CLAS physics database search results Measurement E209M74 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y' Data errors Systematic errors GeV 1.72 0.2183 0.2283 0.0715 1.8 0.1241 0.1957 0.0715 1.88 0.3359 0.1229 0.0716 1.96 0.4687 0.1413 0.0717 2.04 -0.7134 0.2569 0.072 2.12 -0.7059 0.3655 0.072 2.2 0.3417 0.4442 0.0716 2.28 -0.465 0.5371 0.0717 2.36 0.8309 0.588 0.0722