CLAS physics database search results Measurement E151M399 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Data errors Systematic errors degrees 0.55 222 1.2625 0.6283 0.0837 0.65 126 1.0608 0.6562 0.0722 0.65 138 -1.0915 0.5889 0.0739 0.65 222 -0.1199 0.5888 0.0309 0.65 234 0.9181 0.5508 0.0643 0.65 246 -0.1866 0.4672 0.0321 0.75 126 -0.9762 0.4943 0.0675 0.75 138 -0.3685 0.6187 0.0377 0.75 222 0.4967 0.4671 0.043 0.75 246 0.397 0.6071 0.0388 0.85 234 -0.0708 0.4832 0.0303 0.85 246 -0.0421 0.5029 0.0301 0.85 258 0.995 0.5326 0.0685 0.95 270 0.2314 0.5358 0.0332 0.55 234 -0.5151 0.7351 0.0432 0.65 210 0.2651 0.9221 0.034 0.65 222 1.6956 1.2101 0.1064 0.65 234 -0.0979 0.7677 0.0306 0.65 246 -0.8779 0.5415 0.0608 0.75 138 -1.2045 0.5645 0.0785 0.75 258 0.4628 0.8598 0.0409 0.85 222 -0.7198 0.6052 0.0527 0.85 234 -0.1065 0.7302 0.0307 0.85 246 1.9411 0.9377 0.1207 0.85 258 0.2708 0.8354 0.0341 0.95 246 0.431 0.8979 0.0397 0.95 270 -0.2816 0.6932 0.0345