CLAS physics database search results Measurement E209M50 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y Data errors Systematic errors GeV 1.64 -0.0824 0.0477 0.0173 1.72 -0.0559 0.0281 0.0173 1.8 -0.0684 0.0265 0.0173 1.88 -0.1294 0.0296 0.0174 1.96 -0.24 0.0378 0.0175 2.04 -0.1909 0.0503 0.0174 2.12 0.0703 0.0696 0.0173 2.2 0.0907 0.0897 0.0173 2.28 0.0676 0.1346 0.0173 2.36 0.2398 0.1791 0.0175