CLAS physics database search results Measurement E151M987 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.55 78 -0.4277 0.6712 0.0433 0.55 282 0.4399 0.7311 0.044 0.65 90 -1.0055 0.5519 0.0794 0.65 282 0.2595 0.7217 0.0355 0.75 66 1.0357 0.7454 0.0814 0.75 78 0.4997 0.7503 0.0473 0.75 258 1.0851 0.6749 0.0848 0.75 282 -1.4945 0.3411 0.1133 0.75 294 0.6372 0.6451 0.0554 0.75 306 -0.6143 0.6035 0.054 0.85 66 -0.8568 0.5574 0.0694 0.85 78 0.0911 0.6527 0.0307 0.85 90 -0.3971 0.5417 0.0417 0.85 102 1.3557 0.7991 0.1035 0.85 114 0.6857 0.8841 0.0584 0.85 234 0.5375 0.736 0.0494 0.85 258 -0.3491 0.5855 0.0394 0.85 270 0.1112 0.607 0.0311 0.85 282 -1.5927 0.3743 0.1202 0.85 294 -1.1273 0.4756 0.0877 0.85 306 -1.0184 0.5254 0.0803 0.85 318 -0.4681 0.6106 0.0455 0.85 330 -0.4868 0.5788 0.0465 0.95 234 0.1352 0.711 0.0316 0.95 246 -0.0973 0.6179 0.0308 0.95 258 0.0018 0.6425 0.03 0.95 270 0.905 0.7429 0.0726