CLAS physics database search results Measurement E151M2406 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.75 102 1.3191 1.0528 0.1002 0.75 114 0.0212 1.0279 0.03 0.75 186 -1.2202 1.1393 0.0934 0.75 198 0.3297 1.0633 0.0384 0.75 210 -1.143 1.0325 0.0881 0.85 102 2.2362 0.7681 0.1649 0.85 114 -2.7562 0.7146 0.2021 0.85 126 1.7923 0.8864 0.1334 0.85 174 -1.7067 1.0588 0.1273 0.85 186 -1.796 0.8936 0.1336 0.85 198 0.3499 0.9629 0.0393 0.85 210 0.7622 0.9251 0.0629