CLAS physics database search results Measurement E209M43 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y' Data errors Systematic errors GeV 1.64 0.2808 0.0544 0.0176 1.72 -0.0548 0.0287 0.0173 1.8 -0.1682 0.0267 0.0174 1.88 -0.0778 0.0295 0.0173 1.96 -0.0709 0.0327 0.0173 2.04 -0.0721 0.0353 0.0173 2.12 -0.054 0.0386 0.0173 2.2 0.0383 0.0441 0.0173 2.28 0.0829 0.052 0.0173 2.36 0.1396 0.062 0.0174