CLAS physics database search results Measurement E151M1637 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.55 138 -0.0297 0.8863 0.0301 0.55 234 1.4357 0.8 0.0911 0.65 162 -0.6207 0.78 0.0478 0.65 210 -0.6795 0.7831 0.0506 0.65 222 -1.2366 0.793 0.08 0.65 234 -0.1084 0.7634 0.0307 0.65 246 0.9652 0.7416 0.0652 0.75 150 -0.8096 0.8924 0.057 0.75 210 -4.0129 4.0129 0.2424 0.75 222 1.9378 0.8122 0.12 0.75 246 0.3631 0.7652 0.0371 0.75 258 -0.0426 0.8137 0.0301 0.85 234 0.2764 0.8914 0.0343 0.85 246 1.9227 0.6943 0.1191 0.85 258 1.3959 0.615 0.0889 0.95 114 0.5749 0.7728 0.0457 0.95 126 -0.0041 0.706 0.03 0.45 246 -1.0422 1.0514 0.0676 0.55 222 -0.6955 1.1846 0.0504 0.55 234 -0.0549 1.0828 0.0302 0.55 258 -2.2124 0.7886 0.1321 0.65 150 0.8195 1.1089 0.0563 0.65 162 0.8816 1.217 0.0594 0.65 210 1.4847 0.941 0.0914 0.65 222 -0.382 1.113 0.0373 0.65 234 0.2421 1.0791 0.0331 0.65 246 -0.0256 0.9492 0.03 0.75 150 0.0027 1.1752 0.03 0.75 222 -0.8929 0.9107 0.06 0.75 246 0.3362 1.0801 0.0358 0.75 258 -0.2105 1.1374 0.0324 0.85 222 -0.5247 1.2041 0.0428 0.85 234 0.4486 0.9866 0.0398 0.85 246 0.1071 0.9012 0.0306 0.85 258 1.8 0.6475 0.1089 0.95 234 0.2251 0.9854 0.0327