CLAS physics database search results Measurement E151M1166 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.65 210 -0.4522 0.897 0.0446 0.65 282 -0.9621 0.6425 0.0765 0.65 294 -0.406 0.7553 0.0422 0.75 90 0.7545 1.0117 0.0628 0.75 198 2.1242 1.0599 0.1581 0.75 210 -0.775 0.8491 0.0641 0.75 222 1.1384 0.9203 0.0884 0.75 234 0.2193 0.9678 0.034 0.85 78 -0.5872 0.7756 0.0524 0.85 90 -0.9163 0.6706 0.0734 0.85 102 -0.8851 0.7792 0.0713 0.85 114 -0.2734 0.7944 0.036 0.85 186 0.341 0.9168 0.039 0.85 198 -0.2517 0.7203 0.0352 0.85 210 0.565 0.8426 0.051 0.85 222 0.3787 0.7963 0.0408 0.85 234 0.047 0.7834 0.0302 0.85 246 -0.3049 0.812 0.0374 0.95 186 -0.6573 0.8062 0.0566 0.95 198 -1.0029 0.7227 0.0792 0.95 210 -1.2403 0.6407 0.0955 0.95 222 -0.4917 0.7777 0.0468 0.95 234 0.9537 0.9068 0.0759 0.95 246 0.602 0.7448 0.0533