CLAS physics database search results Measurement E151M590 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.65 90 0.3038 0.8288 0.0353 0.65 102 0.5485 0.7005 0.045 0.65 114 -0.47 0.7085 0.0415 0.65 246 0.0243 0.6701 0.03 0.75 90 0.9176 0.7541 0.0636 0.75 102 -0.952 0.5801 0.0655 0.75 126 -1.2314 0.5372 0.0811 0.75 222 -0.2779 0.7176 0.0345 0.75 234 -1.1499 0.4581 0.0765 0.75 246 0.7519 0.7425 0.0549 0.75 258 0.9175 0.7091 0.0636 0.85 66 -0.1813 0.5733 0.032 0.85 114 -0.1558 0.6801 0.0315 0.85 126 -0.508 0.6439 0.0432 0.85 222 -0.4276 0.6628 0.0398 0.85 234 0.8115 0.6631 0.058 0.85 246 0.9772 0.6835 0.0669 0.85 258 -1.4498 0.4955 0.0936 0.85 270 0.821 0.657 0.0585 0.85 282 -1.0776 0.4994 0.0724 0.85 294 0.0286 0.6702 0.0301 0.95 66 0.8505 0.6715 0.06 0.95 258 0.1258 0.6504 0.031 0.95 282 0.5411 0.5681 0.0447