CLAS physics database search results Measurement E151M2143 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.55 126 1.853 2.1647 0.1729 0.55 222 2.6788 1.7889 0.248 0.65 126 -3.1633 2.0661 0.2923 0.65 222 -2.5839 1.9319 0.2394 0.75 198 -1.4904 2.0834 0.1402 0.75 210 -2.4446 1.8207 0.2267 0.75 222 -1.6343 2.0348 0.1532 0.75 270 -0.9838 1.7648 0.0953 0.75 282 -2.3565 1.5956 0.2186 0.85 126 0.2064 2.4259 0.0355 0.85 210 4.1785 2.1701 0.3852 0.85 270 -3.3951 1.8123 0.3135 0.45 270 -0.2115 0.694 0.033 0.65 126 0.4518 0.7738 0.042 0.65 210 -1.4273 0.6603 0.0976 0.65 282 -0.8193 0.5811 0.0612 0.75 198 -0.007 0.8503 0.03 0.75 210 -0.3354 0.7289 0.0371 0.75 222 -0.7264 0.7194 0.056 0.75 270 1.218 0.6135 0.0847 0.75 282 -0.6518 0.5985 0.0519 0.85 114 -0.5517 0.6708 0.0468 0.85 234 -0.4673 0.7536 0.0427