CLAS physics database search results Measurement E151M1604 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.65 234 -1.5987 0.8485 0.1004 0.65 246 0.8097 0.8014 0.0571 0.75 126 -0.7296 0.9284 0.053 0.75 234 1.3353 0.7994 0.0855 0.75 246 0.0145 0.7976 0.03 0.75 258 0.9826 0.7763 0.0661 0.75 270 0.0105 0.8381 0.03 0.85 126 -1.1336 0.8814 0.0743 0.85 138 -0.2555 0.8829 0.0337 0.85 246 -0.3565 0.9299 0.0368 0.85 258 -0.6476 0.7857 0.0491 0.85 270 -0.581 0.7612 0.046 0.95 246 1.2926 0.7733 0.0831 0.95 282 1.1228 0.706 0.0737 0.55 246 0.0423 1.1399 0.0301 0.65 234 2.4545 2.4545 0.1458 0.65 246 -0.4613 0.9619 0.0402 0.65 258 -1.3145 0.8464 0.0821 0.75 246 0.9749 1.0289 0.0641 0.75 258 2.4897 2.4897 0.1478 0.75 270 -1.3623 0.949 0.0847 0.85 234 -0.0198 1.0577 0.03 0.85 246 -0.297 0.8776 0.0346 0.85 258 0.8435 0.9625 0.0575 0.85 270 -0.3116 0.96 0.035 0.85 282 1.8545 0.7204 0.1119 0.95 270 -0.0821 0.8168 0.0304