CLAS physics database search results Measurement E151M2144 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.45 270 0.4554 0.6608 0.0422 0.65 78 -0.2125 0.6674 0.033 0.65 126 -0.4311 0.6309 0.0411 0.65 210 -0.2877 0.7919 0.0354 0.75 210 0.1136 0.7537 0.0309 0.75 234 0.5824 0.7836 0.0483 0.75 270 -0.0715 0.67 0.0304 0.75 282 0.9855 0.617 0.0708 0.85 102 0.2295 0.7345 0.0335 0.85 114 0.2924 0.6739 0.0355 0.85 126 -0.36 0.7958 0.0381 0.85 210 -0.3143 0.8222 0.0363 0.85 222 -0.4544 0.7338 0.0421 0.45 282 -1.6434 1.5394 0.154 0.65 126 -2.7758 1.8634 0.2569 0.65 198 -2.4291 2.006 0.2252 0.75 210 -4.078 1.8105 0.376 0.75 234 -2.8284 1.7961 0.2617 0.75 270 -3.0523 1.6908 0.2821 0.75 282 -0.978 1.4297 0.0948 0.75 294 1.9244 1.7548 0.1794 0.85 102 0.9253 2.3084 0.0902 0.85 114 -0.1472 2.1049 0.0329 0.85 210 -6.1845 6.1845 0.5692