CLAS physics database search results Measurement E151M2212 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.65 258 -0.0107 0.9199 0.03 0.65 270 0.6767 0.8057 0.0575 0.75 90 1.2413 0.6716 0.0949 0.75 102 0.9646 0.8186 0.0761 0.75 114 0.6043 0.7779 0.0531 0.75 246 -0.6943 0.7115 0.0586 0.75 258 -0.7005 0.6747 0.059 0.75 270 -1.2799 0.7292 0.0975 0.75 282 -0.2759 0.9047 0.0361 0.85 90 1.802 0.8856 0.1341 0.85 102 0.7663 0.6764 0.0631 0.85 114 0.9026 0.7339 0.072 0.85 126 0.3421 0.6962 0.0389 0.85 138 1.4413 0.7357 0.1087 0.85 222 -0.1982 0.7226 0.0333 0.85 234 0.5977 0.7511 0.0527 0.85 246 -0.805 0.6781 0.0656 0.85 258 -0.8073 0.5814 0.0658 0.85 270 1.1402 0.6814 0.088 0.85 282 -0.4016 0.6805 0.0418 0.95 102 0.6701 0.8654 0.0571 0.95 114 0.3491 0.758 0.0393 0.95 258 -1.1716 0.6675 0.0901 0.95 270 -0.4031 0.6765 0.0419 0.95 282 1.0381 0.6372 0.081 0.95 294 0.7864 0.7421 0.0644