CLAS physics database search results Measurement E209M42 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y' Data errors Systematic errors GeV 1.64 0.0144 0.046 0.0173 1.72 -0.1414 0.0276 0.0174 1.8 -0.186 0.0262 0.0174 1.88 -0.107 0.0296 0.0173 1.96 0.0586 0.0385 0.0173 2.04 -0.0943 0.0508 0.0173 2.12 0.0392 0.0698 0.0173 2.2 0.1473 0.0911 0.0174 2.28 -0.0285 0.1329 0.0173 2.36 0.4503 0.1841 0.0181