CLAS physics database search results Measurement E151M1882 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.35 270 -0.9689 0.8601 0.0659 0.65 114 -0.9506 0.8612 0.0649 0.65 126 0.4536 0.8582 0.0407 0.65 138 -1.0555 0.9238 0.0706 0.65 210 -0.6361 0.8349 0.0488 0.65 222 0.9484 0.84 0.0648 0.65 282 0.4169 0.893 0.0392 0.65 294 0.0077 0.9453 0.03 0.75 114 0.3765 0.898 0.0377 0.75 126 0.009 0.9421 0.03 0.75 138 -0.1603 0.9272 0.0315 0.75 210 -1.5129 0.8012 0.0965 0.75 222 0.8017 0.7478 0.0571 0.75 234 -0.2508 0.8502 0.0336 0.75 282 0.7819 0.7564 0.0561 0.75 294 -0.9726 0.7304 0.0661 0.85 102 -0.118 0.7893 0.0308 0.85 114 0.2955 0.8507 0.0349 0.85 210 -0.125 0.7183 0.0309 0.85 222 -1.5351 0.6175 0.0977 0.85 234 0.0887 0.6698 0.0305 0.85 246 -0.5817 0.7176 0.0463 0.95 126 -1.3293 0.718 0.086 0.95 234 0.8542 0.7798 0.0598 0.95 246 1.1358 0.7077 0.0751