CLAS physics database search results Measurement E209M40 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y Data errors Systematic errors GeV 1.64 -0.0104 0.0415 0.0173 1.72 -0.0614 0.0172 0.0173 1.8 -0.0563 0.0169 0.0173 1.88 -0.0571 0.0194 0.0173 1.96 -0.1185 0.0224 0.0173 2.04 -0.139 0.0252 0.0174 2.12 -0.1753 0.0271 0.0174 2.2 -0.3069 0.0285 0.0177 2.28 -0.2278 0.0317 0.0175 2.36 -0.1842 0.0339 0.0174