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Title: Proton Spin Structure in the Resonance Region

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{sup 2}=1.3 GeV{sup 2}. Using the Jefferson Lab polarized electron beam, a spectrometer, and a polarized solid target, we measured the asymmetries A{sub parallel} and A{sub perpendicular} to high precision, and extracted the asymmetries A{sub 1} and A{sub 2}, and the spin structure functions g{sub 1} and g{sub 2}. We found a notably nonzero A{sub perpendicular}, significant contributions from higher-twist effects, and only weak support for polarized quark-hadron duality.

Authors:
 [1];  [2]; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]; more »;  [3] « less
  1. University of Virginia, Charlottesville, Virginia 22903 (United States)
  2. (United States)
  3. Yerevan Physics Institute, Yerevan (Armenia) (and others)
Publication Date:
OSTI Identifier:
20951184
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 13; Other Information: DOI: 10.1103/PhysRevLett.98.132003; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; CEBAF ACCELERATOR; ELECTRON BEAMS; FOUR MOMENTUM TRANSFER; GEV RANGE 01-10; POLARIZED BEAMS; PROTONS; QUARK-HADRON INTERACTIONS; RESONANCE; SPIN; STRUCTURE FUNCTIONS

Citation Formats

Wesselmann, F. R., Norfolk State University, Norfolk, Virginia 23504, Slifer, K., Tajima, S., Crabb, D., Day, D., Frlez, E., Lindgren, R., McKee, P., McNulty, D., Norum, B., Pocanic, D., Prok, Y., Rondon, O. A., Sawatzky, B., Smith, C., Wang, K., Zeier, M., Zhu, H., Aghalaryan, A., and Asaturyan, R. Proton Spin Structure in the Resonance Region. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.132003.
Wesselmann, F. R., Norfolk State University, Norfolk, Virginia 23504, Slifer, K., Tajima, S., Crabb, D., Day, D., Frlez, E., Lindgren, R., McKee, P., McNulty, D., Norum, B., Pocanic, D., Prok, Y., Rondon, O. A., Sawatzky, B., Smith, C., Wang, K., Zeier, M., Zhu, H., Aghalaryan, A., & Asaturyan, R. Proton Spin Structure in the Resonance Region. United States. doi:10.1103/PHYSREVLETT.98.132003.
Wesselmann, F. R., Norfolk State University, Norfolk, Virginia 23504, Slifer, K., Tajima, S., Crabb, D., Day, D., Frlez, E., Lindgren, R., McKee, P., McNulty, D., Norum, B., Pocanic, D., Prok, Y., Rondon, O. A., Sawatzky, B., Smith, C., Wang, K., Zeier, M., Zhu, H., Aghalaryan, A., and Asaturyan, R. Fri . "Proton Spin Structure in the Resonance Region". United States. doi:10.1103/PHYSREVLETT.98.132003.
@article{osti_20951184,
title = {Proton Spin Structure in the Resonance Region},
author = {Wesselmann, F. R. and Norfolk State University, Norfolk, Virginia 23504 and Slifer, K. and Tajima, S. and Crabb, D. and Day, D. and Frlez, E. and Lindgren, R. and McKee, P. and McNulty, D. and Norum, B. and Pocanic, D. and Prok, Y. and Rondon, O. A. and Sawatzky, B. and Smith, C. and Wang, K. and Zeier, M. and Zhu, H. and Aghalaryan, A. and Asaturyan, R.},
abstractNote = {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{sup 2}=1.3 GeV{sup 2}. Using the Jefferson Lab polarized electron beam, a spectrometer, and a polarized solid target, we measured the asymmetries A{sub parallel} and A{sub perpendicular} to high precision, and extracted the asymmetries A{sub 1} and A{sub 2}, and the spin structure functions g{sub 1} and g{sub 2}. We found a notably nonzero A{sub perpendicular}, significant contributions from higher-twist effects, and only weak support for polarized quark-hadron duality.},
doi = {10.1103/PHYSREVLETT.98.132003},
journal = {Physical Review Letters},
number = 13,
volume = 98,
place = {United States},
year = {Fri Mar 30 00:00:00 EDT 2007},
month = {Fri Mar 30 00:00:00 EDT 2007}
}