CLAS physics database search results Measurement E151M253 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.65 234 0.1604 0.6887 0.0315 0.65 246 -0.211 0.5462 0.0326 0.65 258 2.0377 2.0377 0.1263 0.75 150 -0.4581 0.5383 0.0408 0.75 162 -0.5834 0.6727 0.0462 0.75 174 0.7789 0.9937 0.0557 0.75 222 -0.7422 0.5016 0.0538 0.75 234 -0.5098 0.5196 0.0429 0.75 246 -0.1027 0.5031 0.0306 0.75 258 -0.431 0.5519 0.0397 0.75 270 1.0445 0.8514 0.0697 0.85 246 0.9417 0.6875 0.0642 0.85 258 0.0679 0.6508 0.0303 0.55 246 0.4719 0.5135 0.0419 0.65 234 -0.7069 0.3799 0.0531 0.65 246 0.408 0.4277 0.0392 0.65 258 -0.8436 0.4201 0.0602 0.65 270 -0.0541 0.4802 0.0302 0.75 150 -0.0157 0.5044 0.03 0.75 162 0.7698 0.5839 0.0563 0.75 222 0.0211 0.4897 0.03 0.75 234 0.1198 0.3985 0.0309 0.75 246 -0.3836 0.3631 0.0383 0.75 258 -0.4324 0.4249 0.0402 0.75 270 -0.1825 0.5358 0.0321 0.85 234 -0.5225 0.3969 0.0441 0.85 246 -0.6325 0.4023 0.0493 0.85 258 -0.6291 0.3852 0.0492