CLAS physics database search results Measurement E209M31 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y' Data errors Systematic errors GeV 1.64 0.0795 0.0509 0.0173 1.72 0.0233 0.0219 0.0173 1.8 -0.0293 0.022 0.0173 1.88 0.0175 0.0257 0.0173 1.96 -0.0823 0.0311 0.0173 2.04 -0.1498 0.035 0.0174 2.12 -0.1169 0.0392 0.0173 2.2 -0.0468 0.0449 0.0173 2.28 0.0342 0.0516 0.0173 2.36 0.0214 0.0605 0.0173