CLAS physics database search results Measurement E151M1167 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.75 198 0.2982 1.0096 0.0371 0.85 78 -1.0154 0.7162 0.0801 0.85 102 3.2714 3.2714 0.241 0.85 186 -0.4354 0.9119 0.0437 0.85 198 1.0524 0.9241 0.0826 0.85 210 -0.2967 0.7464 0.037 0.85 222 0.1346 0.7967 0.0316 0.85 234 0.4265 0.796 0.0433 0.85 246 -0.8684 0.7612 0.0702 0.95 198 2.17 1.0622 0.1614 0.95 210 -1.0009 0.6313 0.0791 0.95 222 0.8874 0.8577 0.0715 0.95 234 -1.004 0.6589 0.0793 0.95 246 1.6514 0.8742 0.1244