CLAS physics database search results Measurement E151M2376 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.65 114 -0.345 1.0546 0.0391 0.65 126 0.8241 1.1024 0.0669 0.75 90 0.5064 1.003 0.0474 0.75 186 0.7792 0.9872 0.064 0.75 198 0.3727 0.962 0.0404 0.75 234 -0.5217 0.9191 0.0483 0.75 294 1.1458 0.9045 0.0883 0.85 78 0.392 0.8473 0.0413 0.85 90 -1.0303 0.7172 0.0805 0.85 102 -0.6785 0.8704 0.0576 0.85 114 -0.7576 0.9881 0.0626 0.85 186 -0.5693 1.0755 0.051 0.85 198 -0.2597 0.8382 0.0354 0.85 210 -0.8556 0.7892 0.0689 0.85 222 0.7137 0.7714 0.0598 0.85 234 -2.3373 0.7284 0.1721 0.85 246 -1.1844 0.9358 0.091 0.95 174 -0.7741 0.8384 0.0636 0.95 198 -0.2645 0.9624 0.0356 0.95 210 -0.9271 0.9093 0.0736 0.95 222 0.073 0.8499 0.0305 0.95 234 0.7666 0.6593 0.0632 0.95 246 -0.3126 0.8737 0.0376 0.95 270 -2.3465 0.7268 0.1728