CLAS physics database search results Measurement E151M1363 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.55 246 -0.9426 0.7487 0.1105 0.55 258 0.1539 0.9753 0.0347 0.55 270 -0.738 0.7732 0.0885 0.65 138 0.1868 1.0647 0.0367 0.65 246 1.0323 0.6821 0.1202 0.65 258 -0.3647 0.7449 0.0509 0.65 270 -0.6413 0.746 0.0783 0.75 138 -0.8028 0.9492 0.0954 0.75 186 -1.5752 0.8644 0.1802 0.75 222 -0.2762 0.8917 0.0432 0.75 234 -0.1076 0.7837 0.0324 0.75 246 1.2335 0.8257 0.1423 0.75 258 0.7405 0.7028 0.0887 0.75 270 0.3089 0.7275 0.046 0.85 126 -0.9975 0.8804 0.1164 0.85 138 1.251 0.858 0.1443 0.85 162 1.4434 0.7687 0.1655 0.85 234 0.4897 0.7846 0.0629 0.85 246 -0.6949 0.8491 0.0839 0.85 258 -0.3979 0.6563 0.054 0.85 270 -0.373 0.6269 0.0517 0.85 282 0.566 0.7652 0.0705 0.95 162 0.6253 0.7613 0.0766 0.95 258 0.7338 0.684 0.088