CLAS physics database search results Measurement E151M1382 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.15 42 0.6036 0.9706 0.0744 0.35 54 0.0982 0.9941 0.032 0.55 234 0.1005 0.9072 0.0321 0.55 246 -0.4595 0.7706 0.0599 0.55 258 -0.6912 0.7193 0.0835 0.65 138 2.2647 0.9134 0.2572 0.65 234 -0.847 0.9389 0.1001 0.65 246 0.7096 0.8192 0.0855 0.65 258 -0.835 0.765 0.0988 0.65 270 -0.5099 0.7675 0.0649 0.75 150 0.3913 0.9464 0.0534 0.75 234 0.6017 0.7782 0.0742 0.75 246 -0.6055 0.6555 0.0746 0.75 258 0.5171 0.67 0.0656 0.75 270 -0.0631 0.7303 0.0308 0.85 234 -0.1223 0.8446 0.033 0.85 246 1.597 0.5304 0.1826 0.85 258 -0.0824 0.6632 0.0314 0.85 270 -0.1405 0.673 0.0339 0.85 282 -0.8673 0.7398 0.1023 0.95 258 -1.1403 0.6431 0.1321