CLAS physics database search results Measurement E209M34 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y Data errors Systematic errors GeV 1.64 -0.2032 0.0332 0.0175 1.72 -0.1162 0.0189 0.0173 1.8 -0.0987 0.0174 0.0173 1.88 -0.1729 0.0181 0.0174 1.96 -0.2178 0.023 0.0175 2.04 -0.2326 0.0314 0.0175 2.12 -0.0443 0.0416 0.0173 2.2 -0.1311 0.0564 0.0174 2.28 0.1481 0.0761 0.0174 2.36 0.2763 0.1102 0.0176