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The experimental study of the single, AN(t), and double, ANN(t), spin analyzing powers was carried out at The Polarized Atomic Hydrogen Jet Target polarimeter (HJET) at The Relativistic Heavy Ion Collider (RHIC). Large statistics of elastic pp events accumulated during RHIC Runs 2015 (Ebeam = 100 GeV) and 2017 (Ebeam = 255 GeV) allowed us to measure analyzing powers in the CNI region 0.001 .−t . 0.02 GeV with unprecedented precision |δAN,NN|. 2×10−4. The hadronic single spin-flip r5 and double spin-flip r2 amplitude parameters were reliably isolated. Based on this two beam energies measurement, Pomeron and Regge-pole contributions to the hadronic singleand doublespin-flip amplitudes were evaluated. Extrapolation of the measured r5(s) to √ s = 200 GeV is in agreement with STAR measurements at this energy. A possibility to use HJET data to search for an Odderon contribution to the spin-flip amplitudes is discussed.

Study of elastic proton-proton single and double spin analyzing powers at RHIC HJET polarimeter