CLAS physics database search results Measurement E151M443 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.55 210 -1.3919 0.6039 0.089 0.55 222 -0.6064 0.8737 0.0473 0.75 222 -0.8973 0.6105 0.0618 0.85 138 -1.0999 0.7434 0.0727 0.85 222 0.8748 1.1996 0.0606 0.85 234 1.4776 1.0661 0.0939 0.45 246 -0.4033 0.7192 0.039 0.55 234 -0.695 0.6571 0.0525 0.75 210 0.816 0.7409 0.0588 0.75 234 1.3818 0.6456 0.0907 0.85 138 -0.3854 0.7049 0.0383 0.85 234 0.6857 0.6383 0.052 0.85 246 -0.2404 0.6779 0.0335