CLAS physics database search results Measurement E151M899 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.65 126 -1.2156 0.6235 0.1161 0.65 282 1.3749 0.7197 0.1304 0.65 294 -0.7016 0.538 0.0714 0.75 282 -0.1806 0.5213 0.0343 0.75 294 1.5714 0.7108 0.1481 0.85 102 -2.2861 0.5941 0.2131 0.85 114 -0.4997 0.9312 0.055 0.85 246 0.3732 0.8599 0.0457 0.55 282 -0.155 0.6482 0.0317 0.65 114 1.3561 0.7513 0.0939 0.65 210 -0.0296 0.8203 0.0301 0.65 222 1.4198 0.8598 0.0979 0.65 294 -0.9039 0.5248 0.0665 0.75 126 -0.931 0.7062 0.0681 0.75 222 -0.3728 0.6942 0.0387 0.75 234 -0.2056 0.7724 0.0329 0.75 282 -0.2923 0.6141 0.0356 0.85 102 0.648 0.8253 0.052 0.85 114 0.6731 0.7838 0.0534 0.85 222 1.1642 0.9069 0.0821 0.85 234 1.3064 0.8475 0.0908 0.95 246 -0.2023 1.2638 0.0328