CLAS physics database search results Measurement E151M1368 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.35 42 -2.2554 0.804 0.2561 0.35 54 -0.0327 0.9459 0.0302 0.45 42 -0.6325 0.8567 0.0774 0.45 54 -1.0652 0.631 0.1238 0.45 222 1.0926 0.8071 0.1268 0.45 234 -1.3564 0.7906 0.1559 0.55 18 -1.1202 0.8684 0.1299 0.55 30 -1.1385 0.8603 0.1319 0.55 42 -0.1583 0.8158 0.0349 0.55 54 -0.7095 0.823 0.0855 0.55 222 -0.5495 0.7989 0.0689 0.55 234 0.5224 0.7242 0.0661 0.55 246 -0.0078 0.8918 0.03 0.65 42 0.1166 0.9714 0.0328 0.65 54 -0.9671 0.7902 0.1131 0.65 150 -1.8333 0.9455 0.2089 0.65 174 0.1242 0.9437 0.0331 0.65 222 -1.4829 0.6466 0.1699 0.65 234 0.9018 0.5697 0.106 0.65 246 -0.616 0.7853 0.0757 0.75 222 -0.0264 0.895 0.0301 0.75 234 0.2829 0.7011 0.0438 0.75 246 0.5143 0.6277 0.0653 0.85 210 1.7114 0.833 0.1953 0.85 222 -0.4969 0.6982 0.0636 0.85 234 -0.4371 0.805 0.0577 0.85 246 -0.6328 0.6373 0.0774