CLAS physics database search results Measurement E151M1750 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.65 270 -1.7488 0.4947 0.1101 0.65 282 1.2965 0.6477 0.0841 0.75 90 1.07 0.6696 0.0714 0.75 102 0.1472 0.6196 0.0313 0.75 258 -0.0781 0.6335 0.0304 0.75 270 0.0412 0.6971 0.0301 0.75 282 -0.1683 0.7129 0.0317 0.75 294 0.9683 0.5243 0.0659 0.85 78 -0.4546 0.5349 0.0407 0.85 90 0.7465 0.5854 0.0543 0.85 102 -0.1534 0.6447 0.0314 0.85 114 0.2685 0.6917 0.0341 0.85 126 -0.443 0.7203 0.0403 0.85 234 0.7061 0.6162 0.0523 0.85 246 -0.1492 0.7795 0.0313 0.85 258 0.2665 0.5462 0.0341 0.85 270 0.4962 0.6702 0.0425 0.85 282 -0.0174 0.6263 0.03 0.85 294 0.6566 0.6779 0.0498 0.85 306 -0.4867 0.5806 0.0421 0.95 90 -0.2235 0.6677 0.0329 0.95 102 -0.2986 0.6355 0.035 0.95 114 0.0152 0.7918 0.03 0.95 126 1.277 0.6064 0.083 0.95 246 0.2643 0.6661 0.034 0.95 270 -0.3532 0.5321 0.0369 0.95 282 0.8902 0.5511 0.0617 0.95 294 0.1495 0.5466 0.0313 0.95 306 0.99 0.5907 0.0671