CLAS physics database search results Measurement E209M72 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y Data errors Systematic errors GeV 1.72 -0.4545 0.7225 0.0717 1.8 -0.3503 0.296 0.0716 1.88 0.2826 0.2396 0.0716 1.96 -0.5796 0.3097 0.0718 2.04 -0.3095 0.284 0.0716 2.12 -0.0432 0.3448 0.0715 2.2 -0.7476 0.3408 0.072 2.28 0.4153 0.3044 0.0717 2.36 0.19 0.3068 0.0715