CLAS physics database search results Measurement E151M1366 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.45 54 -0.6113 0.9959 0.0752 0.45 66 -0.9563 1.0154 0.112 0.55 54 0.5906 0.921 0.0731 0.55 234 -0.2075 0.8438 0.038 0.65 42 0.7098 0.9138 0.0855 0.65 222 -0.1581 0.8006 0.0349 0.65 234 -0.9599 0.8041 0.1123 0.65 246 -0.1058 0.7107 0.0323 0.75 234 0.4532 0.7556 0.0593 0.85 222 -1.1267 0.8264 0.1306 0.85 234 -0.7817 0.7689 0.0931