CLAS physics database search results Measurement E151M879 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.65 114 -0.1077 0.836 0.0316 0.75 114 -0.6525 0.8326 0.0673 0.85 78 0.4444 0.9984 0.0508 0.85 222 1.0603 0.9224 0.1024 0.85 246 1.0379 0.8001 0.1004 0.95 258 0.534 2.1803 0.0577 0.55 114 -0.2082 0.7519 0.033 0.65 126 -0.9546 0.7196 0.0695 0.75 114 -0.0175 0.749 0.03 0.75 126 0.2485 0.7907 0.0341 0.85 78 -0.5889 0.7425 0.0489 0.85 222 -0.8896 0.8363 0.0656 0.85 234 0.1339 0.781 0.0313 0.85 246 -0.4692 0.8195 0.043 0.85 258 -0.46 0.8159 0.0426 0.95 210 1.7108 1.483 0.1162 0.95 258 1.1664 1.3052 0.0822