CLAS physics database search results Measurement E209M87 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y Data errors Systematic errors GeV 1.72 0.8847 2.3026 0.0723 1.8 0.2753 0.259 0.0716 1.88 -0.8841 0.1985 0.0723 1.96 -0.5805 0.254 0.0718 2.04 -0.0903 0.383 0.0715 2.12 -0.0582 0.4573 0.0715 2.2 -0.0113 0.4919 0.0715 2.28 -0.5205 0.5713 0.0718 2.36 0.195 0.6575 0.0715