Absolute polarimetry at RHIC

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 pol...

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Hauptverfasser: Okada, H, Alekseev, I, Bravar, A, Bunce, G, Dhawan, S, Eyser, K O, Gill, R, Haeberli, W, Huang, H, Jinnouchi, O, Makdisi, Y, Nakagawa, I, Nass, A, Saito, N, Stephenson, E, Sviridia, D, Wise, T, Wood, J, Zelenski, A
Format: Tagungsbericht
Sprache:eng
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Zusammenfassung: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 DeltaPbeam/Pbeam < 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 proton-proton elastic scattering in the Coulomb nuclear interference (CNI) region. Precise measurements of the analyzing power AN of this process has allowed us to achieve DeltaPbeam/Pbeam = 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 AN in the CNI region (four-momentum transfer squared 0.001 < -t < 0.032(GeV/c)2) are also discussed. We point out the current issues and expected optimum accuracy in 2006 and the future.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.2888110