Proton Spin Structure in the Resonance Region
Nuclear Experiment
2008-11-26 v3 High Energy Physics - Phenomenology
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.
Keywords
Cite
@article{arxiv.nucl-ex/0608003,
title = {Proton Spin Structure in the Resonance Region},
author = {RSS Collaboration and F. R. Wesselmann and K. Slifer and S. Tajima and A. Aghalaryan and A. Ahmidouch and R. Asaturyan and F. Bloch and W. Boeglin and P. Bosted and C. Carasco and R. Carlini and J. Cha and J. P. Chen and M. E. Christy and L. Cole and L. Coman and D. Crabb and S. Danagoulian and D. Day and J. Dunne and M. Elaasar and R. Ent and H. Fenker and E. Frlez and L. Gan and D. Gaskell and J. Gomez and B. Hu and M. K. Jones and J. Jourdan and C. Keith and C. E. Keppel and M. Khandaker and A. Klein and L. Kramer and Y. Liang and J. Lichtenstadt and R. Lindgren and D. Mack and P. McKee and D. McNulty and D. Meekins and H. Mkrtchyan and R. Nasseripour and I. Niculescu and K. Normand and B. Norum and D. Pocanic and Y. Prok and B. Raue and J. Reinhold and J. Roche and D. Rohe and O. A. Rondon and N. Savvinov and B. Sawatzky and M. Seely and I. Sick and C. Smith and G. Smith and S. Stepanyan and L. Tang and G. Testa and W. Vulcan and K. Wang and G. Warren and S. Wood and C. Yan and L. Yuan and J. Yun and M. Zeier and H. Zhu},
journal= {arXiv preprint arXiv:nucl-ex/0608003},
year = {2008}
}
Comments
6 pages, 4 figures, REVTeX4, similar to PRL submission, plots colorized and appenix added, v3: minor edit, matches PRL