CLAS physics database search results Measurement E151M1922 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.45 78 0.2299 0.7379 0.0331 0.45 270 -0.454 0.5885 0.0407 0.45 282 0.5442 0.6893 0.0446 0.55 114 -0.9651 0.6834 0.0657 0.55 126 -0.9323 0.6283 0.064 0.55 198 0.5093 0.7116 0.043 0.55 222 -1.6726 0.6541 0.1057 0.65 114 -0.1612 0.7753 0.0315 0.65 138 0.2145 0.6913 0.0327 0.65 210 0.1421 0.6903 0.0312 0.65 222 -1.6256 0.561 0.103 0.65 294 -0.8735 0.6759 0.0608 0.75 66 -0.5572 0.737 0.0452 0.75 198 -0.3151 0.6462 0.0356 0.75 210 -0.1395 0.6664 0.0312 0.75 222 -0.8972 0.6511 0.0621 0.75 234 0.661 0.713 0.05 0.75 270 1.2169 0.5827 0.0796 0.75 282 0.4038 0.5398 0.0387 0.75 294 -0.5698 0.7358 0.0457 0.85 102 -0.1285 0.7192 0.031 0.85 114 1.7738 0.5788 0.1116 0.85 126 -0.4232 0.7012 0.0395 0.85 198 -0.7389 0.7149 0.0539 0.85 210 -0.0115 0.656 0.03 0.85 222 -1.1936 0.5674 0.0783