CLAS physics database search results Measurement E151M878 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.65 234 -0.3841 0.7293 0.0464 0.75 114 -0.4596 0.7471 0.052 0.75 210 -1.0112 0.6033 0.098 0.75 222 0.2757 0.7625 0.0393 0.85 90 0.4197 0.9747 0.049 0.85 222 0.4422 0.8709 0.0506 0.85 234 0.0363 0.7995 0.0302 0.85 246 1.0917 0.8675 0.1051 0.85 258 -0.9229 0.7365 0.0903 0.55 126 0.2887 0.7341 0.0355 0.65 102 -0.3493 0.7295 0.0378 0.65 126 -1.645 0.5652 0.112 0.75 114 -0.1216 0.8233 0.031 0.75 222 1.6575 0.8749 0.1128 0.75 234 0.2348 0.8686 0.0337 0.75 294 0.3272 0.7233 0.0369 0.85 210 1.0371 0.9386 0.0744 0.85 222 -1.1041 0.7679 0.0784 0.85 234 0.9863 0.7603 0.0713 0.85 246 -0.1172 0.7575 0.031 0.85 258 1.0045 0.9391 0.0724 0.95 246 -0.1072 1.3089 0.0308 0.95 258 0.3155 1.1779 0.0365