CLAS physics database search results Measurement E151M558 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.65 102 0.5531 0.7824 0.0452 0.65 258 -0.0327 0.7154 0.0301 0.75 90 0.2342 0.6754 0.0332 0.75 102 -0.1589 0.6218 0.0315 0.75 114 -0.3204 0.7058 0.0358 0.75 126 0.8358 0.73 0.0593 0.75 234 0.5238 0.632 0.0439 0.75 246 -0.3219 0.5953 0.0359 0.85 66 -0.7109 0.5608 0.0528 0.85 90 0.3532 0.5253 0.037 0.85 102 0.4008 0.6229 0.0387 0.85 114 0.4459 0.5819 0.0405 0.85 126 0.562 0.5393 0.0456 0.85 222 -0.0446 0.6316 0.0301 0.85 234 -0.66 0.5116 0.0503 0.85 246 -0.4182 0.4935 0.0394 0.85 258 0.6361 0.6884 0.0491 0.85 270 -0.344 0.5006 0.0366 0.85 282 -0.0931 0.5047 0.0305 0.85 294 -0.4585 0.4502 0.0411 0.95 138 0.0205 0.6648 0.03 0.95 270 1.1097 0.5913 0.0742 0.95 282 -0.0969 0.513 0.0306 0.95 294 2.039 2.039 0.1283