CLAS physics database search results Measurement E151M731 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.45 78 0.1044 0.3527 0.0342 0.55 78 -0.1811 0.3774 0.0523 0.65 270 0.257 1.7492 0.0382 0.75 258 -0.4491 1.9947 0.0512 0.75 270 -1.3859 1.8702 0.1314 0.85 114 3.2287 3.2763 0.2995 0.85 126 -1.5659 2.2189 0.1476 0.85 138 -3.7694 2.5773 0.3492 0.85 150 -0.9906 3.0366 0.0962 0.95 126 -5.849 7.4094 0.5407 0.95 138 3.5106 8.2701 0.3254 0.95 150 1.9993 8.29 0.1869 0.95 162 -0.8251 7.1621 0.0818 0.55 270 0.3964 0.4754 0.0397 0.65 90 0.2367 0.4555 0.0338 0.65 270 0.7994 0.4555 0.0604 0.75 246 -0.3697 0.4216 0.0386 0.75 258 0.3092 0.4046 0.0362 0.75 270 0.6092 0.4021 0.05 0.85 126 0.3566 0.4604 0.038 0.85 138 0.3636 0.4503 0.0383 0.85 150 -0.1782 0.5565 0.0322 0.85 246 0.4584 0.4633 0.0425 0.85 258 -0.9513 0.3304 0.0693 0.95 114 2.2034 0.7787 0.1477 0.95 126 1.0612 0.8506 0.0758 0.95 150 -0.1921 0.6677 0.0325 0.95 162 -0.5104 0.7622 0.045 0.95 174 0.701 0.9402 0.0549 0.95 186 -0.1837 0.8767 0.0323