CLAS physics database search results Measurement E209M53 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y Stat. error Syst. error GeV 1.64 0.3035 0.0925 0.0177 1.72 0.414 0.0483 0.018 1.8 0.4603 0.0498 0.0182 1.88 0.5267 0.0468 0.0184 1.96 0.4761 0.0522 0.0182 2.04 0.3139 0.0717 0.0177 2.12 0.6153 0.118 0.0188 2.2 0.6265 0.1754 0.0189 2.28 0.2766 0.1964 0.0176 2.36 0.0909 0.2288 0.0173