CLAS physics database search results Measurement E151M1827 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.45 282 0.1402 0.8456 0.0312 0.55 114 -1.1966 0.7829 0.0785 0.65 90 -0.5418 0.8738 0.0445 0.65 102 1.1562 0.6928 0.0762 0.65 114 0.9727 0.8662 0.0661 0.65 246 -1.5665 0.7163 0.0995 0.65 258 -0.5987 0.7261 0.0471 0.75 90 -1.7502 0.7805 0.1102 0.75 102 1.8015 0.6862 0.1132 0.75 114 0.8335 0.7818 0.0587 0.75 126 0.4238 0.8516 0.0395 0.75 246 0.0938 0.8364 0.0305 0.75 258 -1.0137 0.6865 0.0684 0.75 270 1.3095 0.6588 0.0848 0.85 114 -0.6525 0.7081 0.0496 0.85 234 0.4512 0.7123 0.0406 0.85 246 0.4431 0.6288 0.0403 0.85 258 -0.1497 0.6893 0.0313 0.85 270 -0.5979 0.7289 0.047 0.85 282 -0.4006 0.747 0.0386 0.95 246 -0.9095 0.6237 0.0627 0.95 258 0.4216 0.6144 0.0394 0.95 270 0.5095 0.6773 0.043 0.95 282 0.2588 0.6084 0.0339 0.95 294 0.5422 0.6889 0.0445