CLAS physics database search results Measurement E151M1094 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.55 102 0.2066 0.9384 0.0336 0.65 90 -0.2162 0.8663 0.0339 0.65 102 0.5136 0.9259 0.0481 0.65 246 1.5568 0.9614 0.1177 0.75 102 -0.2494 0.7666 0.0351 0.75 234 0.4891 0.9687 0.0467 0.75 246 0.8875 0.8654 0.0715 0.85 54 1.0453 0.8927 0.0821 0.85 66 -0.2481 0.7046 0.0351 0.85 222 -0.3842 0.8155 0.0411 0.85 234 0.5066 0.8211 0.0477 0.85 246 1.8223 0.8665 0.1365 0.85 258 -0.6202 0.5515 0.0544 0.85 270 0.9131 0.7792 0.0732 0.85 282 1.0848 0.9418 0.0848 0.95 246 0.4382 0.8797 0.0439 0.95 258 1.3697 0.9462 0.1045 0.95 270 0.4102 0.7071 0.0424 0.95 282 -0.878 0.6177 0.0708 0.95 294 0.0957 0.6698 0.0308 0.95 306 -0.5689 0.5485 0.0513 0.95 318 0.3719 0.7183 0.0405