CLAS physics database search results Measurement E151M2165 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.45 282 0.5149 0.6017 0.0479 0.55 282 0.6122 0.6703 0.0536 0.55 294 -0.4242 0.5741 0.043 0.65 66 -0.102 0.7397 0.0309 0.65 282 0.4106 0.5652 0.0423 0.65 294 0.8475 0.6035 0.0684 0.75 66 -1.3952 0.5479 0.1055 0.75 78 0.0037 0.5894 0.03 0.75 90 -0.4026 0.688 0.0419 0.75 270 -0.1596 0.6934 0.0322 0.75 282 -0.5835 0.56 0.0519 0.75 294 0.7343 0.5455 0.0611 0.85 54 -1.2659 0.5524 0.0966 0.85 66 -0.4447 0.5984 0.044 0.85 78 -0.3838 0.6091 0.0409 0.85 90 0.3585 0.6523 0.0397 0.85 102 0.1989 0.6625 0.0333 0.85 294 -0.3868 0.6109 0.0411 0.95 42 0.2309 0.5406 0.0344 0.95 54 -0.0178 0.6429 0.03 0.95 66 -0.3948 0.5755 0.0415 0.95 78 -0.0066 0.6463 0.03 0.95 90 -0.6043 0.6253 0.0531