Absolute polarimetry at RHIC
| dc.creator | Okada, H. | |
| dc.creator | Alekseev, I. | |
| dc.creator | Bravar, A. | |
| dc.creator | Bunce, G. | |
| dc.creator | Dhawan, S. | |
| dc.creator | Eyser, K. O. | |
| dc.creator | Gill, R. | |
| dc.creator | Haeberli, W. | |
| dc.creator | Huang, H. | |
| dc.creator | Jinnouchi, O. | |
| dc.creator | Makdisi, Y. | |
| dc.creator | Nakagawa, I. | |
| dc.creator | Nass, A. | |
| dc.creator | Saito, N. | |
| dc.creator | Stephenson, E. | |
| dc.creator | Sviridia, D. | |
| dc.creator | Wise, T. | |
| dc.creator | Wood, J. | |
| dc.creator | Zelenski, A. | |
| dc.date | 2007-12-10 | |
| dc.date | 2008-01-09 | |
| dc.date.accessioned | 2026-07-07T11:39:16Z | |
| dc.date.available | 2026-07-07T11:39:16Z | |
| dc.description | Precise and absolute beam polarization measurements are critical for the RHIC spin physics program. Because all experimental spin-dependent results are normalized by beam polarization, the normalization uncertainty contributes directly to final physics uncertainties. We aimed to perform the beam polarization measurement to an accuracy of $ΔP_{beam}/P_{beam} < 5%$. The absolute polarimeter consists of Polarized Atomic Hydrogen Gas Jet Target and left-right pairs of silicon strip detectors and was installed in the RHIC-ring in 2004. This system features \textit{proton-proton} elastic scattering in the Coulomb nuclear interference (CNI) region. Precise measurements of the analyzing power $A_N$ of this process has allowed us to achieve $ΔP_{beam}/P_{beam} =4.2%$ in 2005 for the first long spin-physics run. In this report, we describe the entire set up and performance of the system. The procedure of beam polarization measurement and analysis results from 2004-2005 are described. Physics topics of $A_N$ in the CNI region (four-momentum transfer squared $0.001 < -t < 0.032 ~ ({\rm GeV}/c)^2$) are also discussed. We point out the current issues and expected optimum accuracy in 2006 and the future. | |
| dc.description | 10 pages, PSTP07 proceedings contribution | |
| dc.identifier | https://arxiv.org/abs/0712.1389 | |
| dc.identifier | http://arxiv.org/abs/0712.1389 | |
| dc.identifier | AIPConf.Proc.980:370-379,2008 | |
| dc.identifier | doi:10.1063/1.2888110 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/199859 | |
| dc.subject | Nuclear Experiment | |
| dc.title | Absolute polarimetry at RHIC | |
| dc.type | text |