CLAS physics database search results Measurement E151M288 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.65 246 0.9914 0.6468 0.0683 0.65 258 -0.1836 0.4918 0.0573 0.75 102 -0.2037 0.5421 0.0367 0.75 114 0.5953 0.5652 0.0595 0.75 126 -0.3688 0.8499 0.0373 0.75 234 -0.5427 0.7292 0.0444 0.75 270 0.0573 0.5275 0.0352 0.75 282 -0.4134 0.4627 0.0493 0.75 294 0.1225 0.4333 0.038 0.85 90 -0.4437 0.6144 0.0407 0.85 102 -0.509 0.5319 0.0435 0.85 114 -0.4308 0.4477 0.0416 0.85 126 -0.3288 0.5116 0.0471 0.85 138 -0.3817 0.454 0.0409 0.85 150 0.9281 0.505 0.0698 0.85 162 -0.4377 0.7973 0.0399 0.85 174 0.4767 1.1484 0.0415 0.85 234 -0.0479 0.6292 0.0301 0.85 246 -0.701 0.6171 0.0518 0.95 66 0.5861 1.0021 0.0463 0.95 126 -0.9751 0.5057 0.0659 0.95 138 -0.7455 0.6485 0.054 0.95 270 -0.1736 0.5729 0.0318 0.85 258 0.1614 0.5175 0.0316 0.85 282 -0.2601 0.5694 0.0341 0.85 294 0.6715 0.5573 0.0513 0.85 306 0.7857 0.5224 0.0572 0.95 54 -0.0355 0.5488 0.0301 0.95 114 -0.003 0.5639 0.03 0.95 126 0.441 0.5447 0.0406 0.95 138 0.5996 0.58 0.0477 0.95 150 -0.1844 0.5539 0.0321