CLAS physics database search results Measurement E151M2399 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.55 114 -0.5731 1.0495 0.0513 0.75 90 -0.7528 1.1431 0.0623 0.75 102 0.1344 1.1511 0.0315 0.75 210 -0.5798 0.8705 0.0517 0.85 90 -0.3851 0.9574 0.041 0.85 102 0.4384 0.9848 0.0437 0.85 126 -0.5294 1.0334 0.0487 0.85 174 0.4378 1.0347 0.0437 0.85 186 -0.2875 0.8996 0.0365 0.85 198 -0.3518 0.8046 0.0394 0.85 210 0.1717 0.8647 0.0325 0.85 222 -0.0448 0.9257 0.0302 0.85 234 0.9783 0.8 0.077 0.95 186 -0.2092 0.9881 0.0336 0.95 198 -1.3606 0.9698 0.1031 0.95 210 0.9768 0.9078 0.0769 0.95 222 -0.5529 1.0354 0.0501