CLAS physics database search results Measurement E151M2303 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.55 90 -1.6117 0.8773 0.1207 0.65 102 -0.693 0.8479 0.0585 0.65 114 -0.5048 0.993 0.0473 0.65 246 -0.4583 1.0293 0.0448 0.75 66 0.0214 0.8562 0.03 0.75 102 0.5376 0.91 0.0492 0.75 222 -0.0931 0.9284 0.0307 0.75 234 -1.2977 0.7686 0.0988 0.75 246 1.4909 0.8762 0.1122 0.85 54 -0.6833 0.9922 0.0579 0.85 210 0.1164 0.9402 0.0312 0.85 222 -1.0236 0.8462 0.0801 0.85 234 -0.6335 0.8309 0.0549 0.85 246 1.7586 0.719 0.131 0.85 258 0.767 0.7948 0.0632 0.85 270 0.0069 0.8701 0.03 0.85 282 -0.2871 0.8691 0.0365 0.85 294 -0.7428 0.8814 0.0617 0.95 222 0.32 0.879 0.0379 0.95 234 -0.1855 0.9022 0.0329 0.95 246 -1.9499 0.7227 0.1445 0.95 258 0.6511 0.8647 0.0559 0.95 270 0.4809 0.8934 0.046 0.95 282 -1.0459 0.6138 0.0816 0.95 294 0.8419 0.6119 0.068 0.95 306 -1.1287 0.7243 0.0872 0.95 318 0.2667 0.7767 0.0357