CLAS physics database search results Measurement E151M141 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.55 246 -0.0511 0.6826 0.0306 0.55 258 -0.4629 0.8148 0.0606 0.55 270 -0.7471 0.6272 0.0901 0.65 138 1.2187 0.9598 0.1419 0.65 246 0.3735 0.6482 0.052 0.65 258 0.678 0.6837 0.0828 0.65 270 0.0818 0.6791 0.0314 0.75 138 -0.5969 0.8199 0.0742 0.75 186 0.5238 0.8002 0.0667 0.75 222 -1.3004 0.6633 0.151 0.75 234 0.6805 0.7117 0.083 0.75 246 0.0306 0.7513 0.0302 0.75 258 -0.1897 0.6082 0.037 0.75 270 -0.1196 0.6388 0.0329 0.85 126 -0.5943 0.7518 0.074 0.85 138 -0.2539 0.7417 0.0416 0.85 162 -0.7111 0.6801 0.0863 0.85 234 0.3693 0.7043 0.0516 0.85 246 1.1949 0.7818 0.1392 0.85 258 0.0934 0.5927 0.0318 0.85 270 1.3096 0.5799 0.152 0.85 282 0.2064 0.6918 0.0381 0.95 162 -1.1231 0.5672 0.1313 0.95 258 2.348 2.348 0.2688