Absolute Polarization Measurements at RHIC in the Coulomb Nuclear Interference Region
Abstract
The Relativistic Heavy Ion Collider at Brookhaven National Laboratory provides polarized proton beams for the investigation of the nucleon spin structure. For polarimetry, carbon-proton and proton-proton scattering is used in the Coulomb nuclear interference region at small momentum transfer (). Fast polarization measurements of each beam are carried out with carbon fiber targets at several times during an accelerator store. A polarized hydrogen gas jet target is needed for absolute normalization over multiple stores, while the target polarization is constantly monitored in a Breit-Rabi polarimeter. In 2005, the jet polarimeter has been used with both RHIC beams. We present results from the jet polarimeter including a detailed analysis of background contributions to asymmetries and to the beam polarization.
Keywords
Cite
@article{arxiv.nucl-ex/0612020,
title = {Absolute Polarization Measurements at RHIC in the Coulomb Nuclear Interference Region},
author = {K. O. Eyser and I. Alekseev and A. Bravar and G. Bunce and S. Dhawan and R. Gill and W. Haeberli and H. Huang and O. Jinnouchi and Y. Makdisi and I. Nakagawa and A. Nass and H. Okada and E. Stephenson and D. Svirida and T. Wise and J. Wood and A. Zelenski},
journal= {arXiv preprint arXiv:nucl-ex/0612020},
year = {2008}
}
Comments
4 pages, 2 figures. to appear in the proceedings of the 17th International Spin Physics Symposium (SPIN 2006), Kyoto, Japan, 2-7 Oct. 2006