CLAS physics database search results Measurement E151M474 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.45 78 -0.3429 0.3985 0.0366 0.55 78 1.066 0.456 0.0718 0.55 90 -0.0237 0.4261 0.03 0.55 270 -0.1863 0.5013 0.0321 0.65 90 -0.3707 0.4988 0.0376 0.65 246 -0.5282 0.442 0.0441 0.65 258 -0.4381 0.3349 0.0402 0.65 270 -0.1143 0.404 0.0308 0.75 114 0.7664 0.5593 0.0557 0.75 126 0.0449 0.4784 0.0301 0.75 138 1.6757 0.4176 0.1068 0.75 234 0.1209 0.5637 0.0309 0.75 246 -0.0767 0.3649 0.0304 0.75 258 -0.2149 0.3438 0.0328 0.75 270 0.3829 0.3724 0.0381 0.85 114 0.0558 0.454 0.0302 0.85 126 -0.1389 0.3487 0.0312 0.85 138 -0.0065 0.3593 0.03 0.85 150 -0.2637 0.3392 0.0341 0.85 162 -0.2599 0.3996 0.034 0.85 174 0.3081 0.4228 0.0354 0.85 186 -0.2406 0.4498 0.0334 0.85 234 -0.4357 0.4101 0.0401 0.85 246 0.4741 0.4364 0.0417 0.85 258 -0.4208 0.434 0.0395 0.95 126 0.7171 0.4947 0.0531 0.95 150 0.306 0.4353 0.0354 0.95 162 -0.2637 0.3954 0.0341 0.95 174 0.3709 0.5048 0.0376 0.95 186 0.4218 0.4511 0.0396