CLAS physics database search results Measurement E151M1433 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.35 282 -0.168 0.6219 0.0316 0.45 282 0.3048 0.5758 0.0351 0.55 270 -0.5001 0.5763 0.0424 0.55 282 -0.4441 0.4557 0.0401 0.55 294 -0.094 0.6135 0.0305 0.65 282 -0.2758 0.5159 0.0343 0.75 270 -0.2092 0.5937 0.0325 0.85 90 0.0954 0.6347 0.0305 0.95 102 0.3769 0.5098 0.0376 0.95 114 -0.2833 0.4871 0.0345 0.95 150 0.1034 0.4542 0.0306 0.35 294 -1.1661 0.6418 0.0741 0.45 282 0.3612 0.8298 0.0366 0.45 294 0.1771 0.7642 0.0317 0.55 270 -0.2506 0.6992 0.0334 0.55 282 -0.6361 0.5626 0.0476 0.55 294 -0.0297 0.7637 0.03 0.65 282 -1.0662 0.4191 0.0689 0.65 294 -1.4237 0.3597 0.0881 0.75 270 1.6113 1.6113 0.0984 0.85 114 0.0165 0.9049 0.03 0.85 126 0.8437 0.6981 0.0575 0.95 102 -0.3507 0.6076 0.0363 0.95 114 0.11 0.7319 0.0307