Absolute Polarization Measurements at RHIC in the Coulomb Nuclear Interference Region

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 (-t). F...

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Main Authors: Eyser, K O, Alekseev, I, Bravar, A, Bunce, G, Dhawan, S, Gill, R, Haeberli, W, Huang, H, Jinnouchi, O, Makdisi, Y, Nakagawa, I, Nass, A, Okada, H, Stephenson, E, Svirida, D, Wise, T, Wood, J, Zelenski, A
Format: Conference Proceeding
Language:English
Subjects:
ASYMMETRY
BEAM PRODUCTION
BROOKHAVEN RHIC
CARBON 12 TARGET
CARBON FIBERS
JETS
MOMENTUM TRANSFER
PARTICLE ACCELERATORS
POLARIMETERS
POLARIMETRY
POLARIZATION
POLARIZED BEAMS
POLARIZED TARGETS
PROTON BEAMS
PROTON REACTIONS
PROTON-PROTON INTERACTIONS
PROTONS
SPIN
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Summary: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 (-t). 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.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.2750925