CLAS physics database search results Measurement E151M1859 EG4 Xiaochao Zheng 2016 cos(theta_pi+) phi(pi+) A_LL Stat. error Syst. error degrees 0.35 78 -1.0117 0.8146 0.0683 0.35 270 0.8114 0.8219 0.0576 0.35 282 0.1842 0.8145 0.032 0.45 78 -0.717 0.8627 0.0528 0.45 270 -0.8497 0.8692 0.0596 0.55 90 -0.8433 0.9617 0.0593 0.55 138 -0.3318 1.0213 0.0361 0.55 222 0.4852 0.8542 0.042 0.55 270 -0.9578 0.8757 0.0653 0.55 282 0.3159 0.7991 0.0356 0.65 126 -1.1023 0.8917 0.0732 0.65 138 -0.5954 0.6753 0.0469 0.65 198 -1.1171 0.8731 0.074 0.65 210 -0.2495 0.7201 0.0336 0.65 222 0.5434 0.7815 0.0445 0.65 270 0.9617 0.8143 0.0655 0.75 78 0.1917 0.8836 0.0322 0.75 126 2.184 0.7813 0.1357 0.75 138 0.1479 0.8667 0.0313 0.75 210 -0.807 0.7114 0.0574 0.75 222 -0.4183 0.8433 0.0393 0.75 234 -0.3524 0.8044 0.0368 0.75 270 -0.1556 0.9039 0.0314 0.75 282 -0.4891 0.7756 0.0422 0.85 114 -0.2051 0.8498 0.0325 0.85 126 -0.6342 0.8408 0.0488 0.85 210 1.1274 0.6793 0.0746 0.85 222 1.5964 0.7803 0.1013 0.85 234 -0.9342 0.7051 0.0641