CLAS physics database search results Measurement E209M78 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y' Data errors Systematic errors GeV 1.72 -0.2723 0.9375 0.0716 1.8 0.9546 0.2831 0.0724 1.88 0.9592 0.1795 0.0724 1.96 0.9896 0.222 0.0725 2.04 0.4525 0.3875 0.0717 2.12 0.4065 0.6579 0.0717 2.2 0.4798 0.7519 0.0717 2.28 0.9822 0.7509 0.0724 2.36 -0.9521 0.9172 0.0724