CLAS physics database search results Measurement E151M1621 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.55 222 -0.9061 0.9058 0.062 0.65 126 1.3265 0.8959 0.085 0.65 138 -1.415 0.7432 0.09 0.65 222 -0.5432 0.763 0.0443 0.65 234 -0.5172 0.7736 0.0431 0.65 246 -1.1788 0.5796 0.0768 0.75 126 -0.2401 0.665 0.0333 0.75 138 1.1949 0.77 0.0776 0.75 222 0.7457 0.6138 0.0538 0.75 246 0.5362 0.8055 0.044 0.85 234 -0.3654 0.6288 0.0371 0.85 246 -0.3819 0.6551 0.0377 0.85 258 -0.338 0.7718 0.0362 0.95 270 0.3846 0.6982 0.0378 0.55 234 -1.7678 0.5755 0.1071 0.65 210 0.2301 1.0208 0.0328 0.65 222 -0.1385 1.0792 0.0311 0.65 234 0.4065 0.9068 0.0382 0.65 246 -1.3437 0.7987 0.0837 0.75 138 0.4478 1.0087 0.0397 0.75 258 0.1277 0.9314 0.0309 0.85 222 -1.6027 0.5332 0.0979 0.85 234 -0.4492 0.9007 0.0398 0.85 246 1.9031 0.5825 0.1147 0.85 258 1.9073 0.5048 0.1149 0.95 246 1.0419 0.9135 0.0676 0.95 270 -0.3142 0.8824 0.0351