CLAS physics database search results Measurement E151M329 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.55 222 0.2521 0.5539 0.0373 0.65 138 -0.7981 0.5708 0.0578 0.65 222 -0.7286 0.5573 0.0542 0.65 234 0.3169 0.4718 0.0358 0.65 246 -1.0306 0.5466 0.0705 0.75 150 -1.4976 0.5614 0.0975 0.75 222 0.7465 0.6138 0.0551 0.75 234 -0.8105 0.629 0.0585 0.85 222 0.1526 0.6361 0.0315 0.85 234 0.7587 0.5989 0.0557 0.85 246 0.7979 0.5697 0.0578 0.55 234 0.5847 1.1551 0.0463 0.65 222 0.5397 1.1686 0.0442 0.65 234 -0.0381 0.8198 0.0301 0.65 246 0.7003 1.1223 0.0518 0.75 138 0.5173 1.0416 0.0432 0.75 234 -0.1755 0.7136 0.0318 0.85 210 -0.3183 0.7872 0.0356 0.85 222 2.1355 1.0277 0.1321 0.85 234 -0.2643 0.6353 0.034 0.85 246 0.2996 0.9122 0.035