CLAS physics database search results Measurement E151M1362 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.25 42 -1.2606 0.8305 0.1453 0.55 234 -0.2074 0.9218 0.038 0.55 246 -0.894 0.8738 0.1052 0.55 258 0.028 0.7431 0.0302 0.65 150 -1.6509 0.9188 0.1886 0.65 234 -1.4424 0.7469 0.1654 0.65 246 0.6614 0.7091 0.0804 0.65 258 0.0562 0.7247 0.0307 0.65 270 0.7372 0.7891 0.0884 0.75 138 2.0079 0.882 0.2284 0.75 150 -1.7875 0.82 0.2038 0.75 162 -0.018 0.9417 0.0301 0.75 174 0.6628 0.8821 0.0805 0.75 234 -1.0363 0.7646 0.1207 0.75 246 -1.1434 0.6574 0.1324 0.75 258 0.7673 0.6745 0.0916 0.75 270 -0.74 0.6615 0.0887 0.85 126 0.4174 0.9721 0.0558 0.85 138 0.6019 0.9397 0.0742 0.85 150 0.7248 0.9362 0.0871 0.85 162 0.9151 0.9607 0.1075 0.85 174 -0.6561 0.821 0.0799 0.85 234 0.22 0.7736 0.0389 0.85 246 -0.2202 0.6052 0.0389 0.85 258 0.9318 0.6306 0.1093 0.85 270 0.0405 0.536 0.0303 0.85 282 0.455 0.6586 0.0594 0.95 258 0.8753 0.5836 0.1032 0.95 270 1.9956 1.9956 0.2271