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

*Corresponding author for this work

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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