CLAS physics database search results Measurement E151M2397 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.55 186 -1.4082 1.0202 0.1064 0.55 210 -0.4162 1.1196 0.0426 0.65 138 0.0174 1.0592 0.03 0.65 186 -0.81 1.1378 0.066 0.65 198 -1.1307 0.858 0.0873 0.65 210 -0.7161 1.0249 0.06 0.75 102 1.1003 0.9243 0.0852 0.75 114 1.0312 0.955 0.0806 0.75 126 1.5987 1.1746 0.1197 0.75 198 -0.7074 0.996 0.0594 0.75 210 -0.7079 0.8638 0.0595 0.75 222 -0.2415 0.9142 0.0347 0.75 270 -0.2119 1.0166 0.0337 0.75 282 2.0897 0.8096 0.1545 0.85 90 0.4533 0.8586 0.0445 0.85 102 0.3705 0.7906 0.0403 0.85 114 1.0621 0.7244 0.0827 0.85 126 1.2328 0.9832 0.0943 0.85 174 -2.2084 0.863 0.1629 0.85 186 0.4735 0.8967 0.0456 0.85 198 -0.1436 0.7337 0.0318 0.85 210 1.2512 0.852 0.0956 0.85 222 -0.4126 0.7872 0.0424 0.85 234 0.2877 0.7971 0.0365 0.95 186 -0.5973 0.8881 0.0527 0.95 198 -0.1329 0.9003 0.0315 0.95 210 -1.0414 0.7863 0.0813 0.95 234 -1.1697 0.8603 0.09