CLAS physics database search results Measurement E151M895 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.65 198 -0.2191 0.7782 0.0362 0.75 66 0.9694 0.9146 0.0944 0.75 210 1.5491 0.7976 0.1461 0.75 222 1.2339 0.7711 0.1178 0.75 270 -0.404 0.6265 0.0479 0.75 282 0.1093 0.6486 0.0317 0.85 114 -0.822 0.8012 0.0816 0.85 210 -0.2297 0.8665 0.0367 0.85 222 1.3271 0.9442 0.1261 0.85 234 -0.6704 0.7742 0.0688 0.45 126 -0.5163 0.6563 0.0453 0.45 282 1.4555 0.6732 0.1001 0.55 78 -0.1639 0.6792 0.0319 0.55 138 -0.1771 0.7531 0.0322 0.55 210 0.6937 0.8709 0.0545 0.65 198 1.0698 0.8938 0.0763 0.75 210 0.0529 0.84 0.0302 0.75 222 -0.5173 0.6908 0.0453 0.75 282 0.0171 0.6707 0.03 0.75 294 0.2981 0.7117 0.0358 0.85 102 -0.5214 0.713 0.0455 0.85 114 -0.5117 0.7344 0.045 0.85 210 1.9031 0.9045 0.1284