CLAS physics database search results Measurement E209M84 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y Data errors Systematic errors GeV 1.72 0.0031 0.2578 0.0715 1.8 -0.1538 0.4146 0.0715 1.88 -0.6068 0.2788 0.0719 1.96 -0.7514 0.3155 0.0721 2.04 -0.6396 0.3196 0.0719 2.12 -0.6637 0.2994 0.0719 2.2 -0.8921 0.2602 0.0723 2.28 -0.509 0.2332 0.0717 2.36 -0.5548 0.2187 0.0718