CLAS physics database search results Measurement E151M679 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.65 114 -1.2483 0.604 0.082 0.65 126 -0.4734 0.7253 0.0417 0.65 210 1.8009 0.991 0.1142 0.65 294 0.318 0.773 0.0358 0.75 126 -0.9306 0.6728 0.0643 0.75 138 -0.6247 0.7534 0.0486 0.75 234 1.5917 0.8277 0.1019 0.75 246 -0.0089 0.7933 0.03 0.75 294 1.0857 0.8227 0.0729 0.85 90 -0.2174 0.7815 0.0328 0.85 102 -0.3536 0.669 0.037 0.85 222 -0.5408 0.6145 0.0447 0.85 234 2.09 0.624 0.1313 0.85 246 0.6184 0.687 0.0483 0.85 258 1.4988 0.8263 0.0965 0.95 234 0.2887 0.7016 0.0348 0.95 246 0.2458 0.6542 0.0336