CLAS physics database search results Measurement E151M2364 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.45 270 -0.2301 1.0465 0.0343 0.45 282 -0.7258 0.974 0.0606 0.55 90 0.1932 0.9594 0.0331 0.55 102 -0.4815 0.934 0.046 0.65 102 0.1235 0.8602 0.0313 0.65 114 0.495 0.8987 0.0468 0.65 198 -0.2708 1.0831 0.0359 0.65 294 -0.151 0.8475 0.0319 0.75 78 0.4393 0.9009 0.0438 0.75 126 0.4283 1.0121 0.0432 0.75 198 0.4398 1.0142 0.0438 0.75 210 0.4788 1.0277 0.0459 0.75 222 0.2547 0.9974 0.0352 0.75 234 -0.3308 0.8723 0.0384 0.75 246 1.0865 0.9152 0.0843 0.85 66 -0.3184 0.9094 0.0379 0.85 78 0.1558 0.7513 0.0321 0.85 90 -0.8361 0.8362 0.0676 0.85 102 0.9489 0.8087 0.0751 0.85 186 -0.0403 0.9528 0.0301 0.85 198 -0.6905 0.7361 0.0584 0.85 210 -0.2821 0.8106 0.0363 0.85 222 -1.4085 0.7134 0.1065 0.85 234 0.7386 0.8083 0.0614 0.85 246 -1.8283 0.7114 0.1359 0.85 258 -0.7089 0.8625 0.0595 0.95 114 1.208 0.8708 0.0926 0.95 174 -0.7701 0.8919 0.0634 0.95 186 1.5322 0.8522 0.1151 0.95 198 0.9775 0.757 0.077 0.95 210 -0.5891 0.7021 0.0522 0.95 222 -1.3404 0.5974 0.1017 0.95 234 -0.7844 0.6393 0.0643 0.95 246 -0.6562 0.6388 0.0562 0.95 258 1.0233 0.8299 0.08 0.95 270 0.3036 0.7035 0.0372