CLAS physics database search results Measurement E151M714 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_UL Stat. error Syst. error degrees 0.75 210 -0.4257 0.6394 0.0397 0.75 222 0.624 0.7708 0.0485 0.75 270 0.5426 0.6995 0.0447 0.85 198 0.4498 0.6736 0.0407 0.85 210 0.2671 0.7359 0.0342 0.85 222 -0.2893 0.6377 0.0348