CLAS physics database search results Measurement E151M1154 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.65 114 0.5812 0.961 0.052 0.65 126 -0.6685 0.8587 0.0573 0.75 90 -0.4486 0.829 0.0444 0.75 186 0.1301 0.8712 0.0315 0.75 198 -0.9611 0.7171 0.0764 0.75 234 -0.0147 0.792 0.03 0.75 294 -0.9369 0.6802 0.0748 0.85 78 -0.0097 0.7425 0.03 0.85 90 -0.8737 0.5524 0.0706 0.85 102 -0.1399 0.7599 0.0317 0.85 114 0.3125 0.8942 0.0377 0.85 186 0.6129 1.014 0.0539 0.85 198 -0.2822 0.7003 0.0364 0.85 210 -0.4155 0.6667 0.0427 0.85 222 -0.0362 0.6657 0.0301 0.85 234 1.0255 0.8771 0.0807 0.85 246 -0.0131 0.8471 0.03 0.95 174 -0.7564 0.6623 0.0629 0.95 198 0.1435 0.8451 0.0318 0.95 210 -0.9481 0.7095 0.0755 0.95 222 0.4888 0.7707 0.0467 0.95 234 -0.2451 0.5644 0.0349 0.95 246 1.6076 0.8573 0.1213 0.95 270 -0.5738 0.7232 0.0516