CLAS physics database search results Measurement E209M71 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y Data errors Systematic errors GeV 1.72 0.9585 0.5737 0.0724 1.8 -0.0042 0.1828 0.0715 1.88 -0.255 0.1388 0.0715 1.96 -0.303 0.1714 0.0716 2.04 0.3339 0.2286 0.0716 2.12 0.8583 0.2772 0.0722 2.2 0.6089 0.3091 0.0719 2.28 0.3349 0.3618 0.0716 2.36 0.6358 0.4364 0.0719