CLAS physics database search results Measurement E151M1456 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.65 234 -0.6043 0.7372 0.0462 0.65 246 0.2402 0.5995 0.0331 0.65 258 -0.0234 0.6684 0.03 0.65 270 0.4607 0.6966 0.0402 0.75 162 -1.1469 0.6722 0.0731 0.75 234 1.1484 0.733 0.0732 0.75 246 0.0721 0.6377 0.0303 0.75 258 0.0045 0.6176 0.03 0.75 270 -0.6747 0.5937 0.0494 0.85 162 -0.5605 0.8401 0.0443 0.85 234 0.7683 0.7088 0.0538 0.85 246 -0.5088 0.7227 0.0421 0.85 258 -0.9536 0.6713 0.063 0.55 246 0.1577 0.6786 0.0315 0.55 258 0.303 0.6743 0.0351 0.65 234 1.5526 0.5556 0.0978 0.65 246 0.3659 0.4889 0.0372 0.65 258 -0.3692 0.4543 0.0373 0.65 270 -0.6166 0.5566 0.0476 0.75 150 -0.3033 0.6271 0.0351 0.75 234 0.2245 0.6934 0.0329 0.75 246 0.3774 0.5102 0.0376 0.75 258 0.2335 0.555 0.0331 0.75 270 0.5812 0.4744 0.046 0.85 234 -0.2902 0.649 0.0347 0.85 246 0.4355 0.577 0.0398 0.85 258 -0.2258 0.5247 0.0329