CLAS physics database search results Measurement E151M478 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.35 78 -0.2988 0.5159 0.0351 0.45 66 0.6643 0.6394 0.0505 0.45 78 -0.2454 0.3523 0.0335 0.45 282 0.202 0.5581 0.0324 0.55 78 0.4826 0.4321 0.0421 0.55 270 0.0533 0.4321 0.0302 0.55 282 -0.2141 0.3835 0.0327 0.65 258 0.4875 0.5739 0.0423 0.65 270 0.4626 0.3715 0.0412 0.65 282 0.1685 0.3979 0.0317 0.75 102 0.3556 0.6179 0.0371 0.75 114 0.1744 0.5439 0.0318 0.75 258 -0.5184 0.3349 0.0436 0.75 270 0.3945 0.3853 0.0385 0.75 282 -0.2505 0.492 0.0337 0.85 90 -0.7233 0.402 0.0535 0.85 102 -0.295 0.3464 0.035 0.85 114 0.3008 0.393 0.0352 0.85 126 0.6638 0.3817 0.0505 0.85 138 0.364 0.4324 0.0374 0.85 246 0.483 0.4456 0.0421 0.85 258 -0.2966 0.3929 0.0351 0.85 270 0.3691 0.4509 0.0375 0.95 102 0.8349 0.3944 0.0592 0.95 114 -0.4787 0.3126 0.0419 0.95 126 0.2868 0.3935 0.0348 0.95 138 0.7092 0.4868 0.0527 0.95 150 0.2245 0.3828 0.033 0.95 162 -0.275 0.4301 0.0344 0.95 174 -0.0319 0.4271 0.0301 0.95 186 -0.4795 0.4077 0.042 0.95 198 0.0119 0.4863 0.03 0.95 210 0.9591 0.468 0.0659 0.95 234 -0.1639 0.4752 0.0316