CLAS physics database search results Measurement E151M1423 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.55 258 0.8862 0.4206 0.0604 0.55 270 -0.6356 0.3439 0.0497 0.55 282 -0.0617 0.4397 0.0442 0.65 246 -0.3064 0.3876 0.0352 0.65 258 0.0503 0.3303 0.0313 0.65 270 0.1299 0.3508 0.042 0.75 150 -0.8606 0.6935 0.0583 0.75 174 -2.2255 2.2255 0.1328 0.75 186 0.0949 0.8042 0.0305 0.75 234 -0.7341 0.612 0.0522 0.75 246 -0.4288 0.5476 0.039 0.75 258 -0.3063 0.5746 0.0349 0.75 270 0.1603 0.6046 0.0314 0.85 138 0.3718 0.7504 0.037 0.85 150 -0.8925 0.5217 0.0599 0.85 162 -0.3403 0.7485 0.0359 0.85 174 -0.1714 0.6701 0.0316 0.85 186 -0.243 0.7485 0.0332 0.85 198 -0.7631 0.583 0.0536 0.85 222 1.1761 0.5052 0.0747 0.65 282 -1.0338 0.5939 0.0688 0.75 246 -0.1748 0.5059 0.0318 0.75 258 0.1608 0.4547 0.0315 0.75 270 -0.3309 0.4519 0.036 0.85 150 -0.0468 0.5882 0.0301 0.85 162 -0.029 0.5214 0.0301 0.85 174 -0.0104 0.4665 0.03 0.85 186 0.9689 0.3781 0.0654 0.85 198 0.7305 0.4645 0.0531