CLAS physics database search results Measurement E209M66 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y Data errors Systematic errors GeV 1.72 0.9726 0.6398 0.0724 1.8 -0.3133 0.1259 0.0716 1.88 -0.2697 0.0729 0.0716 1.96 -0.3212 0.083 0.0716 2.04 -0.034 0.1263 0.0715 2.12 0.1493 0.1679 0.0715 2.2 -0.6141 0.2118 0.0719 2.28 -0.4111 0.254 0.0717 2.36 -0.4388 0.3392 0.0717