CLAS physics database search results Measurement E209M39 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y Data errors Systematic errors 1.64 -0.2377 0.0486 0.0175 1.72 -0.0938 0.0222 0.0173 1.8 -0.1001 0.0224 0.0173 1.88 -0.0236 0.026 0.0173 1.96 -0.1315 0.0313 0.0174 2.04 -0.0565 0.0351 0.0173 2.12 0.059 0.0394 0.0173 2.2 -0.0243 0.0447 0.0173 2.28 -0.0859 0.0514 0.0173 2.36 -0.0147 0.06 0.0173