CLAS physics database search results Measurement E209M56 CLAS12 RG-K K+Y recoil polarization Daniel S. Carman 2025 W P^0_y Data errors Systematic errors GeV 1.64 -0.041 0.0614 0.0173 1.72 -0.0024 0.0212 0.0173 1.8 -0.011 0.0216 0.0173 1.88 -0.1029 0.0242 0.0173 1.96 -0.1459 0.0281 0.0174 2.04 -0.189 0.0319 0.0174 2.12 -0.2007 0.0332 0.0175 2.2 -0.1913 0.0358 0.0174 2.28 -0.1922 0.0398 0.0174 2.36 -0.2377 0.0427 0.0175