Proton spin structure in the resonance region

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. DunneM. 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. Rondón, 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

Research output: Contribution to journalArticlepeer-review

Abstract

We have examined the spin structure of the proton in the region of the nucleon resonances (1.085GeV<W<1.910GeV) at an average four momentum transfer of Q2=1.3GeV2. Using the Jefferson Lab polarized electron beam, a spectrometer, and a polarized solid target, we measured the asymmetries and 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.

Original languageEnglish
Article number132003
JournalPhysical Review Letters
Volume98
Issue number13
DOIs
StatePublished - 30 Mar 2007

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