CLAS physics database search results Measurement E151M1869 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.65 102 0.4507 0.8575 0.0406 0.65 126 0.8924 0.9569 0.0618 0.65 138 0.4826 0.9843 0.0419 0.75 102 0.3091 0.8738 0.0354 0.75 114 -1.3837 0.798 0.0891 0.75 126 1.6141 0.7988 0.1023 0.75 138 -1.5248 0.7985 0.0971 0.75 210 0.4124 0.8952 0.039 0.75 222 -1.0385 0.934 0.0697 0.75 234 1.9919 0.7588 0.1244 0.75 246 -0.6693 0.7776 0.0504 0.75 294 0.1321 0.8534 0.031 0.85 78 -1.1215 0.8837 0.0743 0.85 90 0.9507 0.8739 0.065 0.85 102 -0.31 0.9834 0.0354 0.85 222 0.4874 0.8346 0.0421 0.85 234 1.0403 0.6535 0.0698 0.85 246 -0.4614 0.8602 0.041 0.95 90 -0.6702 0.8334 0.0505 0.95 222 0.7045 0.78 0.0522 0.95 234 -0.7954 0.7602 0.0568 0.95 246 -0.2167 0.6911 0.0327 0.95 258 -0.2458 0.8044 0.0335 0.95 270 1.2528 0.647 0.0816