CLAS physics database search results Measurement E151M946 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.45 282 0.0102 0.6543 0.03 0.55 282 0.536 0.6366 0.0493 0.55 294 0.0843 0.6528 0.0306 0.75 90 -0.4373 0.5922 0.0438 0.75 270 0.4669 0.7398 0.0454 0.75 294 1.2017 0.7225 0.0928 0.85 66 1.3047 0.7437 0.1 0.85 78 0.4056 0.7021 0.0422