Year: 2007
Type: article
Abstract: We have examined the spin structure of the proton in the region of the nucleon resonances ($1.085\text{ }\text{ }\mathrm{GeV}<W<1.910\text{ }\text{ }\mathrm{GeV}$) at an average four momentum transfer of ${Q}^{2}=1.3\text{ }\text{ }{\mathrm{GeV}}^{2}$. Using the Jefferson Lab polarized electron beam, a spectrometer, and a polarized solid target, we measured the asymmetries ${A}_{\ensuremath{\parallel}}$ and ${A}_{\ensuremath{\perp}}$ 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 nonzero ${A}_{\ensuremath{\perp}}$, significant contributions from higher-twist effects, and only weak support for polarized quark-hadron duality.
Source: Physical Review Letters
Authors: 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. 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
Institutions: University of Virginia, A. Alikhanyan National Laboratory, North Carolina Agricultural and Technical State University, University of Basel, Florida International University, Thomas Jefferson National Accelerator Facility, Mississippi State University, Hampton University, Southern University at New Orleans, University of North Carolina Wilmington, Norfolk State University, Old Dominion University, Tel Aviv University, University of Maryland, College Park, Virginia Tech
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2003444467