CLAS physics database search results Measurement E151M877 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.55 114 -1.1009 0.485 0.0911 0.65 102 -0.547 0.6571 0.0468 0.65 114 -0.9352 0.6386 0.0683 0.65 138 -0.1097 0.8562 0.0317 0.65 222 0.7744 0.7566 0.0775 0.65 234 0.8638 0.5589 0.0772 0.75 102 -0.2189 0.7851 0.0333 0.75 114 -0.125 0.5646 0.0452 0.75 126 -0.6311 0.8539 0.0655 0.75 210 -1.1698 0.7536 0.0824 0.75 222 -0.6714 0.6497 0.0533 0.75 234 0.2146 0.5411 0.0347 0.85 90 0.3341 0.9369 0.043 0.85 222 1.1892 0.7805 0.1138 0.85 234 0.4635 0.8025 0.0523 0.85 246 -0.6687 0.8057 0.0686 0.95 234 -1.9619 2.0925 0.1835 0.95 246 2.8995 2.3006 0.2693 0.75 282 1.0922 0.7168 0.0777 0.75 294 -0.2491 0.6854 0.0342 0.85 90 -0.2644 0.8101 0.0347 0.85 198 0.0292 0.9765 0.0301 0.85 222 0.2379 0.7527 0.0338 0.85 234 1.085 0.7963 0.0773 0.85 246 1.1295 0.8224 0.08 0.95 246 -0.7643 1.1817 0.0584 0.95 258 1.0273 1.2973 0.0738