CLAS physics database search results Measurement E151M1881 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.45 78 0.6001 0.9446 0.0471 0.45 282 0.7608 0.909 0.055 0.55 222 0.8554 0.8925 0.0599 0.55 270 0.7052 0.8073 0.0522 0.55 282 -0.1363 0.9335 0.0311 0.65 126 1.1609 0.8687 0.0765 0.65 150 1.0123 0.8747 0.0683 0.65 198 0.055 1.0071 0.0302 0.65 210 0.7609 0.9671 0.055 0.65 222 -0.7104 0.7255 0.0525 0.65 294 0.5606 0.7555 0.0453 0.75 126 -0.511 0.8484 0.0431 0.75 138 0.2778 0.8917 0.0344 0.75 210 1.2553 0.8756 0.0818 0.75 222 1.156 0.9119 0.0762 0.75 234 -1.1135 0.6409 0.0738 0.75 246 0.5195 0.9325 0.0435 0.75 270 0.5278 0.8609 0.0439 0.75 282 -0.885 0.6856 0.0614 0.75 294 0.1947 0.7126 0.0322 0.85 102 -0.6755 0.8443 0.0507 0.85 114 -1.46 0.8724 0.0934 0.85 210 -0.9162 0.8975 0.0631 0.85 222 0.6888 0.6348 0.0514 0.85 234 -2.6162 2.6162 0.1613 0.85 246 0.5328 0.7983 0.0441 0.95 234 0.3573 0.8743 0.037