CLAS physics database search results Measurement E151M999 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.65 78 0.0931 0.7348 0.0308 0.65 90 -0.6474 0.6589 0.056 0.65 102 -0.2405 0.753 0.0348 0.65 258 -0.3161 0.6742 0.0379 0.65 282 1.0976 0.8123 0.0856 0.75 78 -0.1401 0.6573 0.0317 0.75 90 -0.2865 0.6416 0.0366 0.75 102 0.4746 0.7962 0.0459 0.75 246 0.2159 0.7695 0.0339 0.75 258 -0.4444 0.5795 0.0442 0.75 270 0.379 0.7024 0.0408 0.75 282 -0.1152 0.6976 0.0312 0.75 294 -0.1644 0.696 0.0323 0.85 78 0.3948 0.7654 0.0416 0.85 102 -0.1919 0.7267 0.0331 0.85 246 0.5377 0.6963 0.0494 0.85 258 -0.1371 0.5102 0.0316 0.85 270 2.0678 0.6761 0.1541 0.85 282 0.5772 0.7137 0.0518 0.85 294 0.7992 0.8194 0.0657 0.85 306 1.0895 0.7746 0.0851 0.85 318 -0.4844 0.6374 0.0464 0.95 246 1.0234 0.7718 0.0806 0.95 270 -0.9418 0.4866 0.0751 0.95 282 -0.3456 0.5965 0.0392 0.95 294 -1.2145 0.4599 0.0937