CLAS physics database search results Measurement E209M52 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y Stat. error Syst. error GeV 1.64 -0.2192 0.0743 0.0175 1.72 -0.0444 0.0329 0.0173 1.8 0.0056 0.0295 0.0173 1.88 -0.0491 0.031 0.0173 1.96 -0.1415 0.0317 0.0174 2.04 -0.1868 0.0318 0.0174 2.12 -0.1767 0.031 0.0174 2.2 -0.2402 0.0315 0.0175 2.28 -0.2131 0.0319 0.0175 2.36 -0.2074 0.0333 0.0175