Precision small scattering angle measurements of proton-proton and proton-nucleus analyzing powers at the RHIC hydrogen jet polarimeter

Authors :: Poblaguev, A. A.
Zelenski, A.
Aschenauer, E.
Atoian, G.
Eyser, K. O.
Huang, H.
Schmidke, W. B.
Alekseev, I.
Svirida, D.
Buttimore, N. H.
Publication Year :: 2022
Abstract: At RHIC, the hydrogen jet target polarimeter (HJET) is used to measure proton beam polarization with accuracy $\sigma_P^\text{syst}/P\lesssim0.5\%$ by counting low energy (1--10 MeV) recoil protons in left-right symmetric detectors. The HJET performance also allowed us to precisely measure $pp$ and $p$A (where A is any ion stored at RHIC) analyzing powers in the CNI region. The results of the measurements are discussed.<br />Comment: Presented at "Diffraction and Low-$x$ 2022", Corigliano Calabro (Italy), September 24-30, 2022. 6 pages, 8 figures

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