Savvinov·B. Sawatzky·M. Seely·I. Sick·C. Smith·G. Smith·S. Stepanyan·L. Tang·G. Testa·W. Vulcan·K. Wang·G. Warren·S. Wood·C. Yan·L. Yuan·J. Yun·M. Zeier·H. Zhu
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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 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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RSS Collaboration, F. R. Wesselmann, K. Slifer, S. Tajima, A. Aghalaryan, A. Ahmidouch, R. Asaturyan, F. Bloch, W. Boeglin, P. Bosted, C. Carasco, R. Carlini, J. Cha, J. P. Chen, M. E. Christy, L. Cole, L. Coman, D. Crabb, S. Danagoulian, D. Day, J. Dunne, M. Elaasar, R. Ent, H. Fenker, E. Frlez, L. Gan, D. Gaskell, J. Gomez, B. Hu, M. K. Jones, J. Jourdan, C. Keith, C. E. Keppel, M. Khandaker, A. Klein, L. Kramer, Y. Liang, J. Lichtenstadt, R. Lindgren, D. Mack, P. McKee, D. McNulty, D. Meekins, H. Mkrtchyan, R. Nasseripour, I. Niculescu, K. Normand, B. Norum, D. Pocanic, Y. Prok, B. Raue, J. Reinhold, J. Roche, D. Rohe, O. A. Rondon, N. Savvinov, B. Sawatzky, M. Seely, I. Sick, C. Smith, G. Smith, S. Stepanyan, L. Tang, G. Testa, W. Vulcan, K. Wang, G. Warren, S. Wood, C. Yan, L. Yuan, J. Yun, M. Zeier, H. Zhu. 2007-04-02. Proton Spin Structure in the Resonance Region. https://doi.org/10.1103/physrevlett.98.132003

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