CLAS physics database search results Measurement E151M1400 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.15 42 -0.7645 0.9258 0.0913 0.25 54 -0.3714 0.967 0.0515 0.35 42 1.052 0.8085 0.1224 0.45 30 1.7532 0.8403 0.2 0.45 42 0.3673 0.8419 0.0511 0.45 54 -0.0286 0.9004 0.0302 0.45 234 -0.2439 0.8548 0.0407 0.45 258 -0.26 0.9032 0.042 0.55 222 -1.803 0.7077 0.2056 0.55 234 0.9241 0.6456 0.1085 0.55 246 -0.564 0.6767 0.0703 0.55 258 0.312 0.8096 0.0462 0.55 270 -0.0141 0.864 0.03 0.65 150 1.9749 0.7261 0.2248 0.65 162 1.0008 0.8848 0.1168 0.65 222 0.5691 0.7838 0.0709 0.65 234 0.1348 0.7514 0.0336 0.65 246 -1.1364 0.6638 0.1316 0.65 258 0.7551 0.6866 0.0903 0.65 270 -0.9338 0.8037 0.1095 0.75 138 -1.2046 0.7769 0.1391 0.75 174 -0.3149 0.8783 0.0465 0.75 222 -1.0917 0.7759 0.1267 0.75 234 0.0593 0.7329 0.0307 0.75 246 -0.6932 0.5535 0.0837 0.75 258 -0.2336 0.6518 0.0399 0.75 270 0.5668 0.7207 0.0706 0.85 234 -0.4942 0.7531 0.0633 0.85 246 -0.3378 0.6045 0.0485 0.85 258 -0.1622 0.5464 0.0351 0.85 270 1.4384 0.5763 0.165 0.95 138 1.2328 0.6637 0.1422