2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/180692The 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.4 pages, 2 figures. to appear in the proceedings of the 17th International Spin Physics Symposium (SPIN 2006), Kyoto, Japan, 2-7 Oct. 2006Nuclear Experimenttext