CLAS physics database search results Measurement E209M82 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y Data errors Systematic errors GeV 1.72 -0.0584 0.2857 0.0715 1.8 -0.1425 0.1983 0.0715 1.88 -0.2197 0.1223 0.0715 1.96 -0.2085 0.1402 0.0715 2.04 0.0156 0.2341 0.0715 2.12 0.0623 0.3161 0.0715 2.2 0.4669 0.8431 0.0717 2.28 -0.4478 0.5024 0.0717 2.36 0.3628 0.5968 0.0716