CLAS physics database search results Measurement E151M427 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.65 210 -0.1335 1.0491 0.0311 0.65 222 -0.5682 0.7714 0.0455 0.65 234 0.2868 0.9025 0.0346 0.65 246 -1.0416 0.6248 0.0695 0.75 210 1.8587 1.4593 0.1159 0.75 222 0.9616 1.219 0.0652 0.75 234 0.3386 1.017 0.0363 0.85 222 1.1269 1.1477 0.0742 0.85 234 0.8949 1.1663 0.0617 0.85 246 -1.0542 0.586 0.0702 0.35 42 0.0825 0.7116 0.0304 0.55 234 0.6548 0.6995 0.0504 0.75 210 0.3655 0.7135 0.0376 0.75 222 0.5334 0.6935 0.0446 0.75 234 -0.3129 0.6918 0.0357 0.85 138 0.3374 0.7279 0.0366 0.85 210 -0.4152 0.6814 0.0395 0.85 222 -0.0375 0.6663 0.0301 0.85 234 -0.2066 0.5942 0.0326 0.85 246 0.185 0.6942 0.0321