CLAS physics database search results Measurement E151M2427 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.75 114 1.3784 0.9984 0.1044 0.75 270 0.473 0.9242 0.0456 0.85 102 0.3571 1.0094 0.0396 0.85 114 0.271 0.9233 0.0359 0.85 126 -1.0899 1.0065 0.0845 0.85 186 0.3997 1.1098 0.0417 0.85 198 -0.7961 0.8553 0.0651 0.85 210 -1.2311 0.9468 0.0942