CLAS physics database search results Measurement E151M401 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.55 234 3.3832 3.3832 0.2059 0.65 222 0.1672 0.9193 0.0316 0.65 234 -0.8703 0.6211 0.0604 0.65 246 -0.0479 0.7742 0.0301 0.75 222 -0.1743 0.8963 0.0318 0.75 258 -0.0118 0.8766 0.03 0.85 222 1.5236 1.2436 0.0965 0.85 246 0.3885 0.8664 0.038 0.85 258 1.7735 1.0549 0.1109 0.85 270 -0.7733 0.5418 0.0554 0.95 246 -0.0388 0.7464 0.0301 0.95 270 -0.2963 0.625 0.0349 0.55 246 1.3363 0.5772 0.088 0.65 126 0.1623 0.6716 0.0316 0.65 222 0.8639 0.5656 0.0613 0.65 234 -0.1436 0.596 0.0313 0.75 234 -0.6128 0.5566 0.0484 0.75 246 1.151 0.6072 0.0773 0.75 258 -0.3835 0.5963 0.0383 0.85 234 0.1365 0.605 0.0312 0.85 246 -0.6323 0.527 0.0493 0.85 258 -0.1174 0.5658 0.0309