CLAS physics database search results Measurement E209M81 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y Data errors Systematic errors GeV 1.72 -0.137 0.4219 0.0715 1.8 -0.5901 0.4211 0.0718 1.88 0.1574 0.2266 0.0715 1.96 -0.3639 0.2586 0.0716 2.04 0.0488 0.3436 0.0715 2.12 -0.1886 0.3258 0.0715 2.2 -0.3373 0.2875 0.0716 2.28 -0.6962 0.3235 0.072 2.36 -0.9562 0.3727 0.0724