CLAS physics database search results Measurement E151M1172 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.65 126 -0.4059 0.868 0.0422 0.65 138 4.0468 4.0468 0.2973 0.75 102 0.4423 0.9983 0.0441 0.75 114 -1.0469 0.8073 0.0822 0.75 210 0.9489 1.0148 0.0756 0.75 222 -1.3025 0.7023 0.0998 0.85 102 1.7849 0.7831 0.1339 0.85 114 1.2325 0.7778 0.0949 0.85 126 0.775 1.0504 0.0641 0.85 174 -0.3382 0.9035 0.0389 0.85 186 -0.473 0.6656 0.0458 0.85 198 -1.1419 0.6277 0.0887 0.85 210 -1.0571 0.7517 0.0829