CLAS physics database search results Measurement E151M2163 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.35 66 -0.2593 0.6787 0.0354 0.45 282 -0.7269 0.7225 0.0606 0.55 282 0.0579 0.5605 0.0303 0.65 270 -0.3999 0.7679 0.0417 0.65 282 -0.6658 0.5115 0.0568 0.65 294 0.4406 0.5559 0.0438 0.75 66 0.2868 0.6799 0.0365 0.75 78 0.8547 0.7456 0.0689 0.75 90 -0.1415 0.6884 0.0317 0.75 258 0.0049 0.7959 0.03 0.75 270 0.6456 0.6131 0.0556 0.75 282 0.5932 0.497 0.0524 0.75 294 -0.1412 0.6006 0.0317 0.85 66 0.765 0.481 0.0631 0.85 78 0.5968 0.5533 0.0527 0.85 90 0.1766 0.5073 0.0326 0.85 102 -0.1582 0.5439 0.0321 0.85 114 0.4699 0.8238 0.0454 0.85 258 0.5269 0.7797 0.0486 0.85 270 -0.1599 0.6801 0.0322 0.85 282 -0.4762 0.5502 0.0457 0.85 294 -1.0576 0.661 0.0824 0.95 54 0.4661 0.567 0.0452 0.95 66 0.4603 0.5257 0.0449 0.95 78 0.0685 0.5924 0.0304 0.95 90 0.6821 0.5341 0.0578 0.95 102 -0.1403 0.6359 0.0317 0.95 114 0.238 0.5563 0.0346 0.95 126 0.8819 0.5923 0.0706