CLAS physics database search results Measurement E151M1910 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.35 78 0.0069 0.8504 0.03 0.45 270 -0.9402 0.7815 0.0644 0.45 282 0.1593 0.7323 0.0315 0.55 222 -1.2193 0.7898 0.0797 0.65 126 -0.4793 0.8041 0.0418 0.65 138 -0.1542 0.8384 0.0314 0.65 210 1.3165 0.7527 0.0852 0.65 222 -0.5916 0.762 0.0467 0.65 282 0.0254 0.6525 0.03 0.75 66 0.122 0.8507 0.0309 0.75 114 1.1031 0.783 0.0733 0.75 198 0.597 0.8752 0.047 0.75 210 -0.3678 0.65 0.0374 0.75 222 -0.8612 0.7581 0.0602 0.75 270 0.0815 0.762 0.0304 0.75 282 -0.0232 0.6817 0.03 0.75 294 -0.7008 0.7787 0.052 0.85 114 -1.1599 0.6535 0.0764 0.85 126 -1.02 0.6219 0.0687 0.85 198 -1.5759 0.6753 0.1001 0.85 210 -0.9018 0.6576 0.0623 0.85 222 -0.298 0.8215 0.035 0.85 234 0.2736 0.6617 0.0343