CLAS physics database search results Measurement E151M1799 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.35 66 -0.2589 0.8696 0.0339 0.35 78 0.007 0.9045 0.03 0.45 78 -0.7928 0.8092 0.0566 0.45 90 -0.3809 0.8337 0.0379 0.45 282 -0.172 0.8514 0.0318 0.45 294 1.3152 0.7488 0.0852 0.55 90 1.4101 0.7278 0.0906 0.65 114 0.1451 0.8207 0.0313 0.65 138 0.029 0.8807 0.0301 0.65 150 -1.2064 0.7977 0.079 0.65 222 0.3816 0.7849 0.0379 0.65 234 0.4183 0.7091 0.0393 0.65 246 -0.4192 0.7846 0.0393 0.75 114 -0.4734 0.8516 0.0415 0.75 126 1.2093 0.7362 0.0792 0.75 138 0.0191 0.8419 0.03 0.75 150 0.2536 0.873 0.0337 0.75 222 0.2036 0.7617 0.0324 0.75 234 -1.0771 0.5436 0.0718 0.75 246 -0.5546 0.6782 0.045 0.85 222 -0.142 0.6904 0.0312 0.85 234 0.0734 0.6934 0.0303 0.85 246 -0.5818 0.7459 0.0463